Table 1.

Distribution of NAT2 haplotypes and their gene product acetylator phenotype in 502 breast cancer patients

Acetylator phenotype			Haplotype	References
Status	No.	%
Fast	24	4.8	NAT2*4/NAT2*4	31–34
Intermediate	158	31.5	All intermediate	14
	148	93.7	NAT2*4/-	35
	10	6.3	NAT2*12a/-
Slow	320	63.7	All slow	14,33,36
	81	24.6	NAT2*5b/NAT2*5b
	139	43.4	NAT2*5b/NAT2*6a
	37	11.2	NAT2*5b/-	14,31–33,36
	43	13.1	NAT2*6a/NAT2*6a
	18	6.1	NAT2*6a/-	14,36,37
	2	3.3	NAT2*5c/-

-, any other haplotype yielding heterozygosity; NAT, N-acetyltransferase.