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Increased p53 protein content of colorectal tumours correlates with poor survival.
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MedLine Citation:
PMID:  1419618     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Allelic losses on the short arm of chromosome 17 occur frequently in colorectal cancers. Despite the existence of other common molecular events such as loss of the long arms of chromosomes 18 and 5, it has been demonstrated that the former has the greatest prognostic significance. Of the various genes mapping to the commonly deleted sequence, the best candidate as a 'target' seems to be the p53 antioncogene. We applied our methods of detection of the p53 protein in a series of 78 colorectal cancers stored in a tumour bank from 1985 to 1989, for which the median follow-up was 42 months. Nuclear-attached p53 was quantified by flow cytometry and soluble p53 was assayed by ELISA. Both assays used a monoclonal antibody considered to be specific for a conformational epitope present only on the mutated protein. Fifty of the 78 tumours (64%) were found to present significant levels of p53 attached to the nucleus. A further two tumours contained high levels of p53 only in their soluble fraction. Thus, 52 out of 78 cancers (67%) were considered to be positive for p53. The p53 content correlated with 17p loss (P < 0.002), hyperdiploid DNA content (P < 0.001) and tumour site (P < 0.03), but not Dukes' stage (P = 0.15). p53 negative cases had a better overall survival than p53 positive ones (P < 0.03). When the 14 stage D tumours were excluded from the analysis, p53 was no longer significantly predictive of survival (P < 0.07), but remained predictive of recurrence (P < 0.02) and metastasis (P < 0.03). Multivariate analysis was not performed because of the small number of cases. Overall, disease-free and metastasis-free survival were compared to the positivity obtained either with pAb 421 and/or 1801 or pAb 240 since all three were used in the flow cytometric analysis, defining subsets of 421-, 1801+ and 421-, 1801-, 240+. The presence of nuclear protein presenting the mutation-specific epitope, recognised by pAb 240, was found to be the most discriminant. It must be noted that univariate survival analysis demonstrated that more than 80% of patients with p53-negative tumours were alive at 3 years vs less than 50% in the p53-positive group. A large prospective study should be conducted to define the exact prognostic significance of the p53 content of colorectal carcinomas.
Authors:
Y Remvikos; O Tominaga; P Hammel; P Laurent-Puig; R J Salmon; B Dutrillaux; G Thomas
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  British journal of cancer     Volume:  66     ISSN:  0007-0920     ISO Abbreviation:  Br. J. Cancer     Publication Date:  1992 Oct 
Date Detail:
Created Date:  1992-12-01     Completed Date:  1992-12-01     Revised Date:  2010-09-07    
Medline Journal Info:
Nlm Unique ID:  0370635     Medline TA:  Br J Cancer     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  758-64     Citation Subset:  IM    
Affiliation:
Laboratoire de Radiopathologie, URA 620, Institute Curie, Paris, France.
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MeSH Terms
Descriptor/Qualifier:
Adenocarcinoma / chemistry*,  mortality
Cell Nucleus / chemistry
Colorectal Neoplasms / chemistry*,  mortality
DNA, Neoplasm / analysis
Enzyme-Linked Immunosorbent Assay
Humans
Prognosis
Sensitivity and Specificity
Survival Analysis
Tumor Suppressor Protein p53 / analysis*
Chemical
Reg. No./Substance:
0/DNA, Neoplasm; 0/Tumor Suppressor Protein p53
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

Full Text
Journal Information
Journal ID (nlm-ta): Br J Cancer
ISSN: 0007-0920
ISSN: 1532-1827
Article Information
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Print publication date: Month: 10 Year: 1992
Volume: 66 Issue: 4
First Page: 758 Last Page: 764
ID: 1977434
PubMed Id: 1419618

Increased p53 protein content of colorectal tumours correlates with poor survival.
Y. Remvikos
O. Tominaga
P. Hammel
P. Laurent-Puig
R. J. Salmon
B. Dutrillaux
G. Thomas
Laboratoire de Radiopathologie, URA 620, Institute Curie, Paris, France.



Article Categories:
  • Research Article


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