KZR-261 in Subjects With Advanced Solid Malignancies

The first-in-human, open-label, multicenter, Phase 1 study of KZR-261, Study KZR-261-101, was conducted in two parts (dose escalation and dose expansion) to evaluate the safety and tolerability, pharmacokinetics, pharmacodynamics, and evaluate the preliminary anti-tumor activity of KZR-261 in participants with locally advanced or metastatic solid malignancies for whom no therapeutics are available (or available therapeutics were refused) that can confer a reasonable likelihood of clinical benefit. The 5 tumor cohorts in the dose expansion part include advanced malignant: * melanoma/uveal melanoma * mesothelioma * colorectal cancer * castration-resistant prostate cancer * "All-Tumors" (other advanced solid malignancies) Part 1 (Dose Escalation) and Part 2 (2A Dose Expansion and 2B Dose Optimization) comprised a 4-week Screening Period, a Treatment Period lasting approximately 24 weeks, 4-6-week Safety Follow-up, and a 12-month Long-Term Follow-up Period (after last dose of study treatment), for a total study duration of approximately 20 months.