ESR1 and breast carcinoma: Therefore, this study is aimed at investigating the effects of placenta-derived hMSCs (PL-hMSCs) and chorion-derived hMSCs (CH-hMSCs) on proliferation, migration, invasion, and gene expression profiles of two different human breast cancer cells, estrogen receptor-expressing MCF-7 cells and estrogen receptor-negative MDA-MB231 cells.