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Cancer-preventive effects of drinking green tea among a Japanese population.
Prev Med. 1997 Nov-Dec; 26(6):769-75.PM

Abstract

BACKGROUND

Laboratory studies have revealed the cancer preventive effects of green tea, so the association between green tea consumption and cancer was examined in a human population.

METHODS

The association between green tea consumption and cancer incidence was studied in our prospective cohort study of a Japanese population. We surveyed 8,552 individuals over 40 years of age living in a town in Saitama prefecture on their living habits, including daily consumption of green tea. During the 9 years of follow-up study (71,248.5 person-years), we identified a total of 384 cases of cancer in all sites.

RESULTS

We found a negative association between green tea consumption and cancer incidence, especially among females drinking more than 10 cups a day. The slowdown in increase of cancer incidence with age observed among females who consumed more than 10 cups a day is consistent with the finding that increased consumption of green tea is associated with later onset of cancer. Age-standardized average annual incidence rate was significantly lower among females who consumed large amounts of green tea. Relative risk (RR) of cancer incidence was also lower among both females (RR = 0.57, 95% CI = 0.33-0.98) and males (RR = 0.68, 95% CI = 0.39-1.21) in groups with the highest consumption, although the preventive effects did not achieve statistical significance among males, even when stratified by smoking and adjusted for alcohol and dietary variables.

CONCLUSION

Our epidemiological study showed that green tea has a potentially preventive effect against cancer among humans.

Authors+Show Affiliations

Department of Epidemiology, Saitama Cancer Center Research Institute, Japan.No affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

9388788

Citation

Imai, K, et al. "Cancer-preventive Effects of Drinking Green Tea Among a Japanese Population." Preventive Medicine, vol. 26, no. 6, 1997, pp. 769-75.
Imai K, Suga K, Nakachi K. Cancer-preventive effects of drinking green tea among a Japanese population. Prev Med. 1997;26(6):769-75.
Imai, K., Suga, K., & Nakachi, K. (1997). Cancer-preventive effects of drinking green tea among a Japanese population. Preventive Medicine, 26(6), 769-75.
Imai K, Suga K, Nakachi K. Cancer-preventive Effects of Drinking Green Tea Among a Japanese Population. Prev Med. 1997 Nov-Dec;26(6):769-75. PubMed PMID: 9388788.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Cancer-preventive effects of drinking green tea among a Japanese population. AU - Imai,K, AU - Suga,K, AU - Nakachi,K, PY - 1997/12/6/pubmed PY - 1997/12/6/medline PY - 1997/12/6/entrez SP - 769 EP - 75 JF - Preventive medicine JO - Prev Med VL - 26 IS - 6 N2 - BACKGROUND: Laboratory studies have revealed the cancer preventive effects of green tea, so the association between green tea consumption and cancer was examined in a human population. METHODS: The association between green tea consumption and cancer incidence was studied in our prospective cohort study of a Japanese population. We surveyed 8,552 individuals over 40 years of age living in a town in Saitama prefecture on their living habits, including daily consumption of green tea. During the 9 years of follow-up study (71,248.5 person-years), we identified a total of 384 cases of cancer in all sites. RESULTS: We found a negative association between green tea consumption and cancer incidence, especially among females drinking more than 10 cups a day. The slowdown in increase of cancer incidence with age observed among females who consumed more than 10 cups a day is consistent with the finding that increased consumption of green tea is associated with later onset of cancer. Age-standardized average annual incidence rate was significantly lower among females who consumed large amounts of green tea. Relative risk (RR) of cancer incidence was also lower among both females (RR = 0.57, 95% CI = 0.33-0.98) and males (RR = 0.68, 95% CI = 0.39-1.21) in groups with the highest consumption, although the preventive effects did not achieve statistical significance among males, even when stratified by smoking and adjusted for alcohol and dietary variables. CONCLUSION: Our epidemiological study showed that green tea has a potentially preventive effect against cancer among humans. SN - 0091-7435 UR - https://www.unboundmedicine.com/medline/citation/9388788/Cancer_preventive_effects_of_drinking_green_tea_among_a_Japanese_population_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0091-7435(97)90242-5 DB - PRIME DP - Unbound Medicine ER -