S100A7 and breast cancer: In addition, we reversed the effects of S100A7 on cell proliferation and tumor growth by overexpressing miR-29b in 231-S100A7 cells and knocking down miR-29b in MCF7-S100A7 cells, which reflected that miR-29b is not only sufficient but also necessary for determining the differential effects of S100A7 in breast cancer cells.