Classifications

• • 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
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K31/00—Medicinal preparations containing organic active ingredients
  • A61K31/33—Heterocyclic compounds
  • A61K31/335—Heterocyclic compounds having oxygen as the only ring hetero atom, e.g. fungichromin
  • A61K31/337—Heterocyclic compounds having oxygen as the only ring hetero atom, e.g. fungichromin having four-membered rings, e.g. taxol
• • 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
  • A61K31/435—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having six-membered rings with one nitrogen as the only ring hetero atom
  • A61K31/47—Quinolines; Isoquinolines
• • 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
  • A61K31/495—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having six-membered rings with two or more nitrogen atoms as the only ring heteroatoms, e.g. piperazine or tetrazines
  • A61K31/505—Pyrimidines; Hydrogenated pyrimidines, e.g. trimethoprim
  • A61K31/519—Pyrimidines; Hydrogenated pyrimidines, e.g. trimethoprim ortho- or peri-condensed with heterocyclic rings
• • 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
  • A61K31/555—Heterocyclic compounds containing heavy metals, e.g. hemin, hematin, melarsoprol
• • 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
  • A61K31/70—Carbohydrates; Sugars; Derivatives thereof
  • A61K31/7028—Compounds having saccharide radicals attached to non-saccharide compounds by glycosidic linkages
  • A61K31/7034—Compounds having saccharide radicals attached to non-saccharide compounds by glycosidic linkages attached to a carbocyclic compound, e.g. phloridzin
  • A61K31/704—Compounds having saccharide radicals attached to non-saccharide compounds by glycosidic linkages attached to a carbocyclic compound, e.g. phloridzin attached to a condensed carbocyclic ring system, e.g. sennosides, thiocolchicosides, escin, daunorubicin
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K9/00—Medicinal preparations characterised by special physical form
  • A61K9/0012—Galenical forms characterised by the site of application
  • A61K9/0053—Mouth and digestive tract, i.e. intraoral and peroral administration
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P35/00—Antineoplastic agents
  • A61P35/04—Antineoplastic agents specific for metastasis
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K39/00—Medicinal preparations containing antigens or antibodies
  • A61K2039/505—Medicinal preparations containing antigens or antibodies comprising antibodies
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K39/00—Medicinal preparations containing antigens or antibodies
  • A61K2039/505—Medicinal preparations containing antigens or antibodies comprising antibodies
  • A61K2039/507—Comprising a combination of two or more separate antibodies
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K9/00—Medicinal preparations characterised by special physical form
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07K—PEPTIDES
  • C07K16/00—Immunoglobulins [IG], e.g. monoclonal or polyclonal antibodies
  • C07K16/18—Immunoglobulins [IG], e.g. monoclonal or polyclonal antibodies against material from animals or humans
  • C07K16/22—Immunoglobulins [IG], e.g. monoclonal or polyclonal antibodies against material from animals or humans against growth factors ; against growth regulators
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07K—PEPTIDES
  • C07K16/00—Immunoglobulins [IG], e.g. monoclonal or polyclonal antibodies
  • C07K16/18—Immunoglobulins [IG], e.g. monoclonal or polyclonal antibodies against material from animals or humans
  • C07K16/28—Immunoglobulins [IG], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants
  • C07K16/2803—Immunoglobulins [IG], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants against the immunoglobulin superfamily
  • C07K16/2818—Immunoglobulins [IG], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants against the immunoglobulin superfamily against CD28 or CD152
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07K—PEPTIDES
  • C07K16/00—Immunoglobulins [IG], e.g. monoclonal or polyclonal antibodies
  • C07K16/18—Immunoglobulins [IG], e.g. monoclonal or polyclonal antibodies against material from animals or humans
  • C07K16/32—Immunoglobulins [IG], e.g. monoclonal or polyclonal antibodies against material from animals or humans against translation products of oncogenes
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07K—PEPTIDES
  • C07K2317/00—Immunoglobulins specific features
  • C07K2317/70—Immunoglobulins specific features characterized by effect upon binding to a cell or to an antigen
  • C07K2317/76—Antagonist effect on antigen, e.g. neutralization or inhibition of binding

Definitions

• the present application relates generally to methods of using a WEE1 inhibitor to treat uterine serous carcinoma (USC).
• USC uterine serous carcinoma
• DNA is constantly damaged from the environment. Light, chemicals, stress, and cellular replication lead to single- or double-stranded breakage along DNA’s backbone. Typically, organisms defend against DNA damage by repair proteins that either re-connect or re-synthesize damaged DNA. The correct functioning of these proteins is essential for life. The incorrect replacement of nucleotides into DNA can cause mutations (and other genetic alterations including but not limited to insertions, deletions, and frameshifts), genetic disease, and loss of protein function. The altogether loss of DNA repair can cause cell death, tumor progression, and cancer.
• WEE1 is a nuclear kinase involved in the G2-M cell-cycle checkpoint arrest for DNA repair before mitotic entry. Normal cells repair damaged DNA during G1 arrest. Cancer cells often have a deficient Gl-S checkpoint and depend on a functional G2-M checkpoint for DNA repair. WEE1 is overexpressed in various cancer types, and a number of inhibitors and/or degraders of WEE1 are known to those skilled in the art. See, e.g., WO 2019/173082 and WO 2020/069105.
• Uterine serous carcinoma is a highly aggressive Type II endometrial cancer. See, e.g., Ferriss JS et al, Uterine serous carcinoma: key advances and novel treatment approaches. International Journal of Gynecologic Cancer 2021 ;31 : 1165- 1174. A phase II study of adavosertib in recurrent uterine serous carcinoma has been reported. See Liu JF et al. Phase II study of the WEE1 inhibitor adavosertib in recurrent uterine serous carcinoma. J Clin Oncol 2021;39. However, existing therapeutic approaches remain limited, and thus there is an urgent need for additional therapies.
• Various embodiments provide a method of treating a subject having uterine serous carcinoma (USC), the method comprising administering a therapeutically effective amount of ZN-c3, or a pharmaceutically acceptable salt thereof, to the subject in accordance with a dosing regimen.
• USC uterine serous carcinoma
• FIG. 1 illustrates certain baseline (November 2020) and 2nd restaging (April 2021) peritoneum imaging results for subject #1, demonstrating confirmed partial response at that follow-up timepoint.
• FIG. 2 illustrates certain baseline (January 2021) and 1st restaging (March 2021) peritoneum imaging results for subject #2, demonstrating partial response at that follow-up timepoint.
• FIG. 3 illustrates certain baseline (April 2021) and 5th restaging (November 2021) peritoneum imaging results for subject #3, demonstrating complete response at that follow-up timepoint.
• FIG. 4 illustrates certain baseline (April 2021) and 5th restaging (November 2021) peritoneum imaging results for subject #3, demonstrating complete response at that follow-up timepoint.
• WEE1 is a tyrosine kinase that is a critical component of the ATR- mediated G2 cell cycle checkpoint control that prevents entry into mitosis in response to cellular DNA damage.
• ATR phosphorylates and activates CHK1, which in turn activates WEE1, leading to the selective phosphorylation of cyclin-dependent kinase 1 (CDK1) at Tyrl5, thereby stabilizing the CDKl-cyclin B complex and halting cell-cycle progression.
• CDK1 cyclin-dependent kinase 1
• WEE1 inhibition and/or degradation has the potential to sensitize tumors to DNA-damaging agents, such as cisplatin, and to induce tumor cell death.
• WEE1 inhibition refers to inhibiting the activity or function of a WEE1 tyrosine kinase, e.g., by degrading WEE1 tyrosine kinase and/or by reducing the activity of WEE1 tyrosine kinase with regard to mediating phosphorylation of CDK1.
• a WEE1 inhibitor that functions by degrading WEE1 tyrosine kinase may be referred to herein as a WEE1 degrader.
• a “subject” refers to an animal that is the object of treatment, observation or experiment.
• the subject animal may be a mammal such as, without limitation, mice, rats, rabbits, guinea pigs, dogs, cats, sheep, goats, cows, horses, primates, such as monkeys, chimpanzees, and apes, and, in particular, humans.
• the subject can be human.
• the subject can be a child and/or an infant.
• the subject can be an adult.
• the terms “treat,” “treating,” “treatment,” “therapeutic,” and “therapy” do not necessarily mean total cure or abolition of the disease or condition. Any alleviation of any undesired signs or symptoms of the disease or condition, to any extent can be considered treatment and/or therapy.
• treatment may include acts that may worsen the subject’s overall feeling of well-being or appearance.
• terapéuticaally effective amount and “effective amount” are used to indicate an amount of an active compound (e.g. ZN-c3 or pharmaceutically acceptable salt thereof), that elicits the biological or medicinal response indicated.
• a therapeutically effective amount of such a ZN-c3 compound, salt or composition can be the amount needed to prevent, alleviate or ameliorate symptoms of the disease or condition, or prolong the survival of the subject being treated. This response may occur in a tissue, system, animal or human and includes alleviation of the signs or symptoms of the disease or condition being treated. Determination of an effective amount is well within the capability of those skilled in the art, in view of the disclosure provided herein.
• the therapeutically effective amount of the ZN-c3 compound, salt or composition required as a dose will depend on the route of administration, the type of animal, including human, being treated and the physical characteristics of the specific animal under consideration.
• the dose can be tailored to achieve a desired effect, but will depend on such factors as weight, diet, concurrent medication and other factors which those skilled in the medical arts will recognize.
• an effective amount of a ZN-c3 compound, salt or composition may be the amount that results in: (a) the reduction, alleviation or disappearance of one or more symptoms caused by USC, (b) the reduction of tumor size, (c) the elimination of the tumor, and/or (d) long-term disease stabilization (growth arrest) of the tumor.
• an effective amount of a ZN-c3 compound, salt or composition may be the amount which results in the reduction in WEE1 activity and/or phosphorylation (such as phosphorylation of CDC2).
• the reduction in WEE1 activity is known to those skilled in the art and can be determined by the analysis of WEE1 intrinsic kinase activity and downstream substrate phosphorylation.
• the term “dosing regimen” refers to the manner in which the ZN-c3 compound is administered to the subject, including route of administration, amount of dose and dosing interval.
• a dosing regimen may comprise a “periodic” dosing phase, during which a particular dosage amount (e.g., 300 mg) is administered at regular intervals (e.g., once per day) for a particular period of time (e.g., three days).
• a dosing regimen may further comprise an “intermittent” dosing phase, during which one or more dosing parameters such as dosage amount and/or dosage interval are varied or changed.
• an intermittent dosing phase may comprise a “rest” phase during which the ZN-c3 compound is not administered or is administered at a reduced dosage amount and/or less frequently.
• each chemical element as represented in a compound structure may include any isotope of said element.
• a hydrogen atom may be explicitly disclosed or understood to be present in the compound.
• the hydrogen atom can be any isotope of hydrogen, including but not limited to hydrogen- 1 (protium) and hydrogen-2 (deuterium).
• reference herein to a compound encompasses all potential isotopic forms unless the context clearly dictates otherwise.
• the term “comprising” is to be interpreted synonymously with the phrases “having at least” or “including at least”.
• the term “comprising” means that the compound, composition or device includes at least the recited features or components, but may also include additional features or components.
• ZN-c3 is a selective, orally bioavailable small molecule inhibitor of WEE1, a crucial component of the G2/M cell cycle checkpoint, which prevents cells from entering mitosis to allow repair of DNA damage.
• ZN-c3 has demonstrated significant in vitro antitumor activity in multiple cell lines and xenograft models.
• ZN-c3 can be prepared as described in WO 2019/173082 (see, e.g., Example 9B therein), which is hereby incorporated herein by reference and particularly for the purposes of describing methods for making ZN-c3, as well as for making salts and pharmaceutical compositions thereof.
• compositions that can include an effective amount of the ZN-c3 compound, or a pharmaceutically acceptable salt thereof, and a pharmaceutically acceptable carrier, diluent, excipient or combination thereof.
• composition refers to a mixture of ZN-c3 and/or pharmaceutically acceptable salts thereof, with other chemical components, such as diluents or carriers.
• the pharmaceutical composition facilitates administration of the compound to an organism.
• Pharmaceutical compositions can also be obtained by reacting compounds with inorganic or organic acids such as hydrochloric acid, hydrobromic acid, sulfuric acid, nitric acid, phosphoric acid, methanesulfonic acid, ethanesulfonic acid, p- toluenesulfonic acid, and salicylic acid.
• Pharmaceutical compositions will generally be tailored to the specific intended route of administration.
• physiologically acceptable defines a carrier, diluent or excipient that does not abrogate the biological activity and properties of the ZN-c3 compound nor cause appreciable damage or injury to an animal to which delivery of the composition is intended.
• a “carrier” refers to a compound that facilitates the incorporation of a compound into cells or tissues.
• DMSO dimethyl sulfoxide
• DMSO dimethyl sulfoxide
• a “diluent” refers to an ingredient in a pharmaceutical composition that lacks appreciable pharmacological activity but may be pharmaceutically necessary or desirable.
• a diluent may be used to increase the bulk of a potent drug whose mass is too small for manufacture and/or administration. It may also be a liquid for the dissolution of a drug to be administered by injection, ingestion or inhalation.
• a common form of diluent in the art is a buffered aqueous solution such as, without limitation, phosphate buffered saline that mimics the pH and isotonicity of human blood.
• an “excipient” refers to an essentially inert substance that is added to a pharmaceutical composition to provide, without limitation, bulk, consistency, stability, binding ability, lubrication, disintegrating ability etc., to the composition.
• stabilizers such as anti-oxidants and metal-chelating agents are excipients.
• the pharmaceutical composition comprises an anti-oxidant and/or a metal chelating agent.
• a “diluent” is a type of excipient.
• compositions described herein can be administered to a human patient per se, or in pharmaceutical compositions where they are mixed with other active ingredients, as in combination therapy, or carriers, diluents, excipients or combinations thereof. Proper formulation is dependent upon the route of administration chosen. Techniques for formulation and administration of the compounds described herein are known to those skilled in the art.
• compositions disclosed herein may be manufactured in a manner that is itself known, e.g., by means of conventional mixing, dissolving, granulating, dragee-making, levigating, emulsifying, encapsulating, entrapping or tableting processes. Additionally, the ZN-c3 active ingredients is typically contained in an amount effective to achieve its intended purpose, and may be provided as a salt with pharmaceutically compatible counterions.
• ZN-c3 compound, salt and/or composition may be used, but not limited to, oral, rectal, pulmonary, topical, aerosol, injection, infusion and parenteral delivery, including intramuscular, subcutaneous, intravenous, intramedullary injections, intrathecal, direct intraventricular, intraperitoneal, intranasal and intraocular injections.
• ZN-c3, or a pharmaceutically acceptable salt thereof can be administered orally.
• compositions may, if desired, be presented in a pack or dispenser device which may contain one or more unit dosage forms containing the active ingredient.
• the pack may for example comprise metal or plastic foil, such as a blister pack.
• the pack or dispenser device may be accompanied by instructions for administration.
• the pack or dispenser may also be accompanied with a notice associated with the container in form prescribed by a governmental agency regulating the manufacture, use, or sale of pharmaceuticals, which notice is reflective of approval by the agency of the form of the drug for human or veterinary administration. Such notice, for example, may be the labeling approved by the U.S. Food and Drug Administration for prescription drugs, or the approved product insert.
• Compositions that include ZN-c3 and/or salt, formulated in a compatible pharmaceutical carrier as described herein may also be prepared, placed in an appropriate container, and labeled for treatment of an indicated condition.
• Some embodiments described herein relate to a method of treating a subject having USC, the method comprising administering a therapeutically effective amount of ZN-c3, or a pharmaceutically acceptable salt thereof, to the subject in accordance with a dosing regimen.
• Some embodiments described herein relate to the use of a therapeutically effective amount of ZN-c3, or a pharmaceutically acceptable salt thereof, in the manufacture of a medicament for treating a subject having USC in accordance with a dosing regimen.
• Other embodiments relate to ZN-c3 for use in treating a subject having USC, the treatment comprising administering a therapeutically effective amount of ZN-c3, or a pharmaceutically acceptable salt thereof, to the subject in accordance with a dosing regimen.
• the dosing regimen comprises an oral administration of the ZN-c3 to the subject.
• the therapeutically effective amount of the ZN- c3 administered to the subject is > 300 mg per day.
• the therapeutically effective amount of the ZN-c3 administered to the subject is about 300 mg per day.
• the therapeutically effective amount of the ZN-c3 administered to the subject is about 350 mg per day.
• the therapeutically effective amount of the ZN-c3 administered to the subject is about 200 mg per day.
• the therapeutically effective amount of the ZN-c3 administered to the subject is > 300 mg once daily (QD). In an embodiment, the therapeutically effective amount of the ZN-c3 administered to the subject is about 300 mg once daily (QD).
• the therapeutically effective amount of the ZN-c3 administered to the subject is about 350 mg once daily (QD). In still another embodiment, the therapeutically effective amount of the ZN-c3 administered to the subject is about 200 mg once daily (QD). In some embodiments, the therapeutically effective amount of the ZN- c3 administered to the subject is > 150 mg two times a day (BID). In an embodiment, the therapeutically effective amount of the ZN-c3 administered to the subject is about 150 mg two times a day (BID). In another embodiment, the therapeutically effective amount of the ZN-c3 administered to the subject is about 175 mg two times a day (BID). In still another embodiment, the therapeutically effective amount of the ZN-c3 administered to the subject is about 100 mg two times a day (BID).
• the dosing regimen comprises a periodic dosing phase during which the amount of the dose and the frequency of ZN-c3 administration to the subject is fixed for a period of time, e.g., 3 or more consecutive days.
• the periodic dosing phase comprises a daily dose in the range of about 200 mg per day to about 350 mg per day that is fixed for a period of at least three consecutive days.
• the daily dose is administered once daily (QD).
• the daily dose is administered in divided doses provided two, three or four times daily.
• the periodic dosing phase comprises once daily dosing for a period of at least three consecutive days.
• the dosing regimen comprises an intermittent dosing phase during which the amount of the dose and the frequency of ZN-c3 administration to the subject is changed.
• the intermittent dosing phase comprises at least one change in amount of the ZN-c3 administered to the subject on a daily basis.
• the intermittent dosing phase comprises at least one rest day, e.g., 1, 2, 3, 4, 5, 6 or 7 rest days.
• the dosing regimen comprises a periodic phase during which the ZN-c3 is administered to the subject orally on a once daily basis for five days, following by an intermittent or rest phase during which the ZN-c3 is not administered for two days.
• the subject is a human.
• the subject has USC that is advanced USC.
• the subject has USC that is recurrent USC.
• the subject has been previously treated for the USC by a prior therapeutic regimen.
• a prior therapeutic regimen can include administering a prior USC therapy to the subject.
• the prior USC therapy can include at least one selected from Carboplatin, Paclitaxel, Bevacizumab, Trastuzumab, Pembrolizumab, Lenvatinib and Doxorubicin.
• the amount of the compound of ZN-c3, or pharmaceutically acceptable salt thereof, that is effective in treating a particular case of USC may vary not only with the particulars of the compound or salt selected but also with the route of administration, the nature and/or symptoms of the disease or condition being treated and the age and condition of the patient and will be ultimately at the discretion of the attendant physician or clinician. In cases of administration of a pharmaceutically acceptable salt, dosages may be calculated as the free base. As will be understood by those of skill in the art, in certain situations it may be necessary to administer the ZN-c3 compound, salt or composition in amounts that exceed, or even far exceed, the dosage ranges described herein in order to effectively and aggressively treat particularly aggressive cases of USC.
• the desired dose may conveniently be presented in a single dose or as divided doses administered at appropriate intervals, for example, as two, three, four or more sub-doses per day.
• the sub-dose itself may be further divided, e.g., into a number of discrete loosely spaced administrations.
• the useful in vivo dosage to be administered and the particular mode of administration will vary depending upon the age, weight, the severity of the affliction, the mammalian species treated, the particular ZN-c3 compound, salt or composition employed and the specific use for which these therapies are employed.
• the determination of effective dosage levels can be accomplished by one skilled in the art using routine methods, for example, human clinical trials, in vivo studies and in vitro studies.
• useful dosages of ZN-c3, or pharmaceutically acceptable salts thereof can be determined by comparing their in vitro activity, and in vivo activity in animal models. Such comparison can be done by comparison against an established drug, such as carboplatin and/or paclitaxel.
• Dosage amount and interval may be adjusted individually to provide plasma levels of the active moiety which are sufficient to maintain the modulating effects, or minimal effective concentration (MEC).
• MEC minimal effective concentration
• the MEC will vary for each compound but can be estimated from in vivo and/or in vitro data. Dosages necessary to achieve the MEC will depend on individual characteristics and route of administration. However, HPLC assays or bioassays can be used to determine plasma concentrations. Dosage intervals can also be determined using MEC value.
• Compositions should be administered using a regimen which maintains plasma levels above the MEC for 10-90% of the time, preferably between 30-90% and most preferably between 50-90%. In cases of local administration or selective uptake, the effective local concentration of the drug may not be related to plasma concentration.
• the attending physician would know how to and when to terminate, interrupt or adjust administration due to toxicity or organ dysfunctions. Conversely, the attending physician would also know to adjust treatment to higher levels if the clinical response were not adequate (precluding toxicity).
• the magnitude of an administrated dose in the management of the disorder of interest will vary with the severity of the disease or condition to be treated and to the route of administration. The severity of the disease or condition may, for example, be evaluated, in part, by standard prognostic evaluation methods. Further, the dose and perhaps dose frequency, will also vary according to the age, body weight and response of the individual patient. A program comparable to that discussed above may be used in veterinary medicine.
• ZN-c3 compounds, salts and compositions disclosed herein can be evaluated for efficacy and toxicity using known methods.
• the toxicology of ZN-c3 may be established by determining in vitro toxicity towards a cell line, such as a mammalian, and preferably human, cell line. The results of such studies are often predictive of toxicity in animals, such as mammals, or more specifically, humans.
• the toxicity of particular compounds in an animal model such as mice, rats, rabbits, dogs or monkeys, may be determined using known methods.
• the efficacy of a particular compound may be established using several recognized methods, such as in vitro methods, animal models, or human clinical trials. When selecting a model to determine efficacy, the skilled artisan can be guided by the state of the art to choose an appropriate model, dose, route of administration and/or regime.
• ZN-c3-001 (NCT04158336) is an open label, multicenter, Phase I dose escalation and expansion study evaluating the safety and clinical activity of ZN-c3 in subjects with advanced or metastatic solid tumors, refractory to standard therapy or for whom no standard therapy is available. Oral, daily ZN-c3 dosing was escalated from 25 mg to 450 mg once daily (QD), with a recommended phase 2 dose of 300 mg QD.
• QD once daily
• TRAE treatment-related adverse event
• Tumor marker CA-125 decreased from 36 U/mL at baseline to a minimum of 12 U/mL after ⁇ 3 months of treatment
• FIG. 1 illustrates certain baseline (November 2020) and 2nd restaging (April 2021) peritoneum imaging results for subject #1, demonstrating confirmed partial response at that follow-up timepoint.
• Tumor marker CA-125 decreased from 440 U/mL at baseline to ⁇ 50 U/mL after 2 months of treatment
• FIG. 2 illustrates certain baseline (January 2021) and 1st restaging (March 2021) peritoneum imaging results for subject #2, demonstrating partial response at that follow-up timepoint. The partial response was confirmed at the subsequent tumor assessment.
• FIGS. 3 and 4 illustrate certain baseline (April 2021) and 5th restaging (November 2021) peritoneum imaging results for subject #3, demonstrating complete response at that follow-up timepoint.
• ZN-c3 appears to be safe and well-tolerated as a single agent at oral doses >300 mg QD and demonstrated clinical activity in subjects with recurrent or advanced USC as exemplified in Examples 1-3. Safety results in these subjects were consistent with those of the full study population.
• the ongoing dose expansion study is enrolling USC patients.
• the preliminary efficacy signal will be confirmed in the dedicated phase 2 study (ZN-c3- 004, NCT04814108).

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