MKI67 and ovarian carcinoma: We also assessed mesothelin positivity, a protein expressed in the mesothelial cell lining of the peritoneum which has been described as binding to the ovarian cancer antigen CA125 and being overexpressed in HGSOC [14], as well as the proliferative marker Ki67, which ranged from 50 to 70% in terms of positive nuclear staining (Figure 3).