No significant difference was found between the fast-acetylator incidence of NAT2 haplotype and the onset risk of acute lymphoblastic leukemia (ALL, OR=0.70, 95% CI=0.45-1.08) or acute myeloid leukemia (AML, OR=0.79, 95% CI=0.46-1.47).
This study aimed to evaluate the impact of the CYP3A5 and NAT2 metabolizing enzyme polymorphisms on the risk of childhood acute lymphoblastic leukemia.
When NAT2 slow acetylators were considered together with the other risk-elevating genotypes, GSTM1 null and CYP1A1*2A, the risk of ALL increased further, which showed that the combination of these genotypes is more predictive of risk then either of them independently.
The NAT2 slow-acetylator, CYP1A1*2A and GSTM1 null genotypes were shown to be significant risk determinants of ALL (OR=1.6, 1.8 and 1.8, respectively), whereas, polymorphisms in CYP2D6 and GSTT1 genes did not seem to play an important role in the aetiology of ALL.