In current study, the N-acetyltransferases 2 genotypes related with a high-acetylator phenotype commonly observed in bladder cancer patients were WT/WT (46,67%), WT/M1 (25%), WT/M3 (13.33%) and M2/M2 (13.33%) was the genotype most common related with the low-acetylator phenotype. The gene discussed is NAT2; the disease is urinary bladder carcinoma.