A prospective study of green tea consumption and cancer incidence, Hiroshima and Nagasaki (Japan)

Jun Nagano, S. Kono, D. L. Preston, K. Mabuchi

Research output: Contribution to journalArticle

141 Citations (Scopus)

Abstract

Objectives: Laboratory and animal studies have shown a protective effect of green tea on cancer of different sites, but epidemiological evidence is limited and inconclusive. This prospective study in Japan examined the association between green tea consumption and cancer incidence. Methods: Subjects were 38,540 people (14,873 men, mean age 52.8 years; 23,667 women, mean age 56.8 years) who responded to a mail survey carried out between 1979 and 1981. A self-administered questionnaire ascertained consumption frequency of green tea using precoded answers (never, once per day, twice to four times per day, and five or more times per day). Follow-up continued until 31 December 1994. The study analyzed solid cancers (n = 3881); hematopoietic cancers (188); cancers of all sites combined (4069); and cancer of specific sites with more than 100 cases, i.e. stomach (901), colon (432), rectum (193), liver (418), gallbladder (122), pancreas (122), lung (436), breast (281), and bladder (122). Poisson regression was used to allow for city, gender, age, radiation exposure, smoking status, alcohol drinking, body-mass index, education level, and calendar time. Results: Green tea consumption was virtually unrelated to incidence of cancers under study. The relative risks of all cancers for those consuming green tea twice to four times per day and five or more times per day were 1.0 (95% confidence interval 0.91-1.1) and 0.98 (0.88-1.1), respectively, as compared with those consuming green tea once per day or less. Conclusion: Our findings do not provide evidence that regular green tea consumption is related to reduced cancer risks.

Original languageEnglish
Pages (from-to)501-508
Number of pages8
JournalCancer Causes and Control
Volume12
Issue number6
DOIs
Publication statusPublished - Jan 1 2001
Externally publishedYes

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Tea
Japan
Prospective Studies
Incidence
Neoplasms
Laboratory Animals
Postal Service
Gallbladder
Rectum
Alcohol Drinking
Pancreas
Stomach
Colon
Urinary Bladder
Breast
Body Mass Index
Smoking
Confidence Intervals
Education
Lung

All Science Journal Classification (ASJC) codes

  • Oncology
  • Cancer Research

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A prospective study of green tea consumption and cancer incidence, Hiroshima and Nagasaki (Japan). / Nagano, Jun; Kono, S.; Preston, D. L.; Mabuchi, K.

In: Cancer Causes and Control, Vol. 12, No. 6, 01.01.2001, p. 501-508.

Research output: Contribution to journalArticle

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abstract = "Objectives: Laboratory and animal studies have shown a protective effect of green tea on cancer of different sites, but epidemiological evidence is limited and inconclusive. This prospective study in Japan examined the association between green tea consumption and cancer incidence. Methods: Subjects were 38,540 people (14,873 men, mean age 52.8 years; 23,667 women, mean age 56.8 years) who responded to a mail survey carried out between 1979 and 1981. A self-administered questionnaire ascertained consumption frequency of green tea using precoded answers (never, once per day, twice to four times per day, and five or more times per day). Follow-up continued until 31 December 1994. The study analyzed solid cancers (n = 3881); hematopoietic cancers (188); cancers of all sites combined (4069); and cancer of specific sites with more than 100 cases, i.e. stomach (901), colon (432), rectum (193), liver (418), gallbladder (122), pancreas (122), lung (436), breast (281), and bladder (122). Poisson regression was used to allow for city, gender, age, radiation exposure, smoking status, alcohol drinking, body-mass index, education level, and calendar time. Results: Green tea consumption was virtually unrelated to incidence of cancers under study. The relative risks of all cancers for those consuming green tea twice to four times per day and five or more times per day were 1.0 (95{\%} confidence interval 0.91-1.1) and 0.98 (0.88-1.1), respectively, as compared with those consuming green tea once per day or less. Conclusion: Our findings do not provide evidence that regular green tea consumption is related to reduced cancer risks.",
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