K-RAS MUTATIONS AND MICROSATELLINE INSTABILITY IN BRONCHOGENIC CARCINOMA
Abstract
MICROSATELLITE INSTABILITY (MI), LOSS OF HETEROZYGOCITY(LOH) AND K-RAS MUTATIOS ARE DEFECTED IN LUNG CANCER SPECIMENS. HOWEVER, THEIR IMPORTANCE TUMORIGENESIS REMAINS UNKNOWN. THE AIM OF THIS STUDY WAS TO IDEHTIFY THE PRESENCE OFMI, LOH AND K-RAS MUTATIONS IN NON-SMALL-CELL LUNG CARCINOMA (NSCLC). METHODS: WE PERFORMED BIOPSIES FROM THE TUMOR AND FORM THE OPPOSITE SITE NORMAL BRONCHIAL MUCOSA IN 20 PATIENTS WITH NSCLC. ALL PAIRED SPECIMENTS WERE STUDIEDUSING PCR TECHNIQUE FOR MI AND LOH ON CHROMOSOMES 17P, 17Q, 9P, 9Q, WITH TEN POLYMORPHIC MARKETS. TUMOR DNA WAS ALSO STUDIED FOR K-RAS MUTATIONS. RESULTS: FROM 20 PAIRED SPECIMENTS, GENETIC ALTERATIONS WERE FOUND IN 16 TUMORS (80%). ELEVEN TUMORS (55%) EXHIBITED MI WHILE 10 TUMORS(50%) EXHIBITED LOH. THE MOST FREQUENT INCIDENCE OF LOH WAS FOUND FOR THE 17Q21, WHEREAS OF MI WAS 17P. K-RAS MUTATONS IN CODON 12 WERE 8/20 (40%), 6 OF THEM DISPLAYED MI CONCURRENTLY (ODD RATIO=4.2). CONCLUSION: MI, LOH AND K- ...
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