GRPR and ovarian cancer: The most studied GPCRs in the context of ovarian cancer are the somatostatin (SSTR1–5) [186,187,188,189], cholecystokinin (CCKAR/CCKBR) [190,191], gastrin-releasing peptide (GRPR) [192,193,194], luteinizing hormone-releasing hormone (LHRHR) [195,196] and neurotensin receptors (NTSR1/2) [197].