GPR68 and invasive ductal breast carcinoma: In-silico data, as well as the mRNA and protein expression of GPR68, revealed a strong expression in the triple-negative adenocarcinoma MDA-MB-231 cell line, followed by the luminal A MCF-7 cell line, and Her2+ SKBr3, with the lowest expression existing in the invasive ductal carcinoma triple-negative BT-549 cell line.