OLFM4 and ERα expression in SKOV3 cells, a moderately-differentiated ovarian serous adenocarcinoma cell line, was higher than the expression in HO8910-pm, a poorly-differentiated ovarian serous adenocarcinoma cell line (Figure 4), further suggesting the correlation of OLFM4 expression with ERα expression and degree of tumor differentiation. This evidence concerns the gene OLFM4 and ovarian serous adenocarcinoma.