A Study of DS-6000a in Subjects With Advanced Renal Cell Carcinoma and Ovarian Tumors

Inclusion Criteria: * Written informed consent * At least 18 years of age * Eastern Cooperative Oncology Group Performance Status score of 0 or 1 * Availability of archived tumor tissue samples * Has a left ventricular ejection fraction (LVEF) ≥50% by either an echocardiogram (ECHO) or multigated acquisition scan (MUGA) within 28 days before start of study treatment * Has adequate organ function within 7 days before the start of study treatment * Has an adequate treatment washout period prior to start of study treatment * Male participants with female partners of childbearing potential and female participants of child-bearing potential must agree to use a highly effective form of contraception or avoid intercourse during and upon completion of the study and for at least 4 months (for males) and for at least 7 months (for females) after the last dose of study drug. Exclusion Criteria: * Has had prior treatment with other CDH6-targeted agents * Has had prior treatment with an ADC that consists of an exatecan derivative that is a topoisomerase I inhibitor (e.g., trastuzumab deruxtecan, datopotamab deruxtecan, ifinatamab deruxtecan, DS-3939) * Has history or current presence of CNS metastases except for participants who have completed radiotherapy or surgery ≥2 weeks before the start of study treatment and have no evidence of disease progression in the CNS and no requirement for chronic corticosteroid therapy within 2 weeks before the start of study treatment * Has multiple primary malignancies, except adequately resected non-melanoma skin cancer, curatively treated in situ disease, or other solid tumors curatively treated, with no evidence of disease for ≥3 years) * Has a history of myocardial infarction or unstable angina within 6 months before start of study treatment * Has a medical history of symptomatic congestive heart failure (New York Heart Association classes II-IV) or a cardiac arrhythmia requiring treatment * Lung-specific intercurrent clinically significant illnesses * Has an uncontrolled infection requiring systemic therapy