Pesquisa de mutações nos genes p53 e K-ras em pacientes com carcinoma bronquico atendidos no serviço de oncopneumologia FCM/UNICAMP

AUTOR(ES)

Mauricio Wesley Perroud Junior

DATA DE PUBLICAÇÃO

2002

RESUMO

Considered a rare illness in the beginning of 20th century, the lung cancer today is the more common visceral neoplasia and the main cause of death by cancer. The study of the molecular events involved in lung cancer is important for the knowledge of the process of carcinogenesis and for the determination of the mutational spectrum of the genes related to lung cancer. In the future we will be able to use the techniques of molecular biology in the early diagnosis, and the correlation between clinical, tumoral and genetic variables will be useful for us to define the factors of prognostic and therapeutic approach. We carried out the study of mutations in the genes p53 and K-ras in patients with lung cancer. In relation to the p53 gene, we have looked for mutations in exons 5 to 10 in 38 patients with non-small cell lung cancer, and in exons 5 to 9 in nine patients with small cell lung cancer. The frequency of mutations was, respectively, 21 and 33%. The analysis of mutations in the K-ras gene was carried out in 8 patients with adenocarcinoma and four with large cell carcinoma. We didn?t find mutations, probably, due to the size of the sample. In patients with non-small cell lung cancer, the presence of mutation in the p53 gene did not correlate with survival (p=0,53), staging (p=0,67) and time of symptoms (p=0,15). We compared the mutations found in the p53 gene with the database kept by the World Health Organization (International Agency for Research on Cancer). Taking into account that the IARC data bank was updated in March/2002 (16,285 entries), we are probably the first group to describe the transversion on codon 237 (ATGàAAG) in bronchial cancer, independent of the histological type and the mutation on codon 337 in large cell cancer (IARC, 2002)

ASSUNTO(S)

cancer - diagnostico traqueia cancer - prognostico biologia molecular ciclo celular oncogenes

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