Infiltrating T lymphocytes and tumor microenvironment within cholangiocarcinoma: immune heterogeneity, intercellular communication, immune checkpoints - Dai, Yunyan; Dong, Chenyang; Wang, Zhiming; Zhou, Yunpeng; Wang, Yi; Hao, Yi; Chen, Pinggui; Liang, Chaojie; Li, Gaopeng (Frontiers in Immunology, 2025)