Genetic susceptibility to esophageal cancer due to CYP1A1 gene variant rs4646903 in tobacco addicted patients of Pashtun ethnicity: a case control study in Khyber Pakhtunkhwa province of Pakistan. - Zakiullah; Saeed M; Ali S; Javed N; Khisroon M; Muhammad B; Khuda F; Ahmad S; Ismail M (Asian Pacific journal of cancer prevention : APJCP, 2014)