PTP4A1 and breast cancer: Flores‐Pérez et al. 12 reported that miR‐944 expression was significantly silenced in clinical specimens and breast cancer cell lines, and miR‐944 promoted cell migration through targeting of siah E3 ubiquitin protein ligase 1 (SIAH1) and protein tyrosine phosphatase type IVA, member 1 (PTP4A1).