Keywords Esophageal neoplasms/etiology;Gastric cardiac neoplasms/etiology;Serine hydroxymethyltransferase;Polymorphism;Susceptibility;

• 食管肿瘤/病因学;贲门肿瘤/病因学;丝氨酸羟甲基转移酶;多态性;肿瘤易感性;