GPR55 and cancer: These data are in accordance with previous studies in which LPI has been found to activate GPR55 in DRGs (Lauckner et al., 2008), osteoclasts (Whyte et al., 2009), lymphoblastoid cells (Oka et al., 2010), cancer cell proliferation (Andradas et al., 2011), and hippocampal slices (Sylantyev et al., 2013).