Classifications

• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D507/00—Heterocyclic compounds containing a condensed beta-lactam ring system, not provided for by groups C07D463/00, C07D477/00 or C07D499/00 - C07D505/00; Such ring systems being further condensed
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K31/00—Medicinal preparations containing organic active ingredients
  • A61K31/33—Heterocyclic compounds
  • A61K31/395—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins
  • A61K31/535—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having six-membered rings with at least one nitrogen and one oxygen as the ring hetero atoms, e.g. 1,2-oxazines
  • A61K31/5365—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having six-membered rings with at least one nitrogen and one oxygen as the ring hetero atoms, e.g. 1,2-oxazines ortho- or peri-condensed with heterocyclic ring systems
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K47/00—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient
  • A61K47/50—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates
  • A61K47/51—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent
  • A61K47/68—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent the modifying agent being an antibody, an immunoglobulin or a fragment thereof, e.g. an Fc-fragment
  • A61K47/6801—Drug-antibody or immunoglobulin conjugates defined by the pharmacologically or therapeutically active agent
  • A61K47/6803—Drugs conjugated to an antibody or immunoglobulin, e.g. cisplatin-antibody conjugates
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K47/00—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient
  • A61K47/50—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates
  • A61K47/51—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent
  • A61K47/68—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent the modifying agent being an antibody, an immunoglobulin or a fragment thereof, e.g. an Fc-fragment
  • A61K47/6801—Drug-antibody or immunoglobulin conjugates defined by the pharmacologically or therapeutically active agent
  • A61K47/6803—Drugs conjugated to an antibody or immunoglobulin, e.g. cisplatin-antibody conjugates
  • A61K47/68033—Drugs conjugated to an antibody or immunoglobulin, e.g. cisplatin-antibody conjugates the drug being a maytansine
• • A—HUMAN NECESSITIES
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  • A61K47/00—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient
  • A61K47/50—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates
  • A61K47/51—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent
  • A61K47/68—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent the modifying agent being an antibody, an immunoglobulin or a fragment thereof, e.g. an Fc-fragment
  • A61K47/6835—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent the modifying agent being an antibody, an immunoglobulin or a fragment thereof, e.g. an Fc-fragment the modifying agent being an antibody or an immunoglobulin bearing at least one antigen-binding site
  • A61K47/6849—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent the modifying agent being an antibody, an immunoglobulin or a fragment thereof, e.g. an Fc-fragment the modifying agent being an antibody or an immunoglobulin bearing at least one antigen-binding site the antibody targeting a receptor, a cell surface antigen or a cell surface determinant
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K47/00—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient
  • A61K47/50—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates
  • A61K47/51—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent
  • A61K47/68—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent the modifying agent being an antibody, an immunoglobulin or a fragment thereof, e.g. an Fc-fragment
  • A61K47/6835—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent the modifying agent being an antibody, an immunoglobulin or a fragment thereof, e.g. an Fc-fragment the modifying agent being an antibody or an immunoglobulin bearing at least one antigen-binding site
  • A61K47/6851—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent the modifying agent being an antibody, an immunoglobulin or a fragment thereof, e.g. an Fc-fragment the modifying agent being an antibody or an immunoglobulin bearing at least one antigen-binding site the antibody targeting a determinant of a tumour cell
  • A61K47/6855—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent the modifying agent being an antibody, an immunoglobulin or a fragment thereof, e.g. an Fc-fragment the modifying agent being an antibody or an immunoglobulin bearing at least one antigen-binding site the antibody targeting a determinant of a tumour cell the tumour determinant being from breast cancer cell
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K47/00—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient
  • A61K47/50—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates
  • A61K47/51—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent
  • A61K47/68—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent the modifying agent being an antibody, an immunoglobulin or a fragment thereof, e.g. an Fc-fragment
  • A61K47/6835—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent the modifying agent being an antibody, an immunoglobulin or a fragment thereof, e.g. an Fc-fragment the modifying agent being an antibody or an immunoglobulin bearing at least one antigen-binding site
  • A61K47/6851—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent the modifying agent being an antibody, an immunoglobulin or a fragment thereof, e.g. an Fc-fragment the modifying agent being an antibody or an immunoglobulin bearing at least one antigen-binding site the antibody targeting a determinant of a tumour cell
  • A61K47/6869—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent the modifying agent being an antibody, an immunoglobulin or a fragment thereof, e.g. an Fc-fragment the modifying agent being an antibody or an immunoglobulin bearing at least one antigen-binding site the antibody targeting a determinant of a tumour cell the tumour determinant being from a cell of the reproductive system: ovaria, uterus, testes, prostate
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K47/00—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient
  • A61K47/50—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates
  • A61K47/51—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent
  • A61K47/68—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent the modifying agent being an antibody, an immunoglobulin or a fragment thereof, e.g. an Fc-fragment
  • A61K47/6835—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent the modifying agent being an antibody, an immunoglobulin or a fragment thereof, e.g. an Fc-fragment the modifying agent being an antibody or an immunoglobulin bearing at least one antigen-binding site
  • A61K47/6871—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent the modifying agent being an antibody, an immunoglobulin or a fragment thereof, e.g. an Fc-fragment the modifying agent being an antibody or an immunoglobulin bearing at least one antigen-binding site the antibody targeting an enzyme
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P19/00—Drugs for skeletal disorders
  • A61P19/08—Drugs for skeletal disorders for bone diseases, e.g. rachitism, Paget's disease
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P25/00—Drugs for disorders of the nervous system
  • A61P25/28—Drugs for disorders of the nervous system for treating neurodegenerative disorders of the central nervous system, e.g. nootropic agents, cognition enhancers, drugs for treating Alzheimer's disease or other forms of dementia
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P31/00—Antiinfectives, i.e. antibiotics, antiseptics, chemotherapeutics
  • A61P31/04—Antibacterial agents
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P35/00—Antineoplastic agents
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P43/00—Drugs for specific purposes, not provided for in groups A61P1/00-A61P41/00
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P9/00—Drugs for disorders of the cardiovascular system

Definitions

• Conjugates wherein the Ligand is connected to the Biologically Active Molecule through a linker compound.
• the present disclosure also provides conjugate compounds in
• compositions for use in various therapeutic applications are provided.
• Proliferative diseases are characterized by uncontrolled growth and spread of abnormal cells. If the spread is not controlled, it can result in death.
• Abnormal proliferation for example, cancer, is caused by both external factors (e.g., tobacco, chemicals, radiation and infectious organisms) and internal factors (inherited mutations, immune system conditions, the mutations that occur from metabolism). These causal factors may act together or in sequence to initiate or promote abnormal proliferation. Cancer is treated by surgery, radiation, chemotherapy, hormones and immunotherapy. However, there is a need for more effective anti-proliferation drugs.
• the ideal anti-proliferation therapy would enable targeted delivery of highly cytotoxic agents to tumor cells and would leave normal cells unaffected.
• Conventional chemotherapeutic treatment with maytansine for example, is limited because of the toxic side-effects that arise from effects of the drug on non-cancerous cells.
• Various approaches to targeted drug delivery have been tried, including the use of conjugates of tumor targeted probes (such as antibodies or growth factors) with toxins such as pseudomonas or diphtheria toxins, which arrest the synthesis of proteins and cells.
• the side effects include reaction of the immune system due to non-human components of the conjugates.
• the half-life of the drug conjugates were limited due to elimination from the circulation through renal filtration, and schematic degradation, uptake by the reticuloendothelial system (RES), and accumulation in non-targeted organs and tissues.
• RES reticuloendothelial system
• Another approach uses passive drug carriers such as polymers, liposomes, and polymeric micelles to take advantage of the hyper-permeability of vascular endothelia of tumor tissue.
• Polymeric drugs and macromolecules accumulate within solid tumors due to an enhanced permeability and retention mechanism.
• barriers of using such targeted deliveries include fast clearance of foreign particles from the blood, and technological hindrances in obtaining highly standardized, pharmaceutically acceptable drug delivery systems with the necessary specificity and selectivity for binding tumor cells.
• L is absent or a ligand
• L when L is a ligand, L is capable of binding to a cell or cell population;
• a is an integer from 1 to 10;
• Z2 and Zi are each independently absent or a spacer
• D is a Biologically Active Molecule
• A is a natural or non-natural amino acid, or a peptide comprising 2-20 amino acids;
• W is absent, -0-, -S-, -CR5R6-, -NR4-;
• R4, K5, and Re are each independently H, or a substituted or unsubstituted: alkyl, alkenyl, alkynyl, aryl, heteroaryl, or heterocyclyl;
• X is absent, aryl, heteroaryl, cycloalkyl, heterocyclyl, wherein aryl, heteroaryl, cycloalkyl, and heterocyclyl are optionally substituted;
• Y is absent, or a spacer.
• linker-biologically active compounds represented by the following structural formula (V):
• Z2 and Zi are each independently absent or a spacer
• D is a Biologically Active Molecule
• A is a natural or non-natural amino acid, or a peptide comprising 2-20 amino acids
• W is absent, -0-, -S-, -CR 5 R ⁇ i-, -NR4-;
• R4, R5, and R are each independently H, or a substituted or unsubstituted: alkyl, alkenyl, alkynyl, aryl, heteroaryl, or heterocyclyl;
• X is absent, aryl, heteroaryl, cycloalkyl, heterocyclyl, wherein aryl, heteroaryl, cycloalkyl, and heterocyclyl are optionally substituted;
• Y is absent, or a spacer
• linker compounds is represented by formula (VI):
• Z2 and Zi are each independently absent or a spacer
• A is a natural or non-natural amino acid, or a peptide comprising 2-20 amino acids;
• W is absent, -0-, -S-, -CR5R5-, -NR4-;
• X is absent, aryl, heteroaryl, cycloalkyl, heterocyclyl, wherein aryl, heteroaryl, cycloalkyl, and heterocyclyl are optionally substituted;
• A4 and A 5 are each independently -0-, -S-, -NRi 8 -, -CR 5 R 6 -;
• Ri7 is selected from the group consisting of O, S, NRig, CR 5 ;
• Rig is selected from the group consisting of H, alkyl, alkynyl, alkenyl, cycloalkyl, aryl, heteroaryl, heterocyclyl, and acyl, wherein alkyl, alkynyl, alkenyl, cycloalkyl, aryl, heteroaryl, heterocyclyl, and acyl are optionally substituted;
• R4, R5, Re and Rg are each independently H, or a substituted or unsubstituted: alkyl, alkenyl, alkynyl, aryl, heteroaryl, or heterocyclyl;
• pi, p2 and p3 are each independently 0, or an integer from 1 to 100;
• x 0, 1 or 2.
• the disclosure provides compounds of formula (VI), wherein Z 2 is represented by the following structural formula:
• alkyl, alkynyl, alkenyl, cycloalkyl, aryl, heteroaryl, and heterocyclyl are optionally substituted and R4, R 5 , 3 ⁇ 4 and Rg are each independently H, or a substituted or unsubstituted: alkyl, alkenyl, alkynyl, aryl, heteroaryl, or heterocyclyl.
• the present disclosure also relates to pharmaceutical composition
• the present disclosure also provides a method of reducing, retarding or stopping an abnormal cell growth comprising contacting the abnormal cell with a compound of formula (I), in an amount sufficient to retard, reduce or stop the abnormal cell growth, and wherein the abnormal cell growth is retarded, reduced or stopped.
• the present disclosure also provides a method of killing a cell, comprising contacting the cell with a compound of formula (1), in an amount sufficient to kill the cell, and wherein the cell is killed.
• the present disclosure also provides a method of treatment of a medical disorder in an individual suffering from the medical disorder, comprising administering to the individual an effective amount of a composition comprising a compound of formula (I).
• the present disclosure also provides a method of reducing tumor size, stopping tumor size increase, reducing tumor proliferation, or preventing tumor proliferation in an individual in need thereof comprising administering to the individual an effective amount of a composition to reduce tumor size, stop tumor size increase, reduce tumor proliferation, or prevent tumor proliferation, wherein the composition comprises a compound of formula (I).
• the present disclosure also relates to precursor Biologically Active Molecule- linker compounds as represented by formula (V).
• Compounds of formula (V) provide building blocks for conjugate compounds of formula (I).
• compounds of formula (V) may be provided as compositions, pharmaceutical compositions and pharmaceutically acceptable salts thereof.
• compositions comprising compounds of formula (I) and/or pharmaceutical formulations in the manufacture of a medicament for the treatment, prevention and/or amelioration of a medical disorder.
• compositions comprising compounds of formula (I) and/or pharmaceutical formulations in the manufacture of a medicament for the treatment, prevention and/or amelioration of a tumor.
• Figures 1-8 depict the results of cell viability assays in which various cancer cell lines were grown in vitro and treated with serial dilutions of antibodies, free drug, or antibody-drug conjugates as shown. Percent viability was determined in accordance with the methods set forth in Example 14.
• FIG 1A shows the cell viability results of C4-2 cells (prostate cancer cell line) treated with compound 2, isotype control antibody conjugated to compound 3 ("Isotype Control-3"), anti-PSMA antibody conjugated to compound 3 ("PSMA-3"), and unconjugated anti-PSMA antibody ("PSMA").
• Figure IB shows the cell viability results of C4-2 cells (prostate cancer cell line) treated with compound 6, isotype control antibody conjugated to compound 7 ("Isotype Control-7"), anti-PSMA antibody conjugated to compound 7 ("PSMA-7”), and unconjugated anti-PSMA antibody ("PSMA").
• Figure 1C shows the cell viability results of C4-2 cells (prostate cancer cell line) treated with compound 25, isotype control antibody conjugated to compound 21 ("isotype Control-21 "), anti-PSMA antibody conjugated to compound 21 ("PSMA-21 11 ), and unconjugated anti-PSMA antibody ("PSMA").
• Figure 2 shows the cell viability results of PC3/hSTEAPl cells (prostate cancer cell line expressing exogenous hSTEAPl) treated with compound 6, isotype control antibody conjugated to compound 7 ("Isotype Control-7"), anti-STEAPl antibody conjugated to compound 7 (“STEAP1-7”), and unconjugated anti-STEAPl antibody (“STEAP1”).
• Isotype Control-7 isotype control antibody conjugated to compound 7
• STEAP1-7 anti-STEAPl antibody conjugated to compound 7
• STEAP1 unconjugated anti-STEAPl antibody
• FIG 3 shows the cell viability results of T47D cells (breast cancer cell line) treated with compound 6, isotype control antibody conjugated to compound 7 ("Isotype Control-7"), anti-PRLR antibody conjugated to compound 7 ("PRLR-7”), and unconjugated anti-PRLR antibody ("PRLR").
• Isotype Control-7 isotype control antibody conjugated to compound 7
• PRLR-7 anti-PRLR antibody conjugated to compound 7
• PRLR unconjugated anti-PRLR antibody
• Figure 4 shows the cell viability results of HEK293/hEGFRvIII cells (HEK293 cells expressing exogenous hEGFRvIII) treated with compound 6, isotype control antibody conjugated to compound 7 ("isotype Control-7 11 ), anti-EGFRvIII antibody conjugated to compound 7 (“EGFRvIII-7”), and unconjugated anti-EGFRvIII antibody (“EGFRvIII”).
• Figure 5 shows the cell viability results of MMT/hEGFRvIII cells (MMT cells expressing exogenous hEGFRvIII) treated with compound 6, isotype control antibody conjugated to compound 7 ("Isotype Control-7"), anti-EGFRvIII antibody conjugated to compound 7 (“EGFRvIII-7”), and unconjugated anti-EGFRvIII antibody (“EGFRvIII”).
• Isotype Control-7 isotype control antibody conjugated to compound 7
• EGFRvIII-7 anti-EGFRvIII antibody conjugated to compound 7
• EGFRvIII unconjugated anti-EGFRvIII antibody
• Figure 6 shows the cell viability results of U251 /hEGFRvIII cells (U251 cells expressing exogenous hEGFRvIII) treated with compound 6, isotype control antibody conjugated to compound 7 ("fsotype Control-7"), anti-EGFRvIII antibody conjugated to compound 7 (“EGFRvIII-7”), and unconjugated anti-EGFRvIII antibody (“EGFRvIII”).
• FIG 7, panels A and B show the cell viability results of HEK293 and U87MG cells, respectively, treated with compounds 6, 27, 29, and 31 (all unconjugated).
• FIG 8 panels A-E show the cell viability results of HEK293, U251, C4-2, PC3 and MMT cells, respectively, treated with compounds 6, 9, 33 and 35 (all unconjugated).
• conjugate refers to compound having a Ligand, linker and Biologically Active Molecule.
• Illustrative examples include compounds of formula (I), (III) and (IV).
• spacer refers to chemical building blocks of the linker used to spatially separate the Ligand from the Biologically Active Molecule and to allow for catabolism of the linker inside of cells.
• a spacer can be represented by Zi and Z 2 .
• macrolide refers to any Biologically Active Molecule having a macrolide ring.
• alkyl refers to a hydrocarbon group having a general formula C n H2n + i .
• alkyl include: methyl, ethyl, 1 -propyl, 2-propyl, 1 -butyl, and the like.
• Typical alkyl have from one to ten carbon atoms, one to nine carbon atoms, one to eight carbon atoms, one to seven carbon atoms, one to six carbon atoms, one to five carbon atoms, one to four carbon atoms, one to three carbon atoms, one to two carbon atoms or one carbon atom.
• aryl refers to a monovalent or polycyclic aromatic hydrocarbon typically having 6 to 18 carbon atoms.
• Example aryl include phenyl (like benzene), substituted benzenes, naphthalene, anthracene, indenyl, tetrahydronapthyl and the like.
• alkynyl refers to a univalent aliphatic hydrocarbon radical containing a triple bond. Typical alkynyl are from two to twenty carbon atoms (and include at least one triple bond). Examples alkynyl include ethynyl, propynyl, 1-butynyl, 2- butynyl, 1-pentynyl, hexynyl and the like.
• cycloalkyl refers to a monovalent saturated carbocyclic ring radical. Typical cycloalkyl are 3 to 7 member monocyclic ring radicals. One example of a cycloalkyl is cyclohexyl.
• heteroaryl refers to a monovalent aromatic radical of 5 or 6 membered rings. Heteroaryl includes fused ring systems (at least one must be aromatic) that include up to 5 to 18 atoms, containing one or more heteroatoms independently selected from nitrogen, sulfur or oxygen. Illustrative heteroaryl are pyridinyl, triazolyl, furyl, pyrazinyl, thienyl, isoxazolyl, indazolyl, furazanyl, benzothiazolyl, quinazolinyl, and furopyridinyl.
• heterocyclyl refers to saturated or partially saturated carbocyclic radical typically of 3 to 18 carbon atoms in which at least one ring atom is a heteroatom selected from nitrogen, oxygen, phosphorous, and sulfur.
• a heterocycyl may be a monocycle or a bicycle, for example.
• Example heterocyclyl are pyrolidinyl,
• salts refers to both organic and inorganic salts of the conjugate compounds described herein, e.g., compounds of formula (I), (III), (IV) and (V).
• the salts are pharmaceutically acceptable and include:
• pharmaceutically acceptable salts herein may include more than one charged atom in its structure as well as one or more counter ion. Preparation of conjugate compounds herein as pharmaceutically acceptable salts is well known to one of skill in the art.
• human antibody as used herein is intended to include antibodies having variable and constant regions derived from human immunoglobulin sequences.
• the human mAbs of the invention may include amino acid residues not encoded by human immunoglobulin sequences (e.g., mutations introduced by random or site-specific mutagenesis in vitro or by somatic mutation in vivo), for example in the CDRs and in particular CDR3.
• human antibody as used herein, is not intended to include mAbs in which CDR sequences derived from the germline of another mammalian species have been grafted onto human FR sequences.
• terapéuticaally effective amount refers to an amount that produces the desired effect for which it is administered. The exact amount will depend on the purpose of the treatment, and will be ascertainable by one skilled in the art using known techniques (see, for example, Lloyd (1 99) The Art, Science and Technology of
• Ligands are any molecule capable of binding with some specificity to a given binding partner within a mammal where the interaction can result in a therapeutic use.
• the Ligand is capable of binding to a cell or cell population.
• Ligands for use herein include antibodies, lymphokines, hormones, growth factors, viral receptors, inter! eukins, or any other cell binding or peptide binding molecule or substance.
• the Ligand is an antibody.
• antibody refers to monoclonal antibodies, polyclonal antibodies, antibody fragments (Fab, Fab', and F(ab)2, minibodies, diabodies, tribodies, and the like), and bispecific antibodies.
• Antibodies herein can be humanized using methods described in US Patent No. 6,596,541 and US Pulication No. 2012/0096572, each incorporated by reference in their entirety.
• the Ligand is an antibody, it binds to an antigen binding partner that is a polypeptide and may be a transmembrane molecule (e.g., receptor) or a growth factor.
• an antigen binding partner that is a polypeptide and may be a transmembrane molecule (e.g., receptor) or a growth factor.
• antigens include, but are not limited to, molecules such as renin; a growth hormone, including human growth hormone and bovine growth hormone; growth hormone releasing factor; parathyroid hormone; thyroid stimulating hormone; lipoproteins; alphal- antitrypsin; insulin A-chain; insulin B-chain; proinsulin; follicle stimulating hormone;
• calcitonin luteinizing hormone; glucagon; clotting factors such as factor vmc, factor IX, tissue factor (TF), and von Willebrands factor; anti-clotting factors such as Protein C; atrial natriuretic factor; lung surfactant; a plasminogen activator, such as urokinase or human urine or tissue-type plasminogen activator (t-PA); bombesin; thrombin; hemopoietic growth factor; tumor necrosis factor-alpha and -beta; enkephalinase; RANTES (regulated on activation normally T-cell expressed and secreted); human macrophage inflammatory protein (M1P-I- alpha); a serum albumin, such as human serum albumin; Muelleri an- inhibiting substance; relaxin A-chain; relaxin B-chain; prorelaxin; mouse gonadotropin-associated peptide; a microbial protein, such as betalactamase; DNase; 19E;
• ETV6-AML Fra-1, FOLR1, GAGE proteins (e.g., GAGE-1 , -2), GD2, GD3, GloboH, glypican-3, GM3, gplOO, Her2, HLA/B-raf, HLA/EBNA1, HLA/k-ras,
• Ligands may also include ankyrin repeat proteins, interferons, lymphokines such as IL-2 or 1L-3, hormones like insulin and glucocorticoids, growth factors such as EGF, transferrin, fibronectin type III, etc.
• Ligands are prepared to interact with and bind to antigens defined as tumor antigens, which include antigens specific for a type of tumor or antigens that are shared, overexpressed or modified on a particular type of tumor.
• Examples include: alpha-actinin-4 with lung cancer, ARTC1 with melanoma, BCR-ABL fusion protein with chronic myeloid leukemia, B-RAF, CLPP or Cdc27 with melanoma, CASP-8 with squamous cell carcinoma, and hsp70-2 with renal cell carcinoma as well as the following shared tumor-specific antigens, for example: BAGE-1, GAGE, GnTV, K-LC-1, MAGE-A2, NA88-A, TRP2-INT2.
• Biologically Active Molecules herein include any molecules that have a therapeutic use in a mammal.
• the molecule is beneficially delivered to a target within the mammal and in particular is beneficially delivered to and then within a cell (e.g., endocytosis) as compared to molecules released into the vascular or lymphatic systems.
• Biologically Active Molecules are compounds that result in the inhibition, retardation, reduction, and/or prevention of cell growth. Biologically Active Molecules can also result in cell death via necrosis or apoptosis.
• Illustrative Biologically Active Molecules for use in conjugate compounds described herein include: maytansinoids (e.g., DM1, DM4, etc.), auristatins (e.g., MMAE, MMAD, MMAF, etc.), duocarmycin (e.g., MGBA), dolastatin, toxoids, and other chemotherapeutically effective drugs.
• Biologically Active Molecules that can be used in the context of the present invention include, e.g., 1-dehydrotestosterone, 2- pyrrolinodoxorubicin, 5-fluorouracil, 6-mercaptopurine, 6-thioguanine, actinomycin D, anthracycline, anthramycin (AMC), bleomycin, busulfan, calicheamicins, carmustine cisplatin, colchicin, cyanomorpholino-doxorubicin, cyclophosphamide, cytarabine, cytochalasin B, dactinomycin, daunorubicin, decarbazine, dibromomannitol, dihydroxy anthracin dione, doxorubicin, emetine, epirubicin, ethidium bromide, etoposide, gramicidin D, glucocorticoids, lidocaine, lo
• the Biologically Active Molecule is a maytansinoid or a maytansinoid analog.
• Exemplary maytansinoids for use herein are described in Widdison et al., J. Med. Chem., 2006, 49, 4392-4408, incorporated by reference herein for all purposes.
• the present disclosure includes a linker compound that is chemically capable of covalently linking two spaced chemical moieties.
• the linker spaces and links two moieties, for example, the linker can link a Ligand and a Biologically Active Molecule.
• the linker is self immolative wherein the linker connects two or more different chemical moieties and releases at least one of the said chemical moieties in the presence of an enzyme.
• the linker may be attached to other chemical moieties, including but not limited to, analytical agents, biomolecules, targeting agents, detectable labels, diagnostic agents, and the like.
• the linker attaches a Biologically Active Molecule and a Ligand.
• the linker attaches a biologically active macrolide and a Ligand.
• the linker attaches a biologically active macrolide and an antibody or fragments thereof.
• the linkers are useful to covalently link ligands with therapeutic agents and markers.
• the linkers improve chemical and/or systemic stability of the attached moieties.
• the linkers reduce in vivo toxicity of the attached moieties.
• the linkers improve pharmacokinetics, pharmacodynamics, and/or bioavailability of the attached moieties.
• the linkers cleave and release a Biologically Active Molecule at a site in or near a target ceil or a cell population in a pharmacologically effective form.
• the cleavage is performed by enzymes.
• the cleavable groups on the linkers for the enzymatic cleavage include, but not limited to, peptide bonds, ester linkages, and disulfide linkages.
• the linker is cleaved through pH changes.
• linker compounds is represented by formula (VI):
• Zz and Z 1 are each independently absent or a spacer
• A is a natural or non-natural amino acid, or a peptide comprising 2-20 amino acids; W is absent, -0-, -S-, -CRs3 ⁇ 4-, -N3 ⁇ 4
• X is absent, aryl, heteroaryl, cycloalkyl, heterocyclyl, wherein aryl, heteroaryl, cycloalkyl, and heterocyclyl are optionally substituted;
• Y is absent, or
• a 4 and A 5 are each independently -0-, -S-, -NRig-, -CR 5 R 6 -;
• Ri7 is selected from the group consisting of O, S, NRig, CR 5 3 ⁇ 4;
• Ri8 is selected from the group consisting of H, alkyl, aikynyl, alkenyl, cycloalkyl, aryl, heteroaryl, heterocyclyl, and acyl, wherein alkyl, aikynyl, alkenyl, cycloalkyl, aryl, heteroaryl, heterocyclyl, and acyl are optionally substituted;
• R4, Rs, R 3 ⁇ 4 and Rg are each independently H, or a substituted or unsubstituted: alkyl, alkenyl, aikynyl, aryl, heteroaryl, or heterocyclyl;
• pi , p2 and p3 are each independently 0, or an integer from 1 to 100;
• x 0, 1 or 2.
• the disclosure provides compounds of formula (VI), wherein Z 2 is represented by the following structural formula:
• alkyl, alkynyl, alkenyl, cycloalkyl, aryl, heteroaryl, and heterocyclyl are optionally substituted and R4, R5, R f i and Rg are each independently H, or a substituted or unsubstituted: alkyl, alkenyl, alkynyl, aryl, heteroaryl, or heterocyclyl.
• the disclosure provides compounds of formula (VI), wherein Zi is represented by the following structural formula:
• alkyl, alkynyl, alkenyl, cycloalkyl, aryl, heteroaryl, and heterocyclyl are optionally substituted and R4, Rs, and Rg are each independently H, or a substituted or unsubstituted: alkyl, alkenyl, alkynyl, aryl, heteroaryl, or heterocyclyl.
• the disclosure provides compounds of formula (VI), wherein A is an amino acid selected from the group consisting of alanine, aspartic acid, glutamic acid, phenylalanine, glycine, histidine, isoleucine, lysine, leucine, methionine, asparagine, proline, glutamine, arginine, serine, threonine, valine, tryptophan, tyrosine, cysteine, and citrulline.
• A is an amino acid selected from the group consisting of alanine, aspartic acid, glutamic acid, phenylalanine, glycine, histidine, isoleucine, lysine, leucine, methionine, asparagine, proline, glutamine, arginine, serine, threonine, valine, tryptophan, tyrosine, cysteine, and citrulline.
• the disclosure provides compounds of formula (VI), wherein A is a peptide selected from the group consisting of valine-citruiline, citrulline- valine, lysine-phenylalanine, phenylalanine-lysine, valine-asparagine, asparagine-valine, threonine-asparagine, serine- asparagine, asparagine-serine, phenylalanine-asparagine, asparagine-phenylalanine, leucine-asparagine, asparagine-leucine, isoleucine-asparagine, asparagine-isoleucine, glycine-asparagine, asparagine-glycine, glutamic acid- asparagine, asparagine-glutamic acid, citrulline-asparagine, asparagine-citrulline, alanine-asparagine, as
• the disclosure provides compounds of formula (VI), wherein X is an aryl
• alkyl, cycloalkyl, aryl, heteroaryl, and heterocyclyl are optionally substituted
• Rn and H are each independently H or an optionally substituted alkyl; and R s is an optionally substituted alkyl.
• the linkers, the biologically active molecules, and other compounds of the present disclosure can be connected to an antibody or antigen-binding molecule through an attachment at a particular amino acid within the antibody or antigen-binding molecule.
• exemplary amino acid attachments that can be used in the context of the disclosure include, e.g., lysine (see, e.g., US 5,208,020; US 2010/0129314; Hollander et al., Bioconjugate Chem,, 2008, 19:358-361; WO 2005/089808; US 5,714,586; US 2013/0101546; and US 2012/0585592), cysteine (see, e.g., US 2007/0258987; WO 2013/055993; WO 2013/055990; WO 2013/053873; WO 2013/053872; WO 2011/130598; US 2013/0101546; and US 7,750,116), selenocysteine (see,
• Linkers can also be conjugated to an antigen-binding protein via attachment to carbohydrates (see, e.g., US 2008/0305497, and Ryan et al., Food &
• the linkers, the biologically active molecules such as drugs can be connected to an antibody or antigen-binding molecule through an attachment at a particular amino acid within the antibody or antigen-binding molecule forming an antibody-drug conjugate (ADC).
• ADC antibody-drug conjugate
• the present disclosure provides Biologically Active Molecules and Ligand conjugates represented by the following structural formula (I): wherein:
• L is absent or a Ligand
• L when L is a Ligand, L is capable of binding to a cell or cell populati on;
• a is an integer from 1 to 10;
• ⁇ 2 and Z] are each independently absent or a spacer
• D is a Biologically Active Molecule
• A is a natural or non-natural amino acid, or a peptide comprising 2-20 amino acids;
• W is absent, -0-, -S-, -CR5R6-, - R4-;
• X is absent, aryl, heteroaryl, cycloalkyl, heterocyclyl, wherein aryl, heteroaryl, cycloalkyl, and heterocyclyl are optionally substituted;
• Y is absent, , or
• A4 and A5 are each independently -0-, -S-, -NRig-, -CR 5 R 6 -;
• Ri 7 is selected from the group consisting of O, S, N is, CRsRg;
• Rig is selected from the group consisting of H, alkyl, alkynyl, alkenyl, cycloalkyl, aryl, heteroaryl, heterocyclyl, and acyl, wherein alkyl, alkynyl, alkenyl, cycloalkyl, aryl, heteroaryl, heterocyclyl, and acyl are optionally substituted;
• R4, R5, R6 and Rg are each independently H, or a substituted or unsubstituted: alkyl, alkenyl, alkynyl, aryl, heteroaryl, or heterocyclyl;
• pi, p2 and p3 are each independently 0, or an integer from 1 to 100;
• x 0, 1 or 2.
• the present disclosure relates to compounds where the Biologically Active Molecule is a cytotoxic biologically active macrolide.
• alkyl, alkynyl, alkenyl, cycloalkyl, aryl, heteroaryl, and heterocyclyl are optionally substituted; and R4, R5, Re and Rs are each independently H, or a substituted or unsubstituted: alkyl, alkenyl, alkynyl, aryl, heteroaryl, or heterocyclyl.
• the maytansinoid is represented by the following structural formula (II)(a):
• the disclosure provides a compound of formula (I), wherein the
• Ligand (L) is capable of binding to a specifically targeted cell population.
• the disclosure provides a compound of formula (I), wherein the Ligand (L) is selected from the group consisting of proteins, antibodies, fragments of antibodies, nucleic acids, antigen binding scaffolds, and carbohydrates.
• the disclosure provides a compound of formula (1), wherein the Ligand (L) is an antibody or a fragment thereof. [0074] In one embodiment, the disclosure provides a compound of formul a (I), wherein Ligand (L) is an antibody or fragment thereof that specifically binds a tumor associated antigen,
• the disclosure provides a compound of formula (I), wherein the antibody or a fragment thereof comprises a sulfur group that is covalently attached with Z 2 .
• alkyl, alkynyl, alkenyl, cycloalkyl, aryl, heteroaryl, and heterocyclyl are optionally substituted and R4, R5, Re and Rg are each independently H, or a substituted or unsubstituted: alkyl, alkenyl, alkynyl, aryl, heteroaryl, or heterocyclyl.
• the disclosure provides compounds of formula (I), wherein the antibody or a fragment thereof comprises a sulfur group that is covalently attached with 2 ⁇
• the disclosure provides compounds of formula (I), wherein Zi is represented by the following structural formula:
• alkyl, alkynyl, alkenyi, cycloalkyl, aryl, heteroaryl, and heterocyclyl are optionally substituted and R , R5, Rg and Rg are each independently H, or a substituted or unsubstituted: alkyl, alkenyi, alkynyl, aryl, heteroaryl, or heterocyclyl.
• the disclosure provides compounds of formula (I), wherein the Biologically Active Molecule (D) is covalently attached with Z ⁇ ,
• the disclosure provides compounds of formula (1), wherein A is an amino acid selected from the group consisting of alanine, aspartic acid, glutamic acid, phenylalanine, glycine, histidine, isoleucine, lysine, leucine, methionine, asparagine, proline, glutamine, arginine, serine, threonine, valine, tryptophan, tyrosine, cysteine, and citrulline.
• A is an amino acid selected from the group consisting of alanine, aspartic acid, glutamic acid, phenylalanine, glycine, histidine, isoleucine, lysine, leucine, methionine, asparagine, proline, glutamine, arginine, serine, threonine, valine, tryptophan, tyrosine, cysteine, and citrulline.
• the disclosure provides compounds of formula (I), wherein A is a peptide selected from the group consisting of valine-citrulline, citrulline-valme, lysine- phenylalanine, phenylalanine-lysine, valine-asparagine, asparagine- valine, threonine- asparagine, serine-asparagine, asparagine-serine, phenylalanine-asparagine, asparagine- phenylalanine, leucine-asparagine, asparagine-leucine, isoleucine-asparagine, asparagine- isoleucine, glycine-asparagine, asparagine-glycine, glutamic acid- asparagine, asparagine- glutamic acid, citruiline-asparagine, asparagine-citrulline, alanine-asparag
• the disclosure provides compounds of formula (I), wherein X is an aryl selected from the group consisting of
• alkyl, cycloalkyl, aryl, heteroaryl, and heterocyclyl are optionally substituted
• Ri3 and R14 are each independently H or an optionally substituted alkyl; and 15 is an optionally substituted alkyl.
• Ab is an antibody or a fragment thereof
• AA1-AA 2 is a peptide selected from the group consisting of valine-citrulline, citrulline-valine, lysine-phenylalanine, phenylalanine-lysine, valine-asparagine, asparagine- valine, threonine-asparagine, serine-asparagine, asparagine-serine, phenylalanine- asparagine, asparagine-pheny 1 alanine, leucine-asparagine, asparagine-leucine, isoleucine-asparagine, asparagine-isoleucine, glycine-asparagine, asparagine-glycine, glutamic acid- asparagine, asparagine-glutamic acid, citrulline-asparagine, asparagine-citrulline, alanine-asparagine, asparagine-alanine;
• a is an integer from 1 to 10;
• q is 0 or an integer from 1 to 5;
• Ri7 is selected from the group consisting of O, S, NRig, CR5R6;
• Ri, R5, 3 ⁇ 4 and Rg are each independently H, or a substituted or unsubstituted: alkyl, alkenyl, alkynyl, aryl, heteroaryl, and heterocyclyl;
• R9, Rio, Ri i, and R !2 are each independently H, halogen, NR13R14, nitro, cyano, -OH, - Rw, substituted or unsubstituted: alkyl, cycloalkyl, aryl, heteroaryl, and heterocyclyl;
• Ri3 and H are each independently H or an optionally substituted alkyl; and Ru is an optionally substituted alkyl;
• pi, p2 and p3 are each independently 0, or an integer from 1 to 100;
• the disclosure provides the compounds of formula (ill) wherein:
• Rj and R3 are each independently -0-, -S-, R4, -CR 5 R 6 -;
• R] is selected from the group consisting of O, S, NR]g, CRsRg;
• Ri8 is selected from the group consisting of H, alkyl, alkynyl, alkenyl, cycloalkyl, aryl, heteroaryl, heterocyclyl, and acyl, wherein alkyl, alkynyl, alkenyl, cycloalkyl, aryl, heteroaryl, heterocyclyl, and acyl are optionally substituted;
• R4, R ⁇ R ⁇ Rp, io, Ri i, R12 are each independently H or alkyl; and
• A3 is an alkyl.
• the disclosure provides the compounds of formula (III) represented
• the disclosure provides the compounds of formula (IV):
• Ab is an antibody or a fragment thereof
• valine-citrulline citrulline- valine, lysine-phenylalanine, phenylalanine-lysine, valine-asparagine, asparagine- valine, threonine-asparagine, serine-asparagine, asparagine-serine, phenylalanine-asparagine, asparagine-phenylalanine, leucine- sparagine, asparagine- leucine, isoleucine-asparagine, asparagine-isoleucine, glycine-asparagine, asparagine-glycine, glutamic acid- asparagine, asparagine-glutamic acid, citrulline-asparagine, asparagine-citrulline, alanine-asparagine, asparagine-alanine; a is an integer from 1 to 10;
• q is 0 or an integer from 1 to 5;
• alkyl is H, or a substituted or unsubstituted: alkyl, alkenyl, alkynyl, aryl, heteroaryl, and heterocyclyl;
• R9, Rio, R11, and j 2 are each independently H, halogen, NR13R14, nitro, cyano, -OH, - Ru, substituted or unsubstituted: alkyl, cycloalkyl, aryl, heteroaryl, and heterocyclyl; and
• R] is selected from the group consisting of-O-, -S-, NR4, and -CR5R5-; and further wherein R4, R 5j and Re are each independently H or alkyl.
• the disclosure provides the compounds of formula (IV) represented by the following structure (IV)(a):
• Ab is an antibody or a fragment thereof.
• the disclosure provides a compound of Formula (V)
• Z 2 and Zi are each independently absent or a spacer
• D is a Biologically Active Molecule
• A is a natural or non-natural amino acid, or a peptide comprising 2-20 amino W is absent, -0-, -S-, -CR5R-6-, or -NR4S
• X is absent, or a substituted or unsubstituted: aryl, heteroaryl, cycloalkyl, hetero
• A4 and A5 are each independently -0-, -S-, -NRig-, -CRjRe
• Ri7 is selected from the group consisting of O, S, NRis, CRsRe;
• RIB is selected from the group consisting of H, alkyl, alkynyl, alkenyl, cycloalkyl, aryl, heteroaryl, heterocyclyl, and acyl, wherein alkyl, alkynyl, alkenyl, cycloalkyl, aryl, heteroaryl, heterocyclyl, and acyl are optionally substituted;
• Rt, R5, Re and 3 ⁇ 4 are each independently H, or a substituted or unsubstituted: alkyl, alkenyl, alkynyl, aryl, heteroaryl, heterocyclyl;
• pi , p2 and p3 are each independently 0, or an integer from 1 to 100;
• x 0, 1 or 2.
• the disclosure provides the compound of formula (V), wherein:
• Z2 is represented by Formula (VII):
• alkyl, alkynyl, alkenyl, cycloalkyl, aryl, heteroaryl, and heterocyclyl are optionally substituted and R4, R 5 , e and R 8 are each independently H, or a substituted or unsubstituted: alkyl, alkenyl, alkynyl, aryl, heteroaryl, heterocyclyl;
• Zi is represented by Formula (Vlli): -ZjA- lB-Zic-ZiEr (VIII),
• alkyl, alkynyl, alkenyl, cycloalkyl, aryl, heteroaryl, and heterocyclyl are optionally substituted and R4, R5, R , 3 ⁇ 4 are each independently H, or a substituted or unsubstituted: alkyl, alkenyl, alkynyl, aryl, heteroaryl, heterocyclyl;
• A is a peptide selected from the group consisting of valine-citrulline, citrulline-valine, lysine-phenylalanine, phenylalanine-lysine, valine-asparagine, asparagine-valine, threonine- asparagine, serine-asparagine, asparagine- serine, phenyl alanine-asparagine, asparagine- phenylalanine, leucine-asparagtne, asparagine-leucine, isoleucine-asparagine, asparagine- isoleucine, glycine-asparagine, asparagine-glycine, glutamic acid- asparagine, asparagine- glutamic acid, citrulline-asparagme, asparagine-citrulline, alanine-asparagine, asparagine- alanine; and
• alkyl, cycloalkyl, aryl, heteroaryl, and heterocyclyl are optionally substituted
• Ri3 and RH are each independently H or an optionally substituted alkyl; and R] 5 is an optionally substituted alkyl.
• the Biologically Active Molecules (D) can optionally be a substituted maytan
• the disclosure provides compounds of formula (V), wherein the biologically active molecule is a optionally substituted maytansinoid represented by the
• the disclosure provides compounds of formula (V), wherein the biologically active molecule is a maytansinoid represented by the following structural formula:
• the disclosure provides compounds of formula (V) represe (V)(d), and (V)(e):
• the disclosure provides the compounds of formula (IX):
• D is a Biologically Active Molecule
• alkyl, alkynyl, alkenyl, cycloalkyl, aryl, heteroaryl, and heterocyclyl are optionally substituted and R4, R5, 3 ⁇ 4 and Rg are each independently H, or a substituted or unsubstituted: alkyl, alkenyl, alkynyl, aryl, heteroaryl, or heterocyclyl.
• the disclosure provides compound of formula (IX) wherein the Biologically Active Molecule is a cytotoxic biologically active macrolide.
• the disclosure provides compound of formula (IX) wherein the biologically active macrolide is a maytansinoid.
• the disclosure provides compound of formula (IX) wherein the maytansinoid is represented by formula (II).
• the disclosure provides compound of formula (IX) wherein the maytansinoid is represented by formula (II)(a).
• the disclosure provides a compound of formula (IX) wherein IC5 0 of the compound is greater than about 10 nM.
• the disclosure provides a compound of formula (IX) wherein the compound is about 10 fold less cytotoxic than the corresponding compound of formula (I).
• Ab is an antibody or a fragment thereof
• a is an integer from 1 to 10;
• Z 2 and Zi are each independently absent or a spacer;
• A is a natural or non-natural amino acid, or a peptide comprising 2-20 amino acids;
• W is absent, -0-, -S-, -CR5R0-, -NR4-;
• X is absent, aryl, heteroaryl, cycioalkyl, heterocyclyl, wherein aryl, heteroaryl, cycio
• A4 and A5 are each independently -0-, -S-, -NRig-, -CR5R6-;
• Ri7 is selected from the group consisting of O, S, NRig, C 53 ⁇ 4;
• ig is selected from the group consisting of H, alkyl, alkynyl, alkenyl, cycioalkyl, aryl, heteroaryl, heterocyclyl, and acyl, wherein alkyl, alkynyl, alkenyl, cycioalkyl, aryl, heteroaryl, heterocyclyl, and acyl are optionally substituted;
• R4, R5, Re and Rg are each independently H, or a substituted or unsubstituted: alkyl, alkenyl, alkynyl, aryl, heteroaryl, or heterocyclyl;
• pi , p2 and p3 are each independently 0, or an integer from 1 to 100;
• x 0, 1 or 2;
• DM is represented by the following structure:
• the disclosure provides the compound of formula (X) represented by the following structure (X)(a):
• a is an integer from 1 to 10.
• Ab is an antibody or a fragment thereof
• AA1-AA2 is a peptide selected from the group consisting of valine-citrulline, citrulHne-valine, lysine-phenylalanine, phenylalanine-lysine, valine-asparagine, asparagine- valine, threonine-asparagine, serine-asparagine, asparagine-serine, phenylalanine-asparagine, asparagine-phenylalanine, leucine-asparagine, asparagine-leucine, isoleucine-asparagine, asparagine-isoleucine, glycine-asparaguie, asparagine-glycine, glutamic acid- asparagine, asparagine-glutamic acid, citrulline-asparagine, asparagine-citralline, alanine-asparagine, asparagine-alanine;
• a is an integer from 1 to 10;
• alkyl, alkynyl, alkenyl, cycloailtyl, aryl, heteroaryl, and heterocyclyl are optionally substituted;
• Ri7 is selected from the group consisting of O, S, NRis, CR 5 R 6 ;
• R4, R5, 3 ⁇ 4 and Rg are each independently H, or a substituted or unsubstituted: alkyl, alkenyl, alkynyl, aryi, heteroaryl, and heterocyclyl;
• Ri 3 and RH are each independently H or an optionally substituted alkyl; and R15 is an optionally substituted alkyl;
• pi, p2 and p3 are each independently 0, or an integer from 1 to 100;
• x 0, 1 or 2;
• the disclosure provides the compound of formula (XI) represented by the following structure (XI)(a):
• the disclosure provides the compounds of formula (I), (III), (IV) (V), and (X), wherein A is a peptide cleavable by a protease.
• the disclosure provides the compound of formula (XI) wherein the peptide is cleavable by a protease.
• the disclosure provides the compounds of formula (1), (III), (IV) (V), and (X) wherein A is a peptide cleavable by a protease expressed in tumor tissue.
• the disclosure provides the compound of formula (XI) wherein the peptide is cleavable by a protease expressed in tumor tissue.
• the disclosure provides the compounds of formula (I), (III),
• A is a peptide cleavable by a protease further wherein the protease is a cathepsin or a plasmin.
• the disclosure provides the compound of formula (XI) wherein the peptide is cleavable by a protease further wherein the protease is a cathepsin or a plasmin.
• Embodiments herein include compositions comprising conjugate compounds of formul (I), (III), (IV), (V), (X), or (XI) as well as mixtures thereof.
• the compound is further represented by a compound of formula (III)(a), (III)(b), (IV)(a), (V)(a),
• Embodiments herein include compositions comprising compounds of formula (I), (III), (IV), (V), (IX), (X), or (XI) as well as mixtures thereof.
• compositions may be pharmaceutical compositions that further include one or more pharmaceutically acceptable carriers, diluents, and/or excipients.
• the pharmaceutical composition is the pharmaceutically acceptable salt of compounds of formula (I), (III), (IV), (V), (IX), (X), or (XI) or mixtures thereof.
• the pharmaceutical composition is the pharmaceutically acceptable salt of compounds of formula (I), (III), (IV), (V), (IX), (X), or (XI) or mixtures thereof.
• Suitable pharmaceutical acceptable carriers, diluents and excipients are well known in the art and can be determined by one of ordinary skill in the art as the clinical situation warrants.
• suitable carriers, diluents and excipients include: buffers for maintenance of proper composition pH (e.g., citrate buffers, succinate buffers, acetate buffers, phosphate buffers, lactate buffers, oxalate buffers and the like), carrier proteins (e.g., human serum albumin), saline, polyols (e.g., trehalose, sucrose, xylitol, sorbitol, and the like), surfactants (e.g., polysorbate 20, polysorbate 80, polyoxolate, and the like), antimicrobials, and antioxidants.
• buffers for maintenance of proper composition pH e.g., citrate buffers, succinate buffers, acetate buffers, phosphate buffers, lactate buffers, oxalate buffers and the
• compositions herein may include a second or more therapeutic agent (e.g., an adjuvant to the conjugate compounds of formula (I), (III),
• the second therapeutic agent can be included in the same composition as the compounds of formula (I), (III), (IV), (V), (IX), (X), and/or (XI), or can be administered separately from the compounds of formula (I), (III), (IV), (V), (IX), (X), and/or (XI) (by time, or type and location of administration).
• each of the compounds of formula (I), (III), (IV), (V), (IX), (X), and/or (XI) can be modified in such a manner that the resulting compound still retains specificity and/or activity similar to the starting compound.
• the Biologically Active Molecule (D) of compounds of formula (I), (III), (IV), (V), (IX), (X), and/or (XI) can include any and all of the Biologically Active Molecules' analogues and derivatives.
• the Biologically Active Molecules is a macrolide and further is maytansine or an analogue of maytansine as described in Widdison et al, J. Med. Chem., 2006, 49 (14), 4392-4408.
• the disclosure provides the pharmaceutical composition comprising a therapeutically effective amount of a compound of formula (I) , (III) ,(IV), (X), (XI) including (IIl)(a), (III)(b) (lV)(a), (X)(a), and (XI)(a), or a pharmaceutically acceptable salt thereof and one or more pharmaceutically acceptable carriers, diluents, or excipients.
• the disclosure provides the pharmaceutical composition comprising a therapeutically effective amount of a compound of formula (I) , (III) ,(IV), (V),
• composition comprising a therapeutically effective amount of a compound of formula (V) including
• the disclosure provides pharmaceutical composition comprising a therapeutically effective amount of a compound of formula (IX), or a pharmaceutically acceptable salt thereof and one or more pharmaceutically acceptable carriers, diluents, or excipients.
• the disclosure provides pharmaceutical composition
• conjugate compounds of formula (I), (III), (IV), (X), and (XI) can be produced with various functional groups such that attachment of the Ligand (L) to the linker and thereby a Biologically Active Molecule form a covalent conjugate.
• the Ligand specially targets the conjugate compound to the Ligand binding partner, typically a polypeptide or other like antigen.
• the conjugate is designed to include a Ligand having a binding partner found on cells undergoing abnormal cell growth or cells involved in a proliferative disorder.
• conjugate compounds of formula (I), (III), (IV), (X), and (XI) have been designed such that each compound's linker is catabolized inside the cell bound by the conjugate.
• delivery of a Biologically Active Molecule through the conjugate embodiments herein allows for delivery of Biologically Active Molecules that would normally be too toxic to administer conventionally.
• the embodiments herein allow for highly selective and specific delivery of these molecules to cells undergoing abnormal cell growth or cells involved in proliferative disorders (as compared to catabolism outside the cell, thereby releasing the biologically active compound into the blood or lymphatic system, for example).
• the covalent conjugate compounds described herein can also be used to deliver any type of useful Biologically Active Molecule and can be selectively targeted to any type of cell population, for example, the conjugate may be used to deliver anti-proliferative drugs to cells undergoing abnormal growth or anti-viral drugs to cells infected with a virus, as long as the selected Ligand recognizes a proper cell binding partner.
• the pharmaceutical compositions described herein are useful in inhibiting, retarding and/or preventing abnormal cell growth or in the treatment of various proliferative disorders or disease states in mammals.
• the mammal is a human (embodiments herein will be described in relation to humans).
• Other mammals include any mammal that can suffer from a detectable proliferative disorder, including primates, dogs, cats, horses, goats, sheep, cattle, camels, and the like.
• the conjugate compounds of the pharmaceutical compositions are designed for selective targeting to the cells undergoing abnormal cell growth or for the treatment of the various proliferative disorders or disease states described herein.
• embodiments herein include methods of inhibiting abnormal cell growth or treatment of a proliferative disorder in a human comprising administering to the human a therapeutically effective amount of a pharmaceutical composition described herein.
• Administration of a therapeutically effective amount of a pharmaceutical composition described herein may be effected in different ways, e.g., by intravenous, intraperitoneal, subcutaneous, intramuscular, topical, intradermal, intranasal, or
• the pharmaceutical compositions herein may also be administered directly to an abnormal cell growth site (directly or indirectly contacting the abnormal cell growth) by, for example, biolistic delivery (biolistic delivery of the pharmaceutical compositions herein to a lung or brain tumor, for example).
• Dosage regiments for administration of the pharmaceutical compositions herein will be determined by the attending health care professional or other person of skill in the art as well as based on the particular clinical situation. As is well known in the pharmaceutical arts, dosages for any one human, i.e., patient, depends on a number of factors, including patient size, patient's body surface area, patient's age and general health, patient's sex, the time and route of administration, and presence of a second therapeutic agent.
• conjugate compounds of formula (I), (III), (IV), (X), and/or (XI) may be present in amounts between 1 ⁇ g and 100 mg/kg body weight per dose (note that where continuous infusion is considered as an administration route, as little as 1 pg/kg body weight per minute may be considered).
• Pharmaceutical compositions can be administered one or more times a day and over a period of days, weeks, months, or years.
• Treatment of proliferative disorder or disease includes methods of reducing a tumor size, causing necrosis or apoptosis in a tumor, killing a tumor, stopping a tumor from increasing in size and/or preventing invasiveness or metastasis of a tumor.
• Examples of medical conditions that can be treated according to methods of inhibiting abnormal cell growth, or treating proliferative disorders include: malignancy of any type, e.g., cancer of the lung, colon, prostate, kidney, pancreas, liver, ovary, skin, lymphoma, leukemia and the like; autoimmune diseases, e.g., systemic lupus, rheumatoid arthritis, multiple sclerosis; viral infections, e.g., CMV infection, HIV infection, AIDS, Hepatitis, HPV infection; pain; mental disorders; and inflammatory diseases.
• malignancy of any type e.g., cancer of the lung, colon, prostate, kidney, pancreas, liver, ovary, skin, lymphoma, leukemia and the like
• autoimmune diseases e.g., systemic lupus, rheumatoid arthritis, multiple sclerosis
• viral infections e.g., CMV infection, HIV infection, AIDS, Hepatitis, HPV
• compositions described herein are also useful in the prevention or treatment of viral infections, pain, inflammatory diseases, autoimmune diseases, and the like in a mammal.
• the disclosure provides a method of reducing, retarding or stopping an abnormal cell growth comprising contacting the abnormal cell with a compound of formula (I), (III) (IV), (X), and/or (XI) in an amount sufficient to retard, reduce or stop the abnormal cell growth, and wherein the abnormal cell growth is retarded, reduced or stopped.
• the disclosure provides a method of killing a cell, comprising contacting the cell with a compound of formula (I), (III), (IV), (X), and/or (XI) in an amount sufficient to kill the cell, and wherein the cell is killed.
• the disclosure provides a method of killing a cell, comprising contacting the cell with a compound of formula (I), (III), (IV), (X), and/or (XI) in an amount sufficient to kill the cell, and wherein the cell is killed and further wherein the cell is a tumor cell.
• the disclosure provides a method of treatment of a medical disorder in an indi idual suffering from the medical disorder, comprising administering to the individual an effective amount of a composition comprising a compound of formula (I), (III), (IV), (X), and/or (XI).
• the disclosure provides a method of treatment of a medical disorder in an individual suffering from the medical disorder, comprising administering to the individual an effective amount of a composition comprising a compound of formula (I), (III), (IV), (V), (IX), (X), and/or (XI).
• the disclosure provides a method of treatment of a medical disorder in an individual suffering from the medical disorder comprising administering to the individual an effective amount of a composition comprising a compound of formula (I), (III), (IV), (X), and/or (XI) and further comprising administering sequentially or consecutively an additional therapy.
• the disclosure provides methods, wherein additional therapy is radiation therapy, chemotherapy, or a combination of both.
• the disclosure provides a method of treatment of a medical disorder in an individual suffering from the medical disorder comprising administering to the individual an effective amount of a composition comprising a compound of formula (I), (III), (IV), (X), and/or (XI) and further comprising administering sequentially or consecutively an additional therapy and administering at least one additional therapeutic agent.
• the disclosure provides a method of treatment of a medical disorder in an individual suffering from the medical disorder comprising administering to the individual an effective amount of a composition comprising a compound of formula (I), (III), (IV), (X), and/or (XI) and further comprising administering sequentially or consecutively an additional therapy or administering at least one additional therapeutic agent.
• the medical disorder treated is selected from tumors, cancers, infectious diseases, neurodegenerative diseases, bone disorders, and cardiovascular diseases.
• Embodiments herein also provide methods of preparing compounds of formula (I) from precursor or building block compounds of formula (V).
• the compounds of formula (V) can also be used in therapeutic application where the compound of formula (V) is a pharmaceutical composition.
• compounds of formula (V) can be included in any of the compositions or pharmaceutical compositions of compound (I), (III), (IV), (IX), (X), and/or (XI).
• embodiments herein may include mixtures of compounds as represented by formula (I), (III), (IV), (V), (IX), (X), and/or (XI).
• the Ligand-Biologically Active Molecule conjugate compounds can be generated by any technique known to the skilled artisan.
• the Ligand-Biologically Active Molecule conjugate compounds comprise a Ligand unit, a Biologically Active Molecule, and optionally a Linker that joins the Biologically Active Molecule and the Ligand.
• the covalent attachment of Biologically Active Molecules and/or Linkers to the Ligand can be accomplished using variety of reactions using the amino acid residues of the Ligand, e.g., antibody, including the amine groups of lysine, the free carboxylic acid groups of glutamic and aspartic acid, the sulfhydryl groups of cysteine and the various moieties of the aromatic amino acids.
• conjugates in accordance with various embodiments described herein can be prepared by any known method in the art.
• An illustrative protocol for producing conjugates is provided in the Examples below.
• other known methods can be used, including, for example, protocols described in WO 2009/134977, US Patent No. 7,81 ,572 and US Patent No. 6,441,163, as long as the protocols are used to prepare the compounds as described herein. These references are incorporated by reference for their intended purpose.
• the conjugates can be prepared by i) reacting a Ligand with Linker to form a modified Ligand-Linker compound; ii) optionally purifying the Ligand- Linker compound; iii) conjugating a Biologically Active Molecule, e.g., a macrolide, to the Ligand-Linker to form a conjugate of formula (I), (III), (IV), (X), or (XI); and iv) purifying the conjugate.
• a Biologically Active Molecule e.g., a macrolide
• the conjugates can be prepared by reacting a Biologically Active Molecule with a first component of the Linker (Zi), followed by successive reactions to build out the Linker, including addition of Y, X, W, A and Z 2 , or any combination thereof.
• the conjugates are prepared by reacting a Ligand, Linker and biologically active macrolide in a single reaction. Once the conjugates in accordance with the invention are prepared they can be purified.
• the conjugate compounds described herein can be evaluated for their ability to suppress proliferation of various cancer cell lines in vitro.
• the in vitro cytotoxicity assays can be conducted using methods known in the art (see Widdison et al., J. Med. Chem., 2006, 49(14), 4392-408) and as illustrated in Example 7 herein.
• conjugate compounds can be applied to in vitro plated cancer cells for a predetermined number of days and surviving cells measured in assays by known methods. Proper controls can be utilized to ensure validity of results as can IC5 0 values. Examples of in vitro potency of conjugate compounds herein can be seen in Figures 1 and 2.
• Proton NMR spectra (for compounds that could not be detected by UV) were acquired on a Varian Inova 300 MHz instrument, while mass spectra were collected on an Agilent 1100 series LC/MSD with electrospray ionization source and triple-quad ion trap analyzer. Appropriate conjugates were analyzed using a Bruker ultraFleXtreme MALDI- TOF-TOF mass spectrometer. All starting materials and solvents were purchased commercially and used without purification, unless otherwise noted.
• Step 1 Maytansin-3 -N-m ethyl-L ⁇ lan ine (2)
• Step 2 Maytansin-3-N-methyl-L-(S) ⁇ alanine-N-[ 4- (amino-citrulline-valine- hexanam ide-6-maleim idyl) benzyl] carbarn ate (3):
• Step 1 N-tert-Butoxycarbonyl-beta-alanine succinate ester (4)
• Step 2 Mayt nsin-3-N-methyl-L-(S)-alanine-Boc-fi-Ala (5)
• Step 3 Maytansm-3-N-jnethyl-L-(S)-alanine-fi-Ala (6)
• Step 4 Maytansin-3-N-methyl-L-(S)-alanine-propanamidyl-3-N-7nethyl ⁇ N-[4' (ainino ⁇ cit ⁇ -unine-valine ⁇ exanamide-6-maleimidyl)benzylJcai'bamate (7)
• Step 1 3-Methyldithio-propionic acid succinate ester (8)
• Step 2 Maytansin-3-N- ethyl-L-(S)-alaninepropanamidyl-3-methyldisulfide
• Step 3 Maytansin-3-N-methyl-L-(S)-alanine-propanamide-3-ihiol (10)
• the title compound was prepared using a modified version of the method described by Whitesides et al. (J. Org. Chem., 1991, 56, 2648-2650).
• the product of the preceding step (9, 2,42 g, 3.09 mmol) was dissolved in acetonitrile (30 mL), treated with a solution of tris(2-carboxyethyl)phosphine hydrochloride (8.23 g, 28.7 mmol) in water (30 mL), the pH raised to 3 with the addition of saturated aqueous NaHCOj (5 mL), the f!ask purged with Ar, and the reaction stirred at ambient temperature under a rubber septum (vented due to effervescence).
• Step 4 4 ⁇ Amino-(N-benzyloxycarbonyl)benzylamine (14)
• 4-Aminobenzylamine (1.00 g, 8.18 mmol) and triethylamine (1.20 mL, 8.61 mmol) were dissolved in anhydrous tetrahydrofuran (THF, 10 mL) under N 2 , cooled in a brine/ice bath with stirring, and treated dropwise over 20 min with a solution of benzyl chloroformate (1.20 mL, 8.41 mmol) in anhydrous THF (10 mL).
• the title compound was prepared as a colorless gum from commercial 6- aminocaproic acid by a method similar to that of Marnett et al. (J. Med. Chem., 1 96, 39,
• Step 11 Maytansin-3-N-methyl-L-(S)-alanine-propanamidyl-3-N-[4-(amino- citfuUine-Boc-valine) -benzyl] -dith iocarbamate (18)
• Step 12 Mayta in-3-N- ethyl-L-(S)-alanine-propanamidyl-3-N-[4-(amino- citrulline-valine)-benzyl]-dithiocarbamate (19)
• Step 13 Maytansin-3-N-methyl-L-( )-alanine-propanamidyl-3-N-[4-(amino- citrulline-valine-hexanamide-6-maieimidyl)benzyl]-dithiocarbamate (21)
• Step 3 Maytansin-3-N-methyl»L ⁇ (&)-alanine ⁇ ropanamidyl-3-N-[4- (acetamidyl) benzyl] -dithio-carbamate (25)
• Step 3 The product of the preceding step (24, 0.093 g, 0.45 mmol) and the product of Example 3, Step 3 (10, 0.070 g, 0.095 mmol) were dissolved in acetonitrile (MeCN, 2 mL) and dry DMF (1 mL), and treated with basic alumina (activated, Brockniann I, 0.357 g).
• Step 1 Maytmsin-3-N-methyl-L-(S)-alanine-N-carboxy-6-[3,4-dihydro-2-(tert- butoxycarbonyl) -lH-isoquinoline ]
• Step 2 Maytamin-3-N-methy!-L-fi)-alanine-N-carboxy-6-(l, 2,3,4- tetrahydroisoquinoline) (33)
• Step 1 Maytansm-3-N-methyl-L-(S)-alanine- N-carboxy-4-fl-(tert- butoxycarbonyl) -piperidine ]
• the title compound was prepared as a white solid (0.027 g, 46%) from maytan- 3-N-methyl-L-(5)-alanine (2, 0.045 g, 0.069 mmol) and commercial 1-t- butoxycarbonylpiperidine-4-carboxylic acid (34, 0.024 g,0.105 mmol) by the method of Example 8, Step 1.
• Step 2 Maytansin-3-N-methyl-L-(&)-alanine- N-carboxy-4-piperidine (35)
• Step 1 Maytansin- 3 -N-methyl-L-(S) -alanine- N-methyl-beta-alanine-N-[4- (tert-butoxycarbonyl-valine-citrultine-amino)benzyloxy]-carbamate
• Step 2 Maytansin-3-N-methyl-L-(&)-alanine- N-methyl-beta-alanine-N-[4- (valine-cUrulline-amino)benzyloxy]-carbamate (37)
• Step 3 Maytansin- 3 -N-methyl-L-(&) -alanine- N-methyl-beta-alanine-N-[4- (4- ⁇ isothiocyanato-phenyl ⁇ -thioureido-vali -citrulline-amino )benzyloxy] -carbamate (39)
• Step 1 l-(4-Arnino ⁇ butyl)-maleirnide
• Step 2 l-(4-Isothiocyanato-butyl)-maleimide (41)
• Step 3 Maytansin-3-N-methyl-L-(S)-alanme ⁇ N-methyl-beta-alanine-N ⁇ [4- (4- ⁇ maleimidylbutylj-thioureido-valine-citrullin ⁇ (42)
• the four antibodies used in these experiments were: (1) a PSMA antibody having the heavy and light chain variable domains of clone AB-PG1-XG 1-006 as set forth in WO 2007002222A2, (2) a STEAP1 antibody having the heavy and light chain variable domains of clone mul20, expressed as a hlgGl, as set forth in WO 2008052187A2, (3) an EGFRvIII antibody having the heavy and light chain variable domains of clone 131 as set forth in WO2013075048A1, and (4) a PRLR having the heavy and light chain variable domains of clone H1H6953N as set forth in US Application Serial No.
• OD450 levels CC 8
• nuclear counts from digitonin (40 nM) treated cells were subtracted from all wells and viability is expressed as a percentage of the untreated controls.
• IC50 values were determined from a four- parameter logistic equation over a 10-point response curve (GraphPad Prism). All curves and IC50 values are corrected for payload equivalents.
• the maytansinoid conjugate STEAP1-7 In PC3/hSTEAPl cells (prostate cancer line), expressing hSTEAPl at 352 fold above isotype control binding, the maytansinoid conjugate STEAP1-7 possesses an IC 50 value of 4 nM ( Figure 2). The naked STEAP1 antibody was devoid of any anti-proliferation activity.
• T47D cells In T47D cells (breast cancer line), natively expressing PRLR at 14 fold above isotype control binding, the maytansinoid conjugate PRLR-7 possesses an IC50 value of 1 ,0 nM ( Figure 3). The naked T47D antibody was devoid of any anti-proliferation activity.
• the maytansinoid conjugate EGFRvIII-7 possesses an IC50 value of 0.4 nM ( Figure 4).
• the naked EGFRvIII antibody was devoid of any anti-proliferation activity.
• the maytansinoid conjugate EGFRvIII-7 possesses an IC50 value of 0.3 nM ( Figure 5).
• the naked EGFRvIII antibody was devoid of any anti-proliferation activity.
• Anti-EGFRvIII Antibody Drug Conjugates are Potent Inhibitors of Tumor Growth in in vivo EGFRvIII Positive Breast Cancer Allograft Models
• H1H1863N2 comprises a heavy chain variable region (HCVR) comprising SEQ ID NO: l; a light chain variable region (LCVR) comprising SEQ ID NO:5; heavy chain complementarity determining regions (HCDRl , HCDR2 and HCDR3) comprising SEQ ID NOs: 2, 3 and 4, respectively; and light chain complementarity determining regions (LCDR1 , LCDR2 and LCDR3) comprising SEQ ID NOs: 6, 7 and 8, respectively.
• HCVR heavy chain variable region
• LCVR light chain variable region
• LCVR light chain variable region
• LCVR heavy chain complementarity determining regions
• LCDR1 , LCDR2 and LCDR3 comprising SEQ ID NOs: 6, 7 and 8, respectively.
• a first ADC was produced by conjugating H1H1863N2 to the maytansinoid DM1 via a non-cleavable MCC linker ⁇ see, e.g., US 5,208,020 and US application
• H1H1863N2-MCC-DM1 A second ADC was produced by conjugating H1H1863N2 to 7 to yield "H1H1863N2-7.”
• H1H1863N2- MCC-DM1 exhibited an IC 50 of 12 nM whereas H1H1863N2-7 exhibited an IC 5 o of only 0.8 nM.
• the anti-EGFRvIII ADC H1H1863N2-7 exhibited much more potent tumor cell killing ability than the corresponding antibody conjugated to DM1 via an MCC linker.
• mice bearing EGFRvIII positive breast cancer allografts were established by subcutaneous implantation of 0.5xl0 6 MMT/EGFRvlII cells into the left flank of female CB17 SCID mice (Taconic, Hudson, NY). Once tumors had reached an average volume of 140 mm 3 ( ⁇ Day 8), mice were randomized into groups of seven, and dosed with anti-EGFRvIII ADCs using either the MCC-DMl or 7 linker-drug format.
• Control reagents including non-binding ADCs using either the MCC-DMl or 7 linker-drug format, and PBS vehicle were also assessed.
• ADCs were dosed at 1 and 5 mg kg three times over one week and thereafter monitored until an average tumor size of approximately 2000 mm 3 was attained in the group administered with vehicle alone. At this point the Tumor Growth Inhibition was calculated.
• tumor size relative to the vehicle treated group were calculated as follows: tumors were measured with calipers twice a week until the average size of the vehicle group reached 1000mm 3 ; tumor size was calculated using the formula (length x width 2 )/2. Tumor growth inhibition was calculated according to the following formula: (1- (( fi n a]-Ti t ,i t jai)/(C f i n ai-Ci I ,jti a i)))* 100 5 where T (treated group) and C (control group) represent the mean tumor mass on the day the vehicle group reached 1000mm 3 . Results are summarized in Table 3.
• Table 3 Tumor Size and Tumor Growth Inhibition Following Administration of Anti- EGF vIII Antibody-Drug Conjugates and Controls, administered in repeat dose

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