Eligible pts (≥18 y) had tx-naïve metastatic non-small cell lung cancer (NSCLC) with high PD-L1 expression (tumor proportion score ≥50%), cisplatin ineligible locally-advanced/metastatic urothelial cancer (UC) with PD-L1 expression (combined positive score ≥10%)...Confirmed RECIST v1.1 responses were observed in all tumor types (Table) and were consistent with published ORR for other CPIs...Retifanlimab demonstrated antitumor activity...