Phase 1a/b Study of ZL-6201 Safety, PK, and Preliminary Efficacy in Sarcoma and Selected Tumors

Inclusion Criteria: * Adult men and women ≥18 years of age at the time of signing the ICF with an Eastern Cooperative Oncology Group (ECOG) performance status of 0 or 1 and a life expectancy \> 3 months * Participants must have histologically confirmed and documented diagnosis of locally advanced unresectable and/or metastatic sarcoma or a selected solid tumor * Participants must be willing to undergo a tumor biopsy prior to start of treatment or provide archived tumor tissue sample * Participants with sarcoma should have received no more than 2 lines of previous systemic therapies in the metastatic setting * Participants with selected epithelial solid tumors should have received no more than 3 lines of previous systemic therapy in the metastatic/relapsed refractory setting * Participants must have at least one measurable target lesion as defined by RECIST v1.1 * Adequate organ and marrow function as listed per protocol * Must be negative for HIV, HBV, and HCV Exclusion Criteria: * Participants with another known malignancy that has required treatment within the last 2 years * Symptomatic central nervous system (CNS) metastasis, and/or those requiring therapy with corticosteroids or anticonvulsants to control associated symptoms * Participants with leptomeningeal metastasis * Most recent systemic anti-cancer treatment or investigational products/devices less than 3 weeks * Prior treatment with a topoisomerase-1 inhibitor antibody drug conjugate * Impaired cardiac function or clinically significant cardiac disease within the last 3 months before administration of the first dose of the study treatment * Clinically significant pulmonary disease including autoimmune, connective tissue, or inflammatory conditions * Pregnant or nursing (lactating) women