During the 5-week observation period, the tumor regrowth rate in the 2 combination arms was markedly lower than that in the arms that received the single agent, with none of the tumors in the 2 combination arms developing any signs of tumor growth, suggesting the durable antitumor effect of the combination of niraparib and anti-PD-1 (Fig. 4D). This evidence concerns the gene PDCD1 and neoplasm.