CYP1B1 and head and neck squamous cell carcinoma: Among the four genes and flanking regions––one haploblock, ACTTGATC in the 5′ portion of CYP1B1, retained statistical significance after 100,000 permutations (P = 0.0042); among our study population, this haploblock was found in 36.4% of African-American, but only 1.49% of Caucasian, HNSCC chromosomes.