ESR1 and ovarian neoplasm: Considering that OVCAR‐3 cells do express both ERα and ERβ isoforms, and that expression of the ESR2 (ERβ) gene was also found elevated in microdissected ovarian tumor stroma compared to normal sections (Fig. S2A), we thus analyzed the respective contribution of ERα and ERβ in regulating CXCR7 gene in OC cells.