Patients ≥18 years old who have large volume of pleural effusion, required evacuation, and received systemic therapy with a checkpoint inhibitor (monotherapy or combination with another checkpoint inhibitor) for metastatic cancers (renal cell carcinoma (RCC) and non-small cell lung cancer (NSCLC) will be eligible. Drainage followed by nivolumab (40 mg, single intrapleural instillation) will be performed.
