Kaplan‐Meier estimates of overall survival and progression‐free survival in patients in peripheral blood T‐cell subsets predicting prognosis over time. (A): CD4+ T cells and their subsets at baseline or during treatment were associated with OS and PFS. (B): CD8+ T cells and their subsets at baseline or during treatment were associated with OS and PFS. (C): CD4+CD25+Foxp3+ Treg cells and their subsets during treatment were associated with OS and PFS. The cutoff values were determined by calculated by the Youden index of the receiver operating characteristic curve. Log‐rank p values are reported from an unadjusted analysis. Abbreviations: BL, baseline; CI, confidence interval; CTLA4, cytotoxic T‐lymphocyte–associated protein 4; IFN‐r, Interferon‐gamma; Lymph, lymphocyte; OS, overall survival; PFS, progression‐free survival; RT, radiotherapy (during treatment); Treg, regulatory T cell.