GPR55 and ovarian carcinoma: Increased serum levels of the GPR55-ligand LPI have been found in patients with high-grade ovarian carcinoma (Xiao et al., 2000; 2001; Xu et al., 2001; Sutphen et al., 2004; Murph et al., 2007; Pineiro et al., 2011; Pineiro and Falasca, 2012).