Overall, greater proportions of pts receiving N+C had deeper responses vs SUN (CR, PR1, PR2; Table). Deeper responses with N+C were associated with improved 12-mo PFS rate vs SUN for CR (94.9% vs 82.4%), PR1 (81.3% vs 37.5%), and PR2 (72.1% vs 53.2%). In both arms, increasingly deeper response led to better OS outcome; yet OS rates and medians were comparable between arms for CR, PR1, PR2, and PR3. In CheckMate 9ER, more pts receiving N+C achieved deeper responses vs SUN. Deeper responses were generally associated with improved PFS and OS.