EP4486395A1 - Markierungsvorläufer und radiotracer mit drei oder mehr targeting-vektoren für die nuklearmedizinische theranostik - Google Patents
Markierungsvorläufer und radiotracer mit drei oder mehr targeting-vektoren für die nuklearmedizinische theranostikInfo
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- EP4486395A1 EP4486395A1 EP23711403.8A EP23711403A EP4486395A1 EP 4486395 A1 EP4486395 A1 EP 4486395A1 EP 23711403 A EP23711403 A EP 23711403A EP 4486395 A1 EP4486395 A1 EP 4486395A1
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K51/00—Preparations containing radioactive substances for use in therapy or testing in vivo
- A61K51/02—Preparations containing radioactive substances for use in therapy or testing in vivo characterised by the carrier, i.e. characterised by the agent or material covalently linked or complexing the radioactive nucleus
- A61K51/04—Organic compounds
- A61K51/0497—Organic compounds conjugates with a carrier being an organic compounds
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K51/00—Preparations containing radioactive substances for use in therapy or testing in vivo
- A61K51/02—Preparations containing radioactive substances for use in therapy or testing in vivo characterised by the carrier, i.e. characterised by the agent or material covalently linked or complexing the radioactive nucleus
- A61K51/04—Organic compounds
- A61K51/0402—Organic compounds carboxylic acid carriers, fatty acids
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K51/00—Preparations containing radioactive substances for use in therapy or testing in vivo
- A61K51/02—Preparations containing radioactive substances for use in therapy or testing in vivo characterised by the carrier, i.e. characterised by the agent or material covalently linked or complexing the radioactive nucleus
- A61K51/04—Organic compounds
- A61K51/041—Heterocyclic compounds
- A61K51/044—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine, rifamycins
- A61K51/0455—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine, rifamycins having six-membered rings with one nitrogen as the only ring hetero atom
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K51/00—Preparations containing radioactive substances for use in therapy or testing in vivo
- A61K51/02—Preparations containing radioactive substances for use in therapy or testing in vivo characterised by the carrier, i.e. characterised by the agent or material covalently linked or complexing the radioactive nucleus
- A61K51/04—Organic compounds
- A61K51/041—Heterocyclic compounds
- A61K51/044—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine, rifamycins
- A61K51/0459—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine, rifamycins having six-membered rings with two nitrogen atoms as the only ring hetero atoms, e.g. piperazine
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K51/00—Preparations containing radioactive substances for use in therapy or testing in vivo
- A61K51/02—Preparations containing radioactive substances for use in therapy or testing in vivo characterised by the carrier, i.e. characterised by the agent or material covalently linked or complexing the radioactive nucleus
- A61K51/04—Organic compounds
- A61K51/0489—Phosphates or phosphonates, e.g. bone-seeking phosphonates
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K51/00—Preparations containing radioactive substances for use in therapy or testing in vivo
- A61K51/02—Preparations containing radioactive substances for use in therapy or testing in vivo characterised by the carrier, i.e. characterised by the agent or material covalently linked or complexing the radioactive nucleus
- A61K51/04—Organic compounds
- A61K51/06—Macromolecular compounds, carriers being organic macromolecular compounds, i.e. organic oligomeric, polymeric, dendrimeric molecules
- A61K51/065—Macromolecular compounds, carriers being organic macromolecular compounds, i.e. organic oligomeric, polymeric, dendrimeric molecules conjugates with carriers being macromolecules
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K51/00—Preparations containing radioactive substances for use in therapy or testing in vivo
- A61K51/02—Preparations containing radioactive substances for use in therapy or testing in vivo characterised by the carrier, i.e. characterised by the agent or material covalently linked or complexing the radioactive nucleus
- A61K51/04—Organic compounds
- A61K51/08—Peptides, e.g. proteins, carriers being peptides, polyamino acids, proteins
- A61K51/083—Peptides, e.g. proteins, carriers being peptides, polyamino acids, proteins the peptide being octreotide or a somatostatin-receptor-binding peptide
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K51/00—Preparations containing radioactive substances for use in therapy or testing in vivo
- A61K51/02—Preparations containing radioactive substances for use in therapy or testing in vivo characterised by the carrier, i.e. characterised by the agent or material covalently linked or complexing the radioactive nucleus
- A61K51/04—Organic compounds
- A61K51/08—Peptides, e.g. proteins, carriers being peptides, polyamino acids, proteins
- A61K51/088—Peptides, e.g. proteins, carriers being peptides, polyamino acids, proteins conjugates with carriers being peptides, polyamino acids or proteins
Definitions
- the present invention relates to label precursors comprising a label moiety for covalent or coordinative labeling with a radioisotope and three or more targeting vectors for targeting cellular receptors, and radiotracers derived therefrom.
- the marker precursors according to the invention comprise 3, 4, 5, 6 or more targeting vectors and are also referred to below as tri-, tetra-, penta- and hexamer or generally as multimer.
- the targeting vectors are conjugated to the tagging group via linkers.
- the tagging group and the targeting vectors are conjugated via linkers to a linking group.
- the marker precursors and radiotracers according to the invention are intended for imaging nuclear medicine diagnosis using positron emission tomography (PET), single photon emission computed tomography (SPECT) and the treatment/therapy (endoradiotherapy/radionuclide therapy) of various tumors and metastases (theranostics).
- Labeling precursors can be used here, which are treated with a metallic radioisotope such as gallium-68 ( 68 Ga) and fluorine-18 ( 18 F) for PET, technetium-99m ( 99m Tc) for SPECT and lutetium-177 ( 177 Lu) or Actinium-225 ( 225 Ac) can be labeled for therapy.
- a metallic radioisotope such as gallium-68 ( 68 Ga) and fluorine-18 ( 18 F) for PET, technetium-99m ( 99m Tc) for SPECT and lutetium-177 ( 177 Lu) or Actinium-225 ( 225 Ac) can be labeled for therapy.
- Each of the three or more targeting vectors binds selectively to membrane-bound receptors, proteins, enzymes or other structures on the surface of tumor cells.
- a linker is arranged between each targeting vector and the labeling or linking group, which ensures sterically largely unhindered binding to the receptor.
- the pre-tag of the invention includes three or more targeting vectors conjugated via linkers directly or through a linking group to a tag moiety (MG) such as a chelator.
- the targeting vectors can be the same or different from one another.
- the accumulation of a radiotracer formed from the labeling precursor by complexation or covalent binding of a radioisotope to a biological tumor target is increased disproportionately compared to analogous radiotracers with one or two targeting vectors (mono- and dimeric radiotracers).
- the radiotracers according to the invention are distinguished by a longer residence time in the tumor (tumor retention). The greater accumulation in connection with prolonged tumor retention results in an increased local radiation dose and significantly improves the therapeutic effectiveness.
- the radiological dose of healthy organs e.g. kidneys, bladder, salivary glands
- the label precursors of the invention open up additional theranostic options for improving biological avidity, tumor accumulation and tumor retention. This extends the range of theranostic applications for radioisotopes with longer half-lives, such as 177 Lu or 225 Ac, for which mono- and dimeric radiotracers often have an insufficient tumor residence time.
- the configuration and chemical properties of a targeting vector conjugated with the labeling group are modified by the labeling group--in particular by chelators--and its affinity for tumor cells is generally influenced. Accordingly, the label precursor needs to be re-evaluated in terms of complexation with radioisotopes and, most importantly, in terms of its in vitro and in vivo biochemical and pharmacological properties.
- the labeling group and its chemical coupling with the targeting vector are decisive for the biological and nuclear medicine potency of the associated radiotracer.
- a chelator is chosen that ensures stable complexation of the respective radioisotope, such as 68 Ga for PET/CT, 99m Tc for SPECT and 177 Lu for therapy.
- Linkers, targeting vectors and, if necessary, a linking group are optimized for the respective medical use.
- Various tumor targeting vectors are conjugated into one molecule in a novel and flexible manner and label precursors or radiotracers are obtained with increased accumulation of relevant biological tumor targets. Due to synergistic effects, a significantly higher theranostic radiation dose is achieved with appropriately marked ( 177 Lu, 225 Ac etc.) radio tracers. Equipping the radiotracer with 3 or more targeting vectors prolongs tumor retention.
- the optional linking group decouples the tagging group from the linkers and targeting vectors and favors their optimization. At the same time, the structural flexibility is increased and the range of applications of the radiotracer is expanded.
- specific targeting vectors and a suitable labeling group are selected.
- a label precursor and a radiotracer derived therefrom fast and effective complexing or binding of the respective radioisotope to the labeling group; high affinity and selectivity for tumor cells and metastases relative to healthy tissue; in vivo stability, ie biochemical stability in blood serum under physiological conditions; high concentration of tumors and metastases for precise diagnosis and effective therapy; rapid clearance from healthy tissues and blood to minimize systemic dose and toxicity.
- the targeting vectors ensure selective enrichment of the radiotracer at the target tissue, which is also referred to as "target” within the scope of the invention.
- Targeting vectors are used that address relevant targets for prostate cancer and bone metastases as well as the tumor stroma in general.
- prostate cancer is the most common type of cancer and the third leading cause of death from cancer. Tumor growth in this disease is slow and when diagnosed early, the 5-year survival rate is nearly 100%. However, if the disease is only discovered after the tumor has metastasized, the survival rate drops drastically. On the other hand, taking action against the tumor too early and too aggressively can unnecessarily impair the patient's quality of life. So e.g. B. surgical removal of the prostate can lead to incontinence and impotence. A reliable diagnosis and information about the stage of the disease are essential for successful treatment with a high quality of life for the patient. A widespread diagnostic tool, in addition to a doctor palpating the prostate, is the determination of tumor markers in the patient's blood.
- PSMA prostate-specific antigen
- NAAG N-acetyl-aspartyl-glutamate
- folic acid-(poly)-y-glutamate PSMA is rarely found in normal tissue, but is highly overexpressed by prostate carcinoma cells, with expression being closely correlated with the stage of the tumor disease. Lymph node and bone metastases from prostate carcinomas also show 40% expression of PSMA.
- PSMA protein structure of PSMA.
- ligands are used which address the enzymatic binding pocket of PSMA.
- the central enzymatic binding pocket of PSMA contains two Zn 2+ ions that bind glutamate.
- the central binding pocket is preceded by an aromatic binding pocket.
- the PSMA protein is able to expand and adapt to different ligands, such as inhibitors or enzymatically cleavable ones (induced fit).
- PSMA also binds folic acid, whereby the Pteroic acid group docks in the aromatic binding pocket.
- Targeting the PSMA binding pocket with an inhibitor or substrate usually induces cellular incorporation (endocytosis).
- PSMA inhibitors are particularly suitable as targeting vectors for imaging diagnostic and theranostic radiopharmaceuticals or radiotracers.
- the radioactively labeled inhibitors dock onto the central PSMA binding pocket, where they are not converted or cleaved enzymatically and the inhibitor/targeting vector is not detached from the radioactive label.
- the inhibitor with the radioactive label is absorbed into the tumor cell and accumulates there.
- Inhibitors with high affinity for PSMA usually contain a glutamate motif and an enzymatically non-cleavable structure.
- a highly effective PSMA inhibitor is 2-phosphonomethylglutaric acid or 2-phosphonomethylpentanedioic acid (2-PMPA), in which the glutamate motif is linked to a phosphonate group that cannot be cleaved by PSMA.
- 2-PMPA 2-phosphonomethylpentanedioic acid
- urea-based PSMA inhibitors are used, such as in clinically relevant radiotracers of the type PSMA-11 (Scheme 2) and PSMA-617 (Scheme 3).
- the binding motif L-lysine-urea-L-glutamate (KuE) is linked via hexyl (hexyl spacer) to an aromatic HBED chelator (N,N'-bis[2-hydroxy -5-carboxy-ethyl)benzyl)ethylene-diamine-N,N'-diacetate).
- Malignant epithelial cells are part of many tumors and tumor types and form a tumor stroma surrounding the tumor at the latest from a size of 1 - 2 mm.
- the tumor stroma includes various non-malignant types of cells that are part of the tumor microenvironment that surrounds the tumor cells.
- the tumor stroma can account for up to 90% of the total tumor mass. It plays an important role in the development, growth and metastasis of tumors, as well as in the supply of tumor cells.
- the main cellular components of the tumor stroma are the extracellular matrix including various cytokines, endothelial cells, pericytes, macrophages, immune regulatory cells and activated fibroblasts.
- the activated fibroblasts surrounding the tumor are referred to as tumor-associated fibroblasts (CAFs, cancer-associated fibroblasts).
- CAFs change their morphology and biological function. These changes are caused by intercellular communication between cancer cells and CAFs induced.
- CAFs create an environment that favors the growth of cancer cells. It has been shown that therapies that target cancer cells alone are inadequate. Effective therapies must take into account the tumor microenvironment and thus also the CAFs.
- FAP fibroblast activation protein
- FAP inhibitors FAPI or FAPi
- DPP dipeptidyl peptidase
- PREP prolyl oligopeptidase
- the difluorinated FAP inhibitor (Scheme 4, right) forms the target vector for various nuclear medicine FAP label precursors and radiotracers.
- Scheme 5 shows the marker precursors FAPI-04 and FAPI-46 as examples (Lindner et al. J. Nucl. Med. 2018, 59 (9), 1415-1422; Altmann et al. J. Nucl. Med 2021, 62, 160-167, Windisch et al EJNMMI Res 2021, 11, 18).
- Scheme 5 shows another FAP-tag precursor comprising the chelator DOTA.
- the chelator DOTA is attached to the quinoline group via a 4-aminobutoxy, a squaric acid and an ethylenediamine group. unit of the pharmacophoric FAPi targeting vector (DOTA.SA.FAPi, Moon et al. EJNMMI Radiopharmacy and Chemistry 2020, 5(1), 19).
- dimeric FAP radiotracers were synthesized, which are structurally composed of two identical targeting vectors (FAP inhibitor lead structures).
- One is the compound DOTA-2P(FAPI) 2 (see Scheme 6 above), which contains the targeting vector and linker of FAPI-46 in duplicate.
- DOTA-2P(FAPI) 2 see Scheme 6 above
- the compounds DOTAGA.(QS.FAPi) 2 in Scheme 6 below. (Moon et al. AJNMMI 2021, accepted). These compounds showed an increase in the tumor residence time compared to the monomeric compounds (cf. Scheme 5).
- Bone metastases express farnesyl pyrophosphate synthase (FPPS), an enzyme in the HMG-CoA reductase (mevalonate) pathway. Inhibiting FPPS suppresses the production of farnesyl, an important molecule for signaling proteins to dock at the cell membrane. As a result, apoptosis of cancerous bone cells is induced. FPPS is inhibited by bisphosphonates such as alendronate, pamidronate and zoledronate. For example, the tracer BPAMD with the targeting vector pamidronate is regularly used in the treatment of bone metastases.
- FPPS farnesyl pyrophosphate synthase
- mevalonate HMG-CoA reductase
- Zoledronate (ZOL), a hydroxy-bisphosphonate with a heteroaromatic imidazole moiety, has proven to be a particularly effective tracer for theranostics of bone metastases.
- Zoledronate conjugated with the chelators NODAGA and DOTA (Scheme 7) are currently the most potent radiotheranostics for bone metastases.
- radiotracers are typically used with the "gold standard" chelator DOTA, which can be coupled to various targeting vectors and ensures stable complexation with 68 Ga (for diagnostics) and 177 Lu (for endoradiotherapy).
- octreotide derivatives such as TOC or TATE are used as targeting vectors.
- the main tagging precursors of this class of compounds are DOTA-TOC and DOTA-TATE.
- 177 Lu-DOTA-TATE is an important radiopharmaceutical approved for the treatment of somastatin receptor (SSTR)-positive tumors.
- PSMA inhibitors are used in nuclear medicine, which as targeting vectors address the prostate-specific membrane antigen (PSMA).
- PSMA-617 compound with DOTA as a chelator and a urea-based inhibitor moiety as a targeting vector is currently the most important.
- the 177 Lu-PSMA-617 is currently being evaluated in clinical phase III studies. (Kopka et al. J. Nucl. Med. 2017, 58(Suppl. 2), 17S-26S; Benesovä et al.
- the DOTA zoledronate is of particular interest here. Zoledronate has a high affinity for the hydroxyapatite structure and diagnostic and therapeutic radioisotopes can be easily introduced via the DOTA chelator. (Meckel et al. EJNMMI Radiopharm. Chem. 2017, 1, 1481; Pfannkuchen et al. Curr. Radiopharm 2018, 11(3), 223-230).
- Tumor-associated fibroblasts are becoming increasingly important as a pan-tumor target.
- the CAFs are found in the tumor microenvironment of various types of cancer and are overexpressed in over 90% of all epithelial tumors (Garin-Chesavet al. Proc. Natl. Acad See USA 1990, 87 (18), 7235-7239).
- the fibroblast activation protein (FAP) a biomarker of the CAFs, is addressed via FAP inhibitors.Since FAP is overexpressed in a large number of tumor types, Corresponding theranostic radiopharmaceuticals with FAP inhibitors as targeting vectors are very interesting for the universal addressing and treatment of many types of cancer.
- the present invention provides multimeric marker precursors having three or more different or the same targeting vectors.
- the targeting vectors can be conjugated with the same or different linkers.
- Each targeting vector is connected to the tagging group or to a linking group via a linker.
- the invention allows radiolabel-independent (orthogonal) adjustment of the affinity and pharmacokinetics of the multimeric label precursor or radiotracer.
- the use of multiple targeting vectors significantly improves the accumulation of the theranostic compound at the biological tumor target and surpasses that of the corresponding monomeric radiotracers.
- multimeric radiotracers are characterized by a significantly longer tumor residence time. The improved accumulation and tumor residence time results in a significantly increased local radiation dose and increases the therapeutic effectiveness.
- the radiation exposure of healthy organs such as the kidneys, bladder and salivary glands, which often limits radionuclide therapy, is reduced.
- the accumulation and tumor residence time of the radiotracers according to the invention is improved by targeting vector multiplication (multiplexing), which is decisive for the therapeutic use of the radioisotopes 177 Lu or 225 Ac.
- the object of the present invention is to overcome the above-described limitations of known radiotracers and diagnostic and therapeutic methods based thereon.
- a labeling precursor for radiotracers comprising a labeling group MG for covalent or coordinate labeling with a radioisotope, three or more targeting vectors TV 1 , TV 2 , TV 3 for addressing cellular receptors, and three or more linkers L 1 , L 2 , L 3 , where each of the three or more linkers L 1 , L 2 , L 3 is covalently conjugated with the labeling group MG and one of the three or more targeting vectors TV 1 , TV 2 , TV 3 , or each of the three or more linkers L 1 , L 2 , L 3 is covalently conjugated with a linking group V and one of the three or more targeting vectors TV 1 , TV 2 , TV 3 and the labeling group MG is covalently conjugated with the linking group V directly or via a linker L.
- Expedient embodiments of the marking precursor according to the invention are characterized by the following features in any combination, insofar as the features are not mutually exclusive, and according to which: the marking precursor the structure has; the three or more targeting vectors TV 1 , TV 2 , TV 3 are chosen independently from one of the structures [1] to [44] with wherein
- X is H or F
- Z is selected from the group consisting of CH 2 , NH, alcohol, amidine, amine, amide, carboxamide, thioamide, imide, imidate, imine, urea, thiourea, guanidine, carbonate , carboxylic acid ester, carbamate, ether, thioether, ester, ketone, phosphate, phosphonate, phospinate, sulfonic acid ester, sulfinic acid ester, sulfone, thiol, disulfide, boronic acid ester, silyl ether radical or - groups and derivatives thereof;
- the precursor marker comprises 3, 4, 5, 6, 7, 8, 9 or 10 targeting vectors;
- the precursor marker comprises 5 to 15 or 10 to 20 targeting vectors;
- the precursor marker comprises 11, 12, 13, 14, 15, 16, 17, 18, 19 or 20 targeting vectors;
- the linker L and the three or more linkers L 1 , L 2 , L 3 independently have a structure selected from wherein A, B,
- the marker group MG is selected from the group comprising DOTA, DATA and DATA 5m ; the marker group MG is selected from the group consisting of NOTA, DATA, DATA 5m and NODAGA; the tag group MG is selected from the group comprising NOTA, DATA, DATA 5m and NODAGA for the complexation of AI 18 F; the labeling group MG is a structural group for the covalent attachment of 18 F, 131 I or 211 At; the marker group MG is selected off the labeling group MG has the structure with a leaving group X for substitution with 18 F, 131 I or 211 At; the labeling group MG contains a leaving group X selected from a residue of bromo (Br), chloro (Cl) or iodo (I), tosyl (Ts), brosylate (Bs), nosylate (Nos), 2-(N- morpholin
- the invention has the object of providing a radiotracer that overcomes the limitations of known radiotracers and diagnostic and therapy methods based thereon, as described above.
- a radiotracer consisting of one of the label precursors described above and a complexed or covalently conjugated radioisotope, wherein the radioisotope is selected from the group consisting of 18 F , 43 Sc, 44 Sc, 47 Sc, 55 Co, 62 Cu, 64 Cu, 67 Cu, 66 Ga, 67 Ga, 68 Ga, 89 Zr, 86 Y, 90 Y, 89 Zr, 90 Nb, 99m Tc, m ln, 131 l, 135 Sm, 140 Pr, 159 Gd, 149 Tb, 160 Tb, 161 Tb, 165 Er, 166 Dy, 166 Ho, 175 Yb, 177 Lu, 186 Re, 188 Re, 203 Pb, 211 At, 212 Pb, 213 Bi , 225 Ac and 232 Th.
- Scheme 9 shows exemplary configurations of label precursors according to the invention without a linking group (Schemes 9a and 9b) and with linking group V (Schemes 9c, 9d, 9e, 9f, 9g and 9h).
- schemes 9a and 9b three or four targeting vectors TV 1 , TV 2 , TV 3 , TV4 are each connected to a marker group MG via a linker L 1 , L 2 , L 3 , U.
- scheme 9c and 9d are a labeling group MG and three, respectively twenty targeting vectors TV 1 , TV 2 , ..., TV20 each via a linker L, L 1 , L 2 , ..., L 20 with a linking group V conjugated.
- the linking group V comprises three tris-linkers TL, TL 1 , TL 2 (schemes 9e and 9f) and seven tris-linkers TL, TL 1 , TL 2 , TL 3 , TU, TL 5 and TL 6 (schemes 9g and 9h).
- Scheme 9a to 9h Configuration examples of label precursors according to the invention.
- the labeling group MG is designed as a chelator for the complexation of a radioisotope or as a group for the covalent binding of a radioisotope.
- the targeting vectors TV 1 , TV 2 , ..., TV 20 can be different from each other, partly the same or completely the same.
- the linkers L, L 1 , L 2 , . . . , L 20 can be different from one another, partially the same or completely the same.
- the inventors have surprisingly found that the multimeric marker precursors described above or the radiotracers derived therefrom with three or more targeting vectors compared to monomeric or dimeric radiotracers with one or two targeting vectors with the same systemic dose and non-specific enrichment (off-target exposure) show a significantly higher accumulation in tumor tissue (target exposure). It is believed that this advantageous property is due to an increased probability of docking and/or selectivity.
- the three or more targeting vectors TV 1 , TV 2 , TV 3 used according to the invention have a high binding affinity to membrane-bound tumor markers, such as in particular PSMA (prostate-specific membrane antigen) and FAP (fibroblast activation protein).
- the marker precursors and radiotracers of the invention also target the tumor stroma.
- TNBC triple negative breast cancer
- the tumor stroma includes cancer-associated fibroblasts (CAFs) and altered endothelial cells (ECs), the FAP and PSMA, respectively overexpress.
- CAFs cancer-associated fibroblasts
- ECs altered endothelial cells
- heteromeric tag precursors containing targeting vectors for FAP and PSMA are useful in the diagnosis and treatment of TNBC.
- radioisotopes such as 177 Lu and 225 Ac directly damages the tumor microenvironment essential for progression and induces "indirect” radiation damage (radiation induced bystander effect, RIBE) in neighboring cancer cells.
- the three or more linkers L 1 , L 2 , L 3 of the label precursors according to the invention act as steric spacers and pharmacokinetic modulators which modulate the biochemical function of the targeting vectors (binding affinity to the target), the radiochemical function of the label group (stable complexation or conjugation of the radioisotope ) and optimize the half-life in the blood serum (hydrophilicity).
- the linkers preferably contain structural elements, such as e.g. B. squaric acid amides or other aromatic moieties which improve the affinity for PSMA.
- the chelator is used for labeling with a radioisotope selected from the group comprising 43 Sc, 44 Sc, 47 Sc, 55 Co, 62 Cu, 64 Cu, 67 Cu, 66 Ga , 67 Ga, 68 Ga, 89 Zr, 86 Y, 90 Y, 89 Zr, 90 Nb, 99m Tc, m ln, 135 Sm, 140 Pr, 159 Gd, 149 Tb, 160 Tb, 161 Tb, 165 Er, 166 Dy , 166 Ho, 175 Yb, 177 Lu, 186 Re, 188 Re, 211 At, 212 Pb, 213 Bi, 225 Ac and 232 Th.
- a radioisotope selected from the group comprising 43 Sc, 44 Sc, 47 Sc, 55 Co, 62 Cu, 64 Cu, 67 Cu, 66 Ga , 67 Ga, 68 Ga, 89 Zr, 86 Y, 90 Y, 89 Zr, 90 Nb, 99m Tc, m
- the invention encompasses radiotracers which can be obtained from the label precursors described above by complexing with a radioisotope, the radioisotope being selected from the group consisting of 43 Sc, 44 Sc, 47 Sc, 55 Co, 62 Cu, 64 Cu, 67 Cu, 66 Ga, 67 Ga, 68 Ga, 89 Zr, 86 Y, 90 Y, 89 Zr, 90 Nb, 99m Tc, m ln, 135 Sm, 140 Pr 159 Gd, 149 Tb, 160 Tb, 161 Tb, 165 Er, 166 Dy, 166 Ho, 175 Yb, 177 Lu, 186 Re, 188 Re, 203 Pb, 211 At, 212 Pb, 213 Bi, 225 Ac and 232 Th.
- Theranostics Diagnostics and therapy of cancer diseases using nuclear medical radiotracers.
- Precursor Label A chemical compound containing a first and second targeting vector and a chelator or radioisotope labeling functional group.
- Radiotracer A radioisotope-labeled tracer precursor for nuclear medicine diagnostics or theranostics that is used at low concentrations without affecting a patient's metabolism.
- Target Biological target structure, in particular (membrane-bound) receptor, protein, enzyme or antibody in the living organism, to which a targeting vector binds.
- Targeting Vector A chemical group or moiety that acts as a ligand, agonist, antagonist, or inhibitor for a biological target (e.g., a protein, enzyme, or receptor) and has high binding affinity for that target.
- a biological target e.g., a protein, enzyme, or receptor
- Linking group structural unit with functional groups for the covalent attachment of linker-targeting-vector conjugates and a labeling group MG.
- Linker A structural unit, group or moiety that functions as a steric and/or pharmacokinetic modulator for targeting vectors and a labeling group.
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Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102022105175.7A DE102022105175A1 (de) | 2022-03-04 | 2022-03-04 | Markierungsvorläufer und Radiotracer mit drei oder mehr Targeting-Vektoren für die nuklearmedizinische Theranostik |
| PCT/EP2023/055015 WO2023165987A1 (de) | 2022-03-04 | 2023-02-28 | Markierungsvorläufer und radiotracer mit drei oder mehr targeting-vektoren für die nuklearmedizinische theranostik |
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| Publication Number | Publication Date |
|---|---|
| EP4486395A1 true EP4486395A1 (de) | 2025-01-08 |
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| EP23711403.8A Withdrawn EP4486395A1 (de) | 2022-03-04 | 2023-02-28 | Markierungsvorläufer und radiotracer mit drei oder mehr targeting-vektoren für die nuklearmedizinische theranostik |
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| EP (1) | EP4486395A1 (de) |
| JP (1) | JP2025507966A (de) |
| KR (1) | KR20240158290A (de) |
| CN (1) | CN118785925A (de) |
| AU (1) | AU2023228308A1 (de) |
| CA (1) | CA3253409A1 (de) |
| DE (1) | DE102022105175A1 (de) |
| WO (1) | WO2023165987A1 (de) |
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| WO2025087229A1 (zh) * | 2023-10-27 | 2025-05-01 | 四川科伦博泰生物医药股份有限公司 | 一类喹啉结构的配体化合物及其放射性或非放射性标记物以及应用 |
| CN119604492A (zh) * | 2023-12-08 | 2025-03-11 | 北京师范大学 | 一种放射性标记fapi配合物及其制备方法和应用 |
| WO2025167951A1 (zh) * | 2024-02-07 | 2025-08-14 | 苏州博锐创合医药有限公司 | 一种成纤维细胞活化蛋白抑制剂 |
| CN119060093B (zh) * | 2024-08-26 | 2025-09-05 | 广州医科大学附属第一医院(广州呼吸中心) | 一种靶向成纤维细胞激活蛋白的抑制剂类放射性探针及其制备方法和应用 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107847618B (zh) * | 2015-07-07 | 2021-07-16 | 五一一制药股份有限公司 | Hbed-二膦酸盐/酯、其放射金属轭合物和它们作为治疗诊断剂的用途 |
| WO2021016392A1 (en) * | 2019-07-22 | 2021-01-28 | Purdue Research Foundation | Multivalent fibroblast-targeted agents and methods of use |
| DE102019135564B4 (de) | 2019-12-20 | 2022-05-19 | Johannes-Gutenberg-Universität Mainz | Verbindung für Smart-Drug-Delivery und pharmazeutisches Kit für duale nuklearmedizinisch-cytotoxische Theranostik |
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2022
- 2022-03-04 DE DE102022105175.7A patent/DE102022105175A1/de not_active Withdrawn
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2023
- 2023-02-28 AU AU2023228308A patent/AU2023228308A1/en active Pending
- 2023-02-28 JP JP2024552450A patent/JP2025507966A/ja active Pending
- 2023-02-28 CA CA3253409A patent/CA3253409A1/en active Pending
- 2023-02-28 WO PCT/EP2023/055015 patent/WO2023165987A1/de not_active Ceased
- 2023-02-28 EP EP23711403.8A patent/EP4486395A1/de not_active Withdrawn
- 2023-02-28 CN CN202380024011.0A patent/CN118785925A/zh active Pending
- 2023-02-28 KR KR1020247032422A patent/KR20240158290A/ko active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| JP2025507966A (ja) | 2025-03-21 |
| AU2023228308A9 (en) | 2024-08-15 |
| AU2023228308A1 (en) | 2024-08-08 |
| CA3253409A1 (en) | 2025-01-24 |
| WO2023165987A1 (de) | 2023-09-07 |
| KR20240158290A (ko) | 2024-11-04 |
| DE102022105175A1 (de) | 2023-09-07 |
| CN118785925A (zh) | 2024-10-15 |
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