Polymerase Chain Reaction (PCR) and Restriction Fragment Length Polymorphism (RFLP) methods were used to measure DNA damage repair gene XPC and folate metabolism enzyme gene MTHFR polymorphisms.
英
美
- 對照組選自同期居住在揚中境內的居民，與病例按性別和年齡組進(jìn)行成組頻數匹配，要求身體健康，無(wú)惡性腫瘤及胃和十二指腸潰瘍病史，征得同意后采集靜脈血并進(jìn)行流行病學(xué)問(wèn)卷調查。
