A Clinical Study of Ifinatamab Deruxtecan (I-DXd) in People With Metastatic Prostate Cancer (MK-2400-001)

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 prior to Screening
* Has current evidence of distant metastatic disease (M1 disease) documented by either bone lesions on bone scan and/or soft tissue disease by computed tomography (CT)/magnetic resonance imaging (MRI)
* Has received prior treatment with 1 or 2 androgen receptor pathway inhibitors (ARPIs) and progressed during or after at least 8 weeks of treatment
* Has provided tumor tissue from a core or excisional biopsy from soft tissue not previously irradiated and obtained after disease progression on the most recent prior therapy
* Has recovered from adverse events (AEs) due to previous anticancer therapies

Exclusion Criteria:

The main exclusion criteria include but are not limited to the following:

* Is unable to swallow tablets/capsules
* Has any of the following indicators of interstitial lung disease (ILD)/pneumonitis:

  1. Has any history of ILD/pneumonitis that required steroid use, except for a history of radiation pneumonitis that did not require steroids
  2. Has current ILD/pneumonitis
  3. Has a clinical or radiographic suspicion of ILD for which the diagnosis of ILD cannot be ruled out
* Has clinically severe pulmonary compromise resulting from intercurrent pulmonary illnesses
* Has uncontrolled or significant cardiovascular disease
* Has received prior treatment with a taxane-based chemotherapy agent for metastatic castration-resistant prostate cancer (mCRPC)
* Has had prior discontinuation of an antibody drug conjugate (ADC) that consists of an exatecan derivative (eg, trastuzumab deruxtecan) due to treatment-related toxicities
* Has a "superscan" bone scan