Head-and-neck squamous cell carcinoma risk in smokers: no association detected between phenotype and AHR, CYP1A1, CYP1A2, or CYP1B1 genotype

Table 11 Detailed studies of chromosomal frequencies of CYP1B1 haplotype ACTTGATC in haploblock 2

Caucasians (EUR) and Africans (AFR) in The 1000 Genomes Project
	ACTTGATC^*	Other haplotypes	Total chromosomes	Haplotype frequency
EUR	3	1003	1006	0.003
AFR	471	851	1332	0.356
Total	474	1854	2328

^*Statistically significant (P < 0.0001) by Fisher’s exact test, comparing EUR with AFR

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