TGFBR2 and breast cancer: In our study, the level of TGFBR2 as the target gene of miR-301b-3p in BC cells was inhibited, however, the expression of miR-301b-3p was slightly elevated when TGFBR2 and miR-301b-3p were inhibited, which indicated that TGFBR2 was also involved in suppressing miR-301b-3p.