CD274 and neoplasm: The effects of mutp53 on tumor immunity have been reported previously, and mutp53 can upregulate PD‐L1 expression in tumor cells to promote immune escape; thus, we evaluated the role of circCFL1 in the antitumor immunity of CD8+ T cells to TNBC cells.[30] First, qRT‒PCR, western blot, and flow cytometry assays were utilized to examine the expression of PD‐L1 in TNBC cells with circCFL1 knockdown or overexpression, which confirmed that PD‐L1 expression was positively correlated with the expression of circCFL1 (Figure 8A‒C; Figure S10C,D, Supporting Information).