PMID: 8440743Jan 1, 1993Paper

Molecular mechanism of stomach carcinogenesis

Journal of Cancer Research and Clinical Oncology
E Tahara

Abstract

Gene changes in multiple oncogenes, multiple growth factors and multiple tumor-suppressor genes are observed in stomach cancer. Among them, those most commonly implicated in both well-differentiated adenocarcinoma and poorly differentiated adenocarcinoma are inactivation (mutations and allele loss) of the p53 gene, and activation (abnormal expression and amplification) of the c-met gene. Moreover, they occur at an early stage of stomach carcinogenesis. In addition, loss of heterozygosity (LOH) on chromosome 5q (APC locus) is frequently associated with well-differentiated adenocarcinoma. LOH on chromosome 18q (DCC locus) and LOH of the bcl-2 gene also are common events of well-differentiated adenocarcinoma. LOH on chromosomes 1q and 7q may be involved in the progression of well-differentiated adenocarcinoma. Conversely, the development of poorly differentiated adenocarcinoma, in addition to changes in p53 and c-met genes, requires reduction or dysfunction of cadherin. Overexpression of bcl-2 protein is observed in poorly differentiated adenocarcinoma or signet-ring cell carcinoma. Moreover, the K-sam gene is amplified preferentially in poorly differentiated adenocarcinoma of scirrhous carcinoma. K-sam amplification in scirrhous ...Continue Reading

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