GCG and polyp of colon: The mRNA expression of GCG was significantly associated with history of colon polyps (yes vs. no: OR = 1.707, 95% confidence interval (CI) = 1.190-2.459, p = 0.004); however, the mRNA expression of GCG was not found to be significantly associated with the other clinical variables except for the variable “history of colon polyps.”