Adjuvant immunotherapy plus chemotherapy and maintenance immunotherapy for pulmonary lymphoepithelioma-like carcinoma with hepatitis B virus infection, KRAS mutation and high expression of programmed death ligand 1: A case report. - Zhu, Jing; Xu, Qing-Gui; Zhu, Jiao; Zhou, Rui-Xiang; Zhou, Yu-Chuan; Li, Zhi-Ke (Oncology Letters, 2026)