title: Inverse association between yoghurt intake and upper aerodigestive tract cancer risk in a Japanese population.
abstract: Although the combination of tobacco smoking and alcohol drinking account for approximately 80% of upper aerodigestive tract (UADT) cancer risk, the role of dietary factors, including dairy products, in the risk of these cancers remains controversial. We aimed to evaluate the association between dairy product intake and UADT cancer risk in a Japanese population. We conducted a case-control study in 959 patients with UADT cancer and 2877 sex- and age-matched noncancer control subjects who visited the Aichi Cancer Center in Nagoya, Japan. Data on lifestyle factors, including diet, were obtained by self-administered questionnaire. Associations were assessed by multivariate logistic regression models that considered potential confounders. We found a significant inverse association between yoghurt intake and UADT cancer risk with multivariate-adjusted odds ratios and 95% confidence intervals for <1 time/week, ≥ 1 time/week and <1 time/day, and ≥ 1 time/day consumption of yoghurt of 0.70 (95% confidence interval: 0.54-0.91), 0.67 (0.54-0.84), and 0.73 (0.55-0.95) relative to nonconsumers (P trend=0.005). When stratified by primary tumor site, this association was significant among patients with hypopharyngeal, laryngeal, and esophageal cancer. However, we saw no significant association between milk or butter intake and UADT cancer risk. In this study, we found that a high intake of yoghurt may lower the risk of developing UADT cancer in a Japanese population. Further investigation of this association is warranted.
authors.affiliation: Division of Epidemiology and Prevention, Aichi Cancer Center, Nagoya, Japan.
authors.forename: Daisuke
authors.initials: D
authors.lastname: Kawakita
authors.forename: Fumihito
authors.initials: F
authors.lastname: Sato
authors.forename: Satoyo
authors.initials: S
authors.lastname: Hosono
authors.forename: Hidemi
authors.initials: H
authors.lastname: Ito
authors.forename: Isao
authors.initials: I
authors.lastname: Oze
authors.forename: Miki
authors.initials: M
authors.lastname: Watanabe
authors.forename: Nobuhiro
authors.initials: N
authors.lastname: Hanai
authors.forename: Shunzo
authors.initials: S
authors.lastname: Hatooka
authors.forename: Yasuhisa
authors.initials: Y
authors.lastname: Hasegawa
authors.forename: Masayuki
authors.initials: M
authors.lastname: Shinoda
authors.forename: Kazuo
authors.initials: K
authors.lastname: Tajima
authors.forename: Shingo
authors.initials: S
authors.lastname: Murakami
authors.forename: Hideo
authors.initials: H
authors.lastname: Tanaka
authors.forename: Keitaro
authors.initials: K
authors.lastname: Matsuo
mesh_terms: D000368:Aged; D016022:Case-Control Studies; D004032:Diet / Q000208:ethnology*; D005260:Female; D006258:Head and Neck Neoplasms / Q000208:ethnology*; D006801:Humans; D007564:Japan / Q000453:epidemiology; D008297:Male; D008875:Middle Aged; D018570:Risk Assessment; D015014:Yogurt