miR‐34a has been shown to hinder tumorigenesis in various cancers, including gastric, prostate, and breast cancers.[83, 84, 85] Multiple studies have shown that the Notch signaling pathway is associated with tumor cell proliferation, metastasis, EMT, and apoptosis.[86, 87, 88, 89] The Jagged1/Notch pathway, which is downstream of the canonical TGF‐β2/SMAD signaling pathway, is activated by TGF‐β2.[90] This was confirmed by Han et al.,[91] who found that miR‐34a targets Notch1, thereby suppressing TGF‐β2‐induced EMT in LECs. This evidence concerns the gene TGFB2 and breast cancer.