REG4 and serous adenocarcinoma: Expression of REG4 mRNA was also higher in mucinous benign tumors than serous benign tumors (P = 0.03; Fig. 4b), and in mucinous carcinoma than serous carcinoma (P < 0.001; Fig. 4b), and in well- and moderately-differentiated compared to poorly-differentiated carcinomas (P = 0.011; Fig. 4c); however, there was no correlation between REG4 mRNA expression and FIGO staging (R^2 = 0.022, P = 0.225; Fig. 4d), and between REG4 mRNA expression and age (P = 0.06; Additional file 1: Table S2).