A phase 1b clinical trial, IOLite, evaluated the safety and efficacy of dostarlimab in combination with niraparib or carboplatin–paclitaxel, with or without bevacizumab, in patients with advanced solid tumors. The study found these combinations to be safe and tolerable, with promising antitumor activity. The trial established recommended phase 2 doses for each combination and observed no new safety signals. Tumor response rates were encouraging, particularly in combinations involving bevacizumab, suggesting potential for further investigation in larger, randomized phase 3 studies.