Tregs can become a positive factor in cancer progression by suppressing antitumor effector cells.23 A previous study of NSCLC showed that increased number of FOXP3+ lymphocytes in tumors were associated with a reduced rate of relapse‐free survival.24 In this study, we have confirmed that increased levels of GRP94 are significantly positively correlated with FOXP3+ Treg infiltration into lung AD tissues. Here, FOXP3 is linked to cancer.