Abstract
Purpose
The aim of this study was for the first time to assess the association between glycemic index (GI), glycemic load (GL), and colorectal cancer using a prospective Japanese population-based cohort.
Methods
In our study participants aged 40–69 at baseline of the Japan Public Health Center-based prospective Study (JPHC Study) in 10 prefectural public health centers (PHC) were included. Subjects responding to the five-year follow-up survey (1995–1999) without previous history of cancer and missing data were included in the current analysis n = 73,501 (men n = 34,560 and women n = 38,941). We reported results as hazard ratios (HR) and 95 % confidence intervals (CI) by Cox proportional hazards modeling.
Results
The average follow-up time was 12.5 years (919,276 person-years). A total of 1,468 colorectal cancer cases were detected. Overall, no significant results were observed; however, GL was inversely nonsignificantly associated with colon cancer in men HR = 0.74 (95 % CI 0.51–1.09) and rectal cancer in women 0.52 (95 % CI 0.24–1.14). The GL tended to be inversely associated with proximal colon cancer among men 0.62 (95 % CI 0.36–1.08), while a positive association with the GI was observed among women 1.37 (95 % CI 0.88–2.14). Sensitivity analyses excluding the first three years of observation showed similar results. Results stratified by diabetes status, BMI, smoking and red meat were nonsignificant.
Conclusions
In conclusion, the prospective JPHC Study suggests that the GI and GL do not have a substantial impact on the risk of colorectal cancer in Japanese adults.
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Acknowledgments
We are indebted to the Iwate, Ibaraki, Niigata, Osaka, Kochi, Nagasaki, and Okinawa Cancer Registries for providing their incidence data. Thanks to Dr. Akiko Nanri and Dr. Azusa Hara on advice regarding the nutrition variables and Dr. Shino Oba on providing the GI and GL for each participant.
Funding
This study was supported by National Cancer Center Research and Development Fund (23-A-31[toku] and 26-A-2) (since 2011), a Grant-in-Aid for Cancer Research from the Ministry of Health, Labour and Welfare of Japan (from 1989 to 2010).
Authors Contributions
SKA analyzed the data, generated the tables and drafted the manuscript including the introduction and discussion. MI* designed the study and checked the paper for consistency. NS made substantial contributions to the intellectual content, particularly to the discussion. JI contributed to the GI/GL methodology and limitations section. MI and TS provided valuable critical discussion regarding validity of the study. SS, TY, and ST checked the paper.
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Manami Inoue is the beneficiary of a financial contribution from the AXA Research fund as chair holder of the AXA Department of Health and Human Security, Graduate School of Medicine, The University of Tokyo. The AXA Research Fund had no role in the design, data collection, analysis, interpretation or manuscript drafting, or in the decision to submit the manuscript for publication. The authors declare no other conflicts of interest.
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For the JPHC Study Group.
Study group members are listed in “Appendix.”
Appendix
Appendix
Members of the Japan Public Health Center-based Prospective Study (JPHC Study, principal investigator: S. Tsugane) Group are: S. Tsugane, N. Sawada, M. Iwasaki, S. Sasazuki, T. Yamaji, T. Shimazu, and T. Hanaoka, National Cancer Center, Tokyo; J. Ogata, S. Baba, T. Mannami, A. Okayama, and Y. Kokubo, National Cerebral and Cardiovascular Center, Osaka; K. Miyakawa, F. Saito, A. Koizumi, Y. Sano, I. Hashimoto, T. Ikuta, Y. Tanaba, H. Sato, Y. Roppongi, and T. Takashima, Iwate Prefectural Ninohe Public Health Center, Iwate; Y. Miyajima, N. Suzuki, S. Nagasawa, Y. Furusugi, N. Nagai, Y. Ito, S. Komatsu, and T. Minamizono, Akita Prefectural Yokote Public Health Center, Akita; H. Sanada, Y. Hatayama, F. Kobayashi, H. Uchino, Y. Shirai, T. Kondo, R. Sasaki, Y. Watanabe, Y. Miyagawa, Y. Kobayashi, M. Machida, K. Kobayashi, and M. Tsukada, Nagano Prefectural Saku Public Health Center, Nagano; Y. Kishimoto, E. Takara, T. Fukuyama, M. Kinjo, M. Irei, and H. Sakiyama, Okinawa Prefectural Chubu Public Health Center, Okinawa; K. Imoto, H. Yazawa, T. Seo, A. Seiko, F. Ito, F. Shoji, and R. Saito, Katsushika Public Health Center, Tokyo; A. Murata, K. Minato, K. Motegi, T. Fujieda, and S. Yamato, Ibaraki Prefectural Mito Public Health Center, Ibaraki; T. Abe, M. Katagiri, M. Suzuki, and K. Matsui, Niigata Prefectural Kashiwazaki and Nagaoka Public Health Center, Niigata; M. Doi, A. Terao, Y. Ishikawa, and T. Tagami, Kochi Prefectural Chuo-higashi Public Health Center, Kochi; H. Sueta, H. Doi, M. Urata, N. Okamoto, and F. Ide and H. Goto, Nagasaki Prefectural Kamigoto Public Health Center, Nagasaki; H. Sakiyama, N. Onga, H. Takaesu, M. Uehara, T. Nakasone, and M. Yamakawa, Okinawa Prefectural Miyako Public Health Center, Okinawa; F. Horii, I. Asano, H. Yamaguchi, K. Aoki, S. Maruyama, M. Ichii, and M. Takano, Osaka Prefectural Suita Public Health Center, Osaka; Y. Tsubono, Tohoku University, Miyagi; K. Suzuki, Research Institute for Brain and Blood Vessels Akita, Akita; Y. Honda, K. Yamagishi, S. Sakurai, and N. Tsuchiya, University of Tsukuba, Ibaraki; M. Kabuto, National Institute for Environmental Studies, Ibaraki; M. Yamaguchi, Y. Matsumura, S. Sasaki, and S. Watanabe, National Institute of Health and Nutrition, Tokyo; M. Akabane, Tokyo University of Agriculture, Tokyo; T. Kadowaki and M. Inoue, The University of Tokyo, Tokyo; M. Noda and T. Mizoue, National Center for Global Health and Medicine, Tokyo; Y. Kawaguchi, Tokyo Medical and Dental University, Tokyo; Y. Takashima and Y. Yoshida, Kyorin University, Tokyo; K. Nakamura and R. Takachi, Niigata University, Niigata; J. Ishihara, Sagami Women’s University, Kanagawa; S. Matsushima and S. Natsukawa, Saku General Hospital, Nagano; H. Shimizu, Sakihae Institute, Gifu; H. Sugimura, Hamamatsu University School of Medicine, Shizuoka; S. Tominaga, Aichi Cancer Center, Aichi; N. Hamajima, Nagoya University, Aichi; H. Iso and T. Sobue, Osaka University, Osaka; M. Iida, W. Ajiki, and A. Ioka, Osaka Medical Center for Cancer and Cardiovascular Disease, Osaka; S. Sato, Chiba Prefectural Institute of Public Health, Chiba; E. Maruyama, Kobe University, Hyogo; M. Konishi, K. Okada, and I. Saito, Ehime University, Ehime; N. Yasuda, Kochi University, Kochi; S. Kono, Kyushu University, Fukuoka; S. Akiba, Kagoshima University, Kagoshima.
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Abe, S.K., Inoue, M., Sawada, N. et al. Glycemic index and glycemic load and risk of colorectal cancer: a population-based cohort study (JPHC Study). Cancer Causes Control 27, 583–593 (2016). https://doi.org/10.1007/s10552-016-0733-6
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DOI: https://doi.org/10.1007/s10552-016-0733-6