Author contributions
Z.Lu
PATHOLOGY
All authors verify that this study was done per protocol and vouch for data accuracy and completeness. All authors reviewed and edited the manuscript, provided final approval to publish, and agreed to be accountable for all aspects of the article. C.W. Z.Liu., X.C., J.Q., Z.Lu., L.L. X.S. and C.Z. contributed to the design of the study; C.W. and Z.Liu. supervised and directed the study; C.W., Z.Liu., X.C. and M.Y. contributed to the development of methodology. Q.X. and H.Z. provided guidance on pathology and PD-L1 detection. C.W. and X.Y. performed data collection and analyses and manuscript drafting.