RecruitingPhase 2Drug trialPhase II Study of Pembrolizumab in Combination With Lenvatinib in Patients With TNBC, NSCLC, and Other Tumor Types and Brain MetastasesThis is a single-center, open-label, multi-cohort Phase II study evaluating the efficacy and safety of pembrolizumab in combination with lenvatinib in patients with solid tumors and brain metastases. The study will be comprised of 3 patient cohorts: triple negative breast cancer (TNBC), non-small cell lung cancer (NSCLC), and solid tumor types other than TNBC and NSCLC. Cohort 3 will be comprised of solid tumor types with established (e.g., renal cell carcinoma \[RCC\], endometrial cancer) or preliminary clinical evidence (e.g., gastric cancer, colorectal cancer) of efficacy of programmed cell death-1 (PD-1) and angiogenesis inhibitors. The study will be conducted using a Simon's optimal two-stage design, and approximately 87 patients will be enrolled concurrently (n=29 per cohort). The primary endpoint is intracranial objective response rate (ORR) as assessed by the modified Response Evaluation Criteria in Solid Tumors (RECIST) v1.1.