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[Amplification of the expression of the c-myc oncogene in bronchial epidermoid carcinoma in man].

Squamous cell lung carcinomas from 10 untreated patients were examined for the state of the oncogene c-myc. Blot hybridization experiments have demonstrated the amplification of the oncogene of about six fold in only one tumor. The oncogene amplification was not detected in normal tissues of patients. The analysis of RNA by Northern blot revealed the presence in the seven tumors examined of a 2.4 kb c-myc RNA band. The level of c-myc expression evaluated by dot blot analysis was 5 to 14 fold greater in tumors than that of histologically normal lung of the same patients.