Phase 1/2, Open-label, Multicenter, First-in-Human Study of DS-3939a in Subjects With Advanced Solid Tumors

Inclusion Criteria: * Sign and date the main Informed Consent Form (ICF). * Has a left ventricular ejection fraction ≥50% by either an echocardiogram or multigated acquisition within 28 days of enrollment. * Has adequate organ function. * Measurable disease based on RECIST V1.1. * Eastern Cooperative Oncology Group performance status score of 0 or 1. Additional inclusion criteria for Part 1 * Has a histologically or cytologically documented locally advanced, metastatic, or unresectable solid malignant tumors. Additional inclusion criteria for Part 2 * Has a histologically or cytologically…