Intrathecal pemetrexed efficacy and cerebrospinal fluid tumor marker response in refractory leptomeningeal metastasis of non-small-cell lung cancer: a single-arm phase II trial. - Xu, Qingsheng; Huang, Kaiyuan; Tong, Luqing; Yan, Danfang; Zhao, Yilei; Yang, Hanjin; Jin, Weili; Zhang, Luyuan; Cai, Jinquan; Chen, Qun (BMC Medicine, 2025)