RACGAP1P1 and breast cancer: To further evaluate the function of RACGAP1P in breast cancer, we stably overexpressed RACGAP1P in MDA‐MB‐231 breast cancer cells (MDA‐MB‐231 RACGAP1P) and MCF7 breast cancer cells (MCF7 RACGAP1P), verified by qRT‐PCR (Fig. 2A).