A Clinical Study of KTX-2001 in Subjects With Metastatic Castration-Resistant Prostate Cancer (STRIKE-001)

Study K36-MCRPC-001 is the first in human clinical trial testing KTX-2001 alone and with darolutamide in men with metastatic castration-resistant prostate cancer. The study aims to assess whether the drug is safe, increasing doses alone and in combination with darolutamide, whether it is effective in treating metastatic castration-resistant prostate cancer, and measuring how the drug(s) behaves in the body.

Inclusion Criteria: 1. Age ≥18 years. 2. Eastern Cooperative Oncology Group (ECOG) score of 0 or 1. 3. Male participants with mCRPC as defined by PCWG3 criteria. 4. Metastatic disease documented using bone scan for bone metastases (PCWG3 criteria) or by computed tomography (CT) or magnetic resonance imaging (MRI) for soft-tissue metastases. Evidence of metastasis on prostate-specific membrane antigen positron emission tomography alone will not be sufficient for confirmation of metastatic disease. 5. Willingness to undergo a baseline and on-treatment biopsy of a metastatic site if safe and feasible. If tissue from a biopsy of a metastatic site (including bone) obtained within the previous 6 months (prior to treatment start) is available, this tissue may be used, and the baseline biopsy may be omitted. 6. Participants should have progressed on or after receiving an ARPI (eg, abiraterone, enzalutamide, darolutamide, or apalutamide). 7. Adequate renal function (creatinine clearance \>50 mL/min by serum creatinine). 8. Adequate hepatic function (total bilirubin ≤1.5× ULN, total bilirubin \470 msec at screening. 2. Unstable cardiovascular function defined as: 3. Symptomatic ischemia, or 4. Uncontrolled clinically significant conduction abnormalities (ie, ventricular tachycardia on antiarrhythmic agents are excluded; first-degree atrioventricular block or asymptomatic left anterior fascicular block/right bundle branch block are not excluded), or 5. Congestive heart failure New York Heart Association Class ≥3, or 6. Myocardial infarction within 3 months of the screening visit. 7. Hypertension that cannot be controlled (persistent \>150/90 mmHg despite optimal medical therapy). 7. Current use or anticipated need for food or drugs that are known strong CYP3A inducers or inhibitors, including their administration within 10 days or 5 half-lives of the CYP3A inhibitor, whichever is longer prior to first dose of study drug. 8. Treatment with anticancer therapies including radiotherapy or AR-targeted therapy/androgen biosynthesis inhibitor) within 2 weeks prior to initial study drug dose or within 4 weeks for systemic chemotherapy, radioligand therapy, or other systemic anticancer therapies. 9. Treatment with another investigational agent in the 4 weeks prior to the initial dose of study drug. 10. Major surgical procedures ≤28 days prior to the initial dose of study drug. Participants must have recovered from any of the effects of any major surgery. No waiting period is required following central venous access placement, biopsy collection, or minor surgeries as long as the investigator assesses the impact on study participation. 11. Initiation of hormonal agents with antitumor activity against prostate cancer including 5alpha reductase inhibitors, androgens (eg, testosterone), cytoproterone acetate, etc during study participation (from the time of consent to off-study); however, stable use of 5-alpha reductase inhibitors is permitted, if continuous use for ≥6 months. 12. Use of herbal products or alternative therapies that may decrease PSA levels or that may have hormonal anti-prostate cancer activity (eg, saw palmetto, PC-SPES, PC-HOPE, St. John's wort, selenium supplements, grape seed extract, etc) within 4 weeks of study drug initiation or plans to initiate treatment with these products/alternative therapies at any point during the study. For Part B only (KTX-2001 + darolutamide): Current use or anticipated need for drugs that are known as combined P-glycoprotein (P-gp) and strong or moderate CYP3A4 inducers including their administration within 10 days or 5 half-lives of the combined Pgp/CYP3A4 inducer, whichever is longer prior to first dose of darolutamide.