CD4 and breast cancer: In a drug‐induced BC mouse model, EPZ011989 induces immune cell infiltration and activates antitumor functions (CD4+ and CD8+ T cells).[76] Similarly, AR regulation in BC cells can influence PD‐L1 expression, thereby affecting the killing function of NK cells.[77] Specifically, AR restored circ_0 001005 levels by suppressing the transcript of ADAR2 in BC cells.