Table 1

Frequency of positive MAPK immunostaining cases in ovarian serous tumors.

Tumor typeCase no.MAPK+ n (%)P
High-grade serous carcinoma14058 (41)]]<0.001
Low-grade serous carcinoma1613 (81)
Serous borderline tumor
 Intraepithelial low-grade serous carcinoma1512 (80)
 Atypical proliferative serous tumor75 (71)