GAS6 and neoplasm: This trend of greater expression in tumour than in normal tissue was confirmed by western blot on whole cell lysates of a panel of human ovarian cell lines where, apart from the OVCAR3 cell line, all the ovarian carcinoma cell lines IGROV1, SKOV3, A2780 (all serous), and the TOV112D (endometrioid) and the TOV21G (clear cell) cell lines displayed elevated GAS6 expression compared to the two human ovarian epithelial cell lines (nontumour origin) HOSE6.3 and HOSE17.1 (Figure 1(b)).