Document Detail

Correlation of p53 over-expression and alteration in p53 gene detected by polymerase chain reaction-single strand conformation polymorphism in adenocarcinoma of gastric cancer patients from India.
MedLine Citation:
PMID:  19294769     Owner:  NLM     Status:  MEDLINE    
AIM: To study the alterations in p53 gene among Indian gastric cancer patients and to correlate them with the various clinicopathological parameters.
METHODS: A total of 103 gastric cancer patients were included in this study. The p53 alterations were studied by both immunohistochemical method as well as polymerase chain reaction (PCR)-single strand conformation polymorphism (SSCP) analysis. We only studied four (exon 5, 6, 7, and 8) of the 11 p53 exons. The alterations in p53 were also correlated with respect to various clinicopathological parameters.
RESULTS: Among 103 cases, p53 over-expression and alteration were detected in 37 (35.92%) and 19 (18.44%) cases, respectively. Most of the p53 alterations were found at exon 5 (31.54%), followed by exon 6 (26.31%), exon 7 (21.04%) and exon 8 (21.04%). A significant correlation of p53 over-expression was found with p53 alteration (P = 0.000). Concordance between p53 alteration (as detected by SSCP) and over-expression [as detected by immunohistochemistry (IHC)] was found in 75% cases. We found that IHC-positive/SSCP-negative cases accounted for 21% of cases and IHC-negative/SSCP-positive cases accounted for remaining 4% cases.
CONCLUSION: Our results show that p53 gene mutations are significantly correlated with p53 protein over-expression, with 75% concordance in over-expression and alteration in the p53 gene, but 25% disconcordance also cautions against the assumption that p53 over-expression is always associated with a gene mutation. There may be other mechanisms responsible for stabilization and accumulation of p53 protein with no evidence of gene mutation that reflect an accumulation of a non-mutated protein, or a false negative SSCP result.
Sajjad Karim; Arif Ali
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  World journal of gastroenterology : WJG     Volume:  15     ISSN:  2219-2840     ISO Abbreviation:  World J. Gastroenterol.     Publication Date:  2009 Mar 
Date Detail:
Created Date:  2009-03-18     Completed Date:  2009-05-20     Revised Date:  2014-05-20    
Medline Journal Info:
Nlm Unique ID:  100883448     Medline TA:  World J Gastroenterol     Country:  China    
Other Details:
Languages:  eng     Pagination:  1381-7     Citation Subset:  IM    
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MeSH Terms
Adenocarcinoma / genetics*
DNA, Neoplasm / genetics,  isolation & purification
Exons / genetics*
Gastric Mucosa / physiology,  physiopathology
Gene Amplification
Gene Expression Regulation, Neoplastic*
Genes, p53*
Polymerase Chain Reaction / methods*
Polymorphism, Single-Stranded Conformational
Reference Values
Stomach / physiology,  physiopathology
Stomach Neoplasms / genetics*
Tumor Suppressor Protein p53 / genetics*
Reg. No./Substance:
0/DNA, Neoplasm; 0/Tumor Suppressor Protein p53

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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