Study of mutations of p53, APC and K-ras genes in 47 cases of intestinalmetaplasia of gastric mucosa

ih order to stUdy the role of the mutations of P53,W and K-ras benes in intestine ~la(IM) of metric muare and caxcin~s, the InUtationS of the gene~onto ~ in 3 mp of m were ~nab withPCR-bumP and PCR~~. ..~ ~ SUbjch Folty~five foryhalin-fad and ~ em.~ s~ of ~ and severe iM were colleded in the - ho I%8 to lOp and 15 f- swear fxnm the stallly ~ cases. ~ the co.spe~, 10 were for the ~ of the ~ents with~ ~c diseases and 50 ho the gb~ tissues of~c carcinoma. Serial SectionS were done for the…

Study of mutations of p53, APC and K-ras genes in 47 cases of intestinal metaplasia of gastric mucosa

Objective:To study the role of the mutations of p53, APC and K-ras genes in 47 cases of 3 types of intestinal metaplasia (IM) of gastric mucosa. Methods:In 47 cases of IM, exons 5- 8 of p53 and exons 15 of APC were examined with PCR-SSCP and codon 12 of K-ras with PCR-RFLP to detect the existence of any mutations of these structures. Results:Muta- tions of p53, APC and K-ras were found in 29.8% (14/47),6.4% (3/47) and 6.4% (3/47) respectively in our series of patients who consisted of 33 with types I and II and 14 with type III of IM. The mutation rate of p53 was far higher in patients with type III IM (57.1%,8/14) than in those with types I and II IM(18.2%,6/33)(P <0.05). Though the mutation rate of APC and K-ras was also higher in the patients with type III IM than in those with types I and II IM, it was of no statistical significance (P >0.05). In one case of type III IM, mutation of both p53 and K-ras was found. Conclusion: The molecular changes of 3 types of IM are different. The mutation of p53 may be closely related to carcinogenesis in cases of type III IM and it serve as a sign for the early diagnosis of gastric carcinoma.