LEP and ovarian cancer: A number of studies observed that leptin treatment elicited significant cell growth/proliferation in different ovarian cancer cell lines, e.g., OVCAR-3, SKOV3, A2780, OV-90, and BG-1 cells (Choi et al., 2005; Nkhata et al., 2007; Chen et al., 2013; Ptak et al., 2013[a]; Xu et al., 2013).