GPR55 and cancer: It has also been reported that CB2R and GPR55 are overexpressed in many of cancer types (Henstridge et al., 2011; Velasco et al., 2012), where they are crucial for the regulation of the cell fate (Henstridge et al., 2011; Andradas et al., 2011; Piñeiro et al., 2011; Velasco et al., 2012; Pérez-Gómez et al., 2013).