Validation of the Point-EXACCT method in non-small cell lung carcinomas.
K-ras point mutations are often detected in part of the lung carcinomas. For the validation of a highly sensitive and rapid assay for known point mutations, Point-EXACCT (Biochim Biophys Acta 1998; 1379:42-52), we analyzed 89 non-small cell lung carcinomas and compared the results with two sequencing methods. No point mutations were found with double-stranded sequencing. Single-stranded sequencing detected six patients positive for K-ras codon 12. When Point-EXACCT was used, K-ras codon 12 mutations were detected in 8 of 52 patients with squamous cell carcinomas, 10 of 29 patients with adenocarcinomas, and 3 of 8 patients with large cell carcinomas. The finding of K-ras mutations in squamous cell carcinomas is explained by the high sensitivity of the method. Therefore, Point-EXACCT may be applicable to detection of those alterations occurring at a low frequency among an excess of cells with wild-type DNA.
Somers
V A
VA
Department of Pathology, Maastricht University, The Netherlands. VSO@lpat.azm.nl
Leimbach
D A
DA
Theunissen
P H
PH
Murtagh
J J
JJ
Holloway
B
B
Ambergen
A W
AW
Thunnissen
F B
FB
D002289:Carcinoma, Non-Small-Cell Lung / Q000235:genetics*; D004252:DNA Mutational Analysis / Q000379:methods; D004273:DNA, Neoplasm / Q000235:genetics; D005260:Female; D011905:Genes, ras; D006801:Humans; D008175:Lung Neoplasms / Q000235:genetics*; D008297:Male; D021141:Nucleic Acid Amplification Techniques; D017354:Point Mutation; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity
D004273:DNA, Neoplasm