Indeed, significant associations of NAT2 acetylation genotypes to lung cancer risk were obtained from non-smoking women Chinese women [13,22], and not on male smokers which were mainly the case subjects in several studies (for example, 7 studies with 76–100% males and 89–100% smokers in lung cancer cases [8,9,11,14,16,19,21]). This evidence concerns the gene NAT2 and lung carcinoma.