Integration of anti-PD-1 antibody into chemotherapeutic regimens improved the outcome of aggressive NK cell leukemia: a single-center retrospective real-world analysis - Shen, Kai; Liao, Yi; Dai, Yang; Ji, Jie; Kuang, Pu; Liu, Zhigang; Xie, Liping; Niu, Ting; Jiang, Nenggang; Ma, Hongbing (Frontiers in Immunology, 2025)