Durable response to olaparib plus continued PD-1 blockade in germline PALB2-mutated triple-negative breast cancer with leptomeningeal metastasis - Yulei Wang; Jiali Lin; Yi Zhang; Bo Liang; Xin Lin; Xiangqing Chen; Lijuan Guo; Yifang Zhang; Yuxia Chen; Guochun Zhang (Medicine, 2026)