CD4 and breast carcinoma: According to data from the TIMER2.0 database, the expression of CT83 has no significant correlation with any types of TILs in breast cancer tissues or any breast cancer subtypes, with the strongest correlation observed in “T cell CD4 + Th2_XCELL” of the overall cohort (Spearman’s correlation coefficient = 0.4213, p = 0.0000) (Table S4).