Association between a cytochrome P450 CYPIA1 genotype and incidence of lung cancer.

We analysed 267 samples from patients with lung cancer and 54 samples from patients with pancreatic cancer and classified them into three types (A, B and C) based on their P450CYPIA1 genotypes. This was performed by restriction fragment length polymorphism (RFLP) analysis of DNA (that had been amplified) using the polymerase chain reaction (PCR). Our results reconfirmed previous studies with RFLP analyses by revealing significantly higher frequencies of C type in lung cancer patients, particularly light smokers with squamous cell carcinoma (p < 0.001). Also when we compared the appearance rate of P450CYPIA1 genotype in lung cancer patients between metastasis group and no metastasis group, lymph node or distant metastasis was more frequently observed among the patients of squamous cell carcinoma, especially the light smoking group, with C genotypes (p < 0.05). These results suggested that this genotype is not only associated with the etiology of lung cancer but also with the status of metastasis. Furthermore, genotyping could be useful in predicting the incidence of lung cancer in the smokers and the general population as well as the prognosis of individuals who develop this disease.