Pentadecanoic acid combined with tamoxifen inhibited survival−associated signaling pathways. (A) KEGG analysis was used to analyze the enrichment of common survival pathways in MCF−7/SC cells compared to those in MCF−7 cells. The levels of proteins related to ERK1/2, MAPK, EGFR, and mTOR signaling compared between MCF−7 and MCF−7/SC (B,C) cells or following pentadecanoic acid or combined treatment for 48 h in MCF−7/SC cells (D,E). β−actin was used as a loading control. The asterisk (*) indicates p < 0.05 vs. the control. The hash mark (#) indicates p < 0.05 when comparing the combined vs. individual treatments. Data are representative of three biologically independent experiments and values are shown in mean ± SD.