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International Agency for Research on Cancer, 150 cours Albert Thomas, 69372 Lyon Cedex 08, France [M. C. H., C. G., H. Y., R. M.]; Sylvius Laboratories, University of Leiden, Leiden, The Netherlands [A. M. S., J. L. B.]; Centre Baclesse, Caen, France [A. M.]; and Edouard-Herriot Hospital, Lyon, France [C. P.]
Primary esophageal squamous cell carcinomas from 41 patients were analyzed for the presence of proto-oncogene alterations associated with this malignancy. The occurrence of activating ras gene mutations in 25 tumors was determined using oligomer hybridization of target sequences amplified by polymerase chain reaction. We found no evidence for mutations in codons 12 and 61 of the H-ras, K-ras, and N-ras genes, nor in codon 13 of the K-ras and N-ras loci in any of these tumors. The apparent absence of activated ras oncogene in esophageal cancers represents a possible exception to the presence of these mutations found consistently in numerous other types of human malignancies, and is in striking contrast to the 40% prevalence of ras mutations in human colorectal cancers.
Southern blot hybridization experiments with DNAs from tumors demonstrated amplification of the epidermal growth factor receptor gene (c-erbB) in two of 25 carcinomas. No amplification of the structurally related c-erbB2 (neu) gene was detected. In three out of 12 carcinomas, the level of epidermal growth factor receptor RNA was significantly higher than in normal esophageal mucosal tissue. Our results suggest that enhanced transcription of the epidermal growth factor receptor gene is associated with the development of some esophageal cancers.
1 To whom requests for reprints should be addressed.
Received 3/ 2/88. Revised 6/ 9/88. Accepted 6/15/88.
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