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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

• Tucson, Arizona, United States
• Denver, Colorado, United States
• Lake Mary, Florida, United States
• Oklahoma City, Oklahoma, United States
• Nashville, Tennessee, United States
• Nashville, Tennessee, United States
• Chuo Ku, Tokyo, Japan
• Kashiwa-shi, Tokyo, Japan
• Fukuoka, Japan
• Kōtoku, Japan
• Matsuyama, Japan
• Nakatogari, Japan
• Saitama, Japan