ABCG2 and gastric cancer: Among the 72 GC cases, higher expression of ABCG2 presented significant inclination towards larger tumor size (P < 0.05), deeper local invasion (P < 0.05), more lymph node metastasis (P < 0.05) and advanced TNM stage (P < 0.05), while it had no significant correlation between ABCG2 and patients’ age, gender, tumor location.