MBOAT4 and neoplasm: Additionally, ghrelin expression levels correlated with those of In1-ghrelin (R2 = 0.532; p < 0.01) and GOAT (R2 = 0.422; p < 0.05) in tumor samples, while the expression of GHSR1a was correlated with GHSR1b (R2 = 0.444; p < 0.05).