Efficacy and safety of gemcitabine and capecitabine combination for patients with previously treated advanced primary pulmonary lymphoepithelioma-like carcinoma: a retrospective single-arm cohort study - Zou, Qi-Hua; Liu, Hui; Huang, Cai-Wen; Kang, Li-Ping; Qiu, Bo; Mai, Jian-Liang; Lin, Yong-Bin; Liang, Ying (Translational Lung Cancer Research; Vol 12, No 1 (January 31, 2023): Translational Lung Cancer Research, 2023)