Correlation of genetic instability with mismatch repair protein expression and p53 mutations in non-small cell lung cancer.
To examine the etiological association of genetic instability in lung tumorigenesis, we investigated the frequency of microsatellite instability (MI) of eight dinucleotide repeat markers in 68 patients with non-small cell lung cancer. Twenty-eight patients (41.2%) evidenced instability in multiple tested microsatellite markers ranging from 3-7 and were defined as MI-positive patients. MI occurred more frequently in patients suffering from squamous cell lung carcinoma (P = 0.004). We examined the association between MI and expression of hMLH1 mismatch repair protein by immunohistochemical analysis of hMLH1 protein in paraffin-embedded tumors from 64 patients. Twenty MI-positive patients (76.9%) had no expression of hMLH1 protein. The data showed that MI was associated with altered hMLH1 expression (P = 0.03). To examine the role of genetic instability in the previous identified small intragenic deletion of the p53 gene, we explored the association between MI and p53 gene mutations. All patients, except one, containing small intragenic deletion in p53 gene showed MI (P = 0.018). In addition, we found that MI was not associated with the prognosis. Our data suggest that MI plays a significant role in non-small cell lung cancer tumorigenesis in Taiwan and that MI is associated with the altered expression of hMLH1 mismatch repair protein. In addition, MI may be involved in frequent small intragenic deletions of p53 gene.
Chang
J W
JW
Institute of Toxicology, Chung Shan Medical College, Taichung, Taiwan, Republic of China.
Chen
Y C
YC
Chen
C Y
CY
Chen
J T
JT
Chen
S K
SK
Wang
Y C
YC
D048868:Adaptor Proteins, Signal Transducing; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001483:Base Sequence; D002289:Carcinoma, Non-Small-Cell Lung / Q000235:genetics* / Q000378:metabolism / Q000473:pathology; D002352:Carrier Proteins; D004252:DNA Mutational Analysis; D004273:DNA, Neoplasm / Q000737:chemistry / Q000235:genetics; D005260:Female; D006801:Humans; D007150:Immunohistochemistry; D008175:Lung Neoplasms / Q000235:genetics* / Q000378:metabolism / Q000473:pathology; D008297:Male; D008875:Middle Aged; D000070957:MutL Protein Homolog 1; D009154:Mutation; D009363:Neoplasm Proteins / Q000235:genetics / Q000378:metabolism*; D009687:Nuclear Proteins; D011379:Prognosis; D017384:Sequence Deletion; D016019:Survival Analysis; D016159:Tumor Suppressor Protein p53 / Q000235:genetics*
D048868:Adaptor Proteins, Signal Transducing; D002352:Carrier Proteins; D004273:DNA, Neoplasm; C501486:MLH1 protein, human; D009363:Neoplasm Proteins; D009687:Nuclear Proteins; D016159:Tumor Suppressor Protein p53; D000070957:MutL Protein Homolog 1