Overview
The purpose of this substudy is to assess the efficacy and safety of ifinatamab deruxtecan (I-DXd), given alone or with other treatments in participants with metastatic castration-resistant prostate cancer (mCRPC). The goals of this study are to learn about:
- The safety of the study treatment and if people tolerate it.
- A safe dose level of I-DXd that can be used with other treatments.
- Participant levels of prostate specific antigen (PSA) during treatment.
Description
This sub study MK-2400-01A assesses treatments for metastatic castration-resistant prostate cancer (mCRPC).
The master screening protocol is MK-2400-U01.
Eligibility
Inclusion Criteria:
The main inclusion criteria include but are not limited to the following:
- Has histologically- or cytologically-confirmed adenocarcinoma of the prostate without small cell histology
- Has prostate cancer progression while on androgen deprivation therapy (ADT) (or post bilateral orchiectomy) within 6 months before Screening
- Has current evidence of metastatic disease
- Has received prior treatment with 1 or 2 androgen receptor pathway inhibitors (ARPIs) and progressed during or after treatment
- Participants receiving bone resorptive therapy (including, but not limited to bisphosphonate or denosumab) must have been on stable doses for ≥4 weeks before allocation/randomization
- An Eastern Cooperative Oncology Group (ECOG) performance status of 0 to 1 assessed within 10 days before allocation/randomization
- Has prior treatment with poly-ADP-ribose polymerase inhibitors (PARPi) if indicated by local approved regimen or were deemed ineligible to receive PARPi by the investigator
Exclusion Criteria:
The main exclusion criteria include but are not limited to the following:
- History of (non-infectious) interstitial lung disease (ILD)/pneumonitis that required steroids, or has current ILD/pneumonitis or suspected ILD/pneumonitis
- Clinically severe pulmonary compromise resulting from intercurrent pulmonary illnesses
- Uncontrolled or significant cardiovascular disease
- History of pituitary dysfunction
- Poorly controlled diabetes mellitus
- History or current condition of adrenal insufficiency (eg, Addison's disease)
- Has received prior treatment with taxane-based chemotherapy agent for metastatic castration-resistant prostate cancer (mCRPC).
- Chronic steroid treatment (dose of >10 mg daily prednisone equivalent), except for low-dose inhaled steroids (for asthma/chronic obstructive pulmonary disease), topical steroids (for mild skin conditions), or intra-articular steroid injections
- Received prior radiotherapy within 2 weeks of start of study intervention, or has radiation-related toxicities, requiring corticosteroids
- Known additional malignancy that is progressing or has required active treatment within the past 3 years
- Known active central nervous system (CNS) metastases and/or carcinomatous meningitis
- Active autoimmune disease that has required systemic treatment in the past 2 years
- History of allogeneic tissue/solid organ transplant