TACR1 and breast carcinoma: The expression levels of miR‐34, NK1R‐FL and NK1R‐Tr were detected in different breast cancer cell lines, including MDA‐MB‐231, MCF‐7, T47D, SK‐BR‐3 and the nontumorigenic mammary epithelial cell line HBL‐100 (Figure 1A,B).