Purpose:To evaluate the effects of p53 overexpression on the balance of in situ T helper cell 1 with T helper cell 2 in colorectal adenomas and carcinomas, with further study of the immunological mechanism of p53 overexpression stimulating colorectal cancer formation.Methods:Endoscopic colorectal mucosal biopsies were taken from 68 patients with colorectal tumors,including adenomas(n=30) and carcinomas(n=38),and their normal mucosas served as control(NS,n=68).Paraffin sections were examined immunohistochemically for p53 protein overexpression and four cytocine(IL-2,IL-4,IL-10,IFN-r) levels were detected by enzyme linked immunosorbent assay(ELISA) with the culture supernatants of colorectal tissue.Results:IL-2 and IFN-r levels in culture supernants of the positive group were significantly lower (P0.05).Conclusions:p53 overexpression induced inbalance of in situ Th1 with Th2 levels,shown as a drift from Th1 toTh2.p53 gene inactivation may play an critical role in immunological mechanism of colorectal carcinoma carcinogenesis.

Objective To study the clinical value of serum SA,EMA and GPDA in the diagnosis of gastric cancer.Methods To detect serum SA,EMA and GPDA in 30 patients with gastric cancer patients,25 patients with gastric precancerous lesions and 35 patients with non-atrophic gastritis with electronic gastroscope and pathological examination confirmed,compared the differences betwwen the groups,and analyze the relationship between the expressions of them and clinical biology of gastric carcinoma.Results The serum concentrations of SA and GPDA in gastric carcinoma are remarkably higher than those in non-atrophic gastritis and gastric precancerous lesions(P0.05).The concentrations of GPDA in non-atrophic gastritis group are age-related(P0.05).Conclusion It has an important reference value for the diagnosis of gastric cancer to detect serum SA and GPDA.SA and GPDA together can improve the accuracy of the diagnosis of gastric cancer.EMA serum possibly has no diagnostic value for gastric cancer.The expressions of SA,GPDA in serum are related to the biology behaviors of gastric carcinoma,and the concentrations of SA,GPDA in serum is helpful in judging metastasis and recrudescence,and monitoring prognosis.