Expression and diagnostic value of plasma exosome PD ⁃L1 in gastric cancer 
DUAN Ruixue, YANG Bin, XIA Tianhong, YAN Long, LIANG Xiaoqin, LIU Hongbin.
The Journal of Practical Medicine . 2023, (13): 1698 -1703 .  DOI: 10.3969/j.issn.1006⁃5725.2023.13.018