NFKB1 and breast carcinoma: Recently, an elegant work of Xing and coworkers demonstrated that breast cancer cells reproducing loss of the X-inactive-specific transcript (XIST), MCF7-shXIST, released exosomal miR-503 that promotes the M1 to M2 conversion of microglia through STAT3 and NFκB pathways, inducing the suppression of T-cell proliferation [56].