A prospective study of green tea consumption and oral cancer incidence in Japan.
OBJECTIVE
To examine the relation of green tea consumption with oral carcinogenesis, we prospectively analyzed data from a nationwide large-scale cohort study in Japan.


METHODS
A total of 20,550 men and 29,671 women aged 40-79 years, without any history of oral and pharyngeal cancer at baseline survey, were included in the present study. During a mean follow-up period of 10.3 years, 37 oral cancer cases were identified. The Cox proportional hazard model was used to estimate the hazard ratio (HR) and 95% confidence interval (95% CI) for oral cancer according to green tea consumption by sex, while adjusting for age, smoking, alcohol drinking, and other dietary factors.


RESULTS
For women, the HRs of oral cancer for green tea consumption of 1-2, 3-4, and 5 or more cups per day were 0.51 (95% CI: 0.10-2.68), 0.60 (95% CI: 0.17-2.10), and 0.31 (95% CI: 0.09-1.07), respectively, compared with those who drank less than one cup per day (p for trend, 0.08). For men, no such trends were observed.


CONCLUSIONS
Our findings did not suggest a prominent inverse association of green tea consumption with oral cancer, although there was a tendency for a reduced risk in women.
Ide
Reiko
R
Department of Clinical Epidemiology, Institute of Industrial Ecological Sciences, University of Occupational and Environmental Health, Kitakyusyu, Japan. r-ochide@med.uoeh-u.ac.jp
Fujino
Yoshihisa
Y
Hoshiyama
Yoshiharu
Y
Mizoue
Tetsuya
T
Kubo
Tatsuhiko
T
Pham
Truong-Minh
TM
Shirane
Kiyoyumi
K
Tokui
Noritaka
N
Sakata
Kiyomi
K
Tamakoshi
Akiko
A
Yoshimura
Takesumi
T
D000328:Adult; D000368:Aged; D015331:Cohort Studies; D005260:Female; D006801:Humans; D007564:Japan / Q000453:epidemiology; D008297:Male; D008875:Middle Aged; D009062:Mouth Neoplasms / Q000453:epidemiology*; D016016:Proportional Hazards Models; D011446:Prospective Studies; D012307:Risk Factors; D013662:Tea / Q000009:adverse effects
D013662:Tea