Multivariable analysis including key clinical factors as covariables indicated that CD8+TILs and the CD73-expressing tumor cells were independently associated with durvalumab outcome (HRs, 0.26 [95% CI, 0.08-0.89] for CD8+TILs; 5.83 [95% CI, 1.33-25.62] for CD73)....Low preexisting CD8+TILs or high CD73-expressing tumor cells were suggested to be primary resistance mechanism to durvalumab after CCRT in stage III NSCLC.