PMID: 9419409Jan 7, 1998Paper

Detection of K-ras mutations in resected primary leiomyosarcoma

Cancer Epidemiology, Biomarkers & Prevention : a Publication of the American Association for Cancer Research, Cosponsored by the American Society of Preventive Oncology
M A HillJ D Hunt

Abstract

Mutation of the K-ras oncogene occurs frequently in human malignancy. However, there are few reports concerning K-ras mutations in soft-tissue sarcoma, including leiomyosarcoma. We therefore designed a study to determine the prevalence of mutations in the first exon of K-ras in leiomyosarcoma and to evaluate its prognostic potential. Fifty-one leiomyosarcomas were reviewed, and their diagnoses were confirmed on pathological review. Tissue blocks were retrieved, and new sections were prepared for confirmation of diagnosis. Additional tissue sections were used for DNA isolation. PCR and denaturing gradient gel electrophoresis (DGGE) were used to detect K-ras mutations in the first exon of genomic DNA isolated from the specimens. Seven (14%) K-ras mutations were detected using DGGE. Subsequent sequencing of the K-ras gene from each of the mutated tumors confirmed the DGGE results in each case. The median survival for patients whose tumors did not contain mutations of K-ras was 42 months (n = 42) versus 25 months (n = 7) for those with mutations (P = 0.06). However, patients with stages I and II tumors had a median survival of 82 months (n = 28) compared to 28 months for those with stages III and IV disease (n = 20, P = 0.02). The ...Continue Reading

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