Expression of DCC protein in colorectal tumors and its relationship to tumor progression and metastasis.

Abstract:

:A loss of heterozygosity (LOH) at the DCC gene locus was detected in colorectal tumors, and this LOH might be related to metastasis. The aim of this study was to determine DCC protein expression in colorectal cancer and to evaluate its prognostic value. Allelic loss of the DCC locus was observed in 16 of the 23 patients (66.7%). In all 16 patients with LOH, DCC expression was decreased in the cancer tissue compared with the adjacent normal mucosa. All 23 colorectal tumors had decreased expression of this protein relative to the adjacent normal colonic mucosa in Western blot analysis. The levels of DCC protein were significantly lower in cancer tissues than in adenoma tissues. Decreased DCC protein expression was also observed by immunohistochemistry in the colorectal cancer cases. There were significant correlations between DCC protein expression and histologic type, venous invasion, and hematogenous metastasis. Patients with DCC-protein-negative tumors had a greater relative risk of recurrence compared with those whose tumors were DCC protein-positive. The 5-year survival rate was 91.0% in patients with DCC-protein-positive tumors, and 58.8% in those with DCC-protein-negative tumors; these differences between the two groups of patients were significant (p < 0.01). In multivariate analysis using the Cox regression model, DCC protein expression emerged as an independent prognostic indicator. These findings suggested that a decrease in DCC expression may have an important role in the progression of colorectal cancers and may be a biologic marker of prognostic significance.

journal_name

Oncology

journal_title

Oncology

authors

Saito M,Yamaguchi A,Goi T,Tsuchiyama T,Nakagawara G,Urano T,Shiku H,Furukawa K

doi

10.1159/000011954

subject

Has Abstract

pub_date

1999-01-01 00:00:00

pages

134-41

issue

2

eissn

0030-2414

issn

1423-0232

pii

11954

journal_volume

56

pub_type

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