The acetylation phenotype was determined, by means of sulfamethazine measurement, in 87 patients (83 male) with confirmed bronchogenic carcinoma and in 93 healthy control patients (41 male) of equal ages. 48 patients and 54 controls were classified as being "slow acetylators" (Ch2 n.s.) When the persons were individually analysed by phenotype, it was confirmed that the patients showed a significantly lower rate of acetylated sulfamethazine than the control group (p less than 0.02), owing to the poor acetylation of patients with small-cell lung cancer. This difference should be confirmed by more detailed pharmacokinetic studies before regarding it as a possible interference of paraneoplasic type. The polymorphism acetylator cannot be considered a genetic marker related to the risk of having lung cancer.
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