The 2677 G>A/T leading to amino acid change from alanine to serine or threonine in ABCB1 protein had shown a trend of association with tumour stage in gastric cancer patients (P = .0813) and demonstrated significant association with tumour differentiation in colorectal cancer patients (P < .05).26, 27. The gene discussed is ABCB1; the disease is gastric cancer.