Cited by 514Cancer Risks and FactorsColorectal Cancer Screening and DetectionObesity, Physical Activity, Diet

Association of Obesity With Risk of Early-Onset Colorectal Cancer Among Women

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Liu, Po-Hong, Wu, Kana, Ng, Kimmie, Zauber, Ann G., Nguyen, Long H., Song, Mingyang, He, Xiaosheng, Fuchs, Charles S. +5 more·2019·JAMA Oncology

Abstract

Importance: Colorectal cancer (CRC) incidence and mortality among individuals younger than 50 years (early-onset CRC) are increasing. The reasons for such increases are largely unknown, although the increasing prevalence of obesity may be partially responsible. Objective: To investigate prospectively the association between obesity and weight gain since early adulthood with the risk of early-onset CRC. Design, Setting, and Participants: The Nurses' Health Study II is a prospective, ongoing cohort study of US female nurses aged 25 to 42 years at study enrollment (1989). A total of 85 256 women free of cancer and inflammatory bowel disease at enrollment were included in this analysis, with follow-up through December 31, 2011. Validated anthropomorphic measures and lifestyle information were self-reported biennially. Statistical analysis was performed from June 12, 2017, to June 28, 2018. Exposures: Current body mass index (BMI) (calculated as weight in kilograms divided by height in meters squared), BMI at 18 years of age, and weight gain since 18 years of age. Main Outcomes and Measures: Relative risk (RR) for incident early-onset CRC. Results: Among the 85 256 women studied, 114 cases of early-onset CRC were documented (median age at diagnosis, 45 years; interquartile range, 41-47 years) during 1 196 452 person-years of follow-up. Compared with women with a BMI of 18.5 to 22.9, the multivariable RR was 1.37 (95% CI, 0.81-2.30) for overweight women (BMI, 25.0-29.9) and 1.93 (95% CI, 1.15-3.25) for obese women (BMI, ≥30.0). The RR for each 5-unit increment in BMI was 1.20 (95% CI, 1.05-1.38; P = .01 for trend). Similar associations were observed among women without a family history of CRC and without lower endoscopy within the past 10 years. Both BMI at 18 years of age and weight gain since 18 years of age contributed to this observation. Compared with women with a BMI of 18.5 to 20.9 at 18 years of age, the RR of early-onset CRC was 1.32 (95% CI, 0.80-2.16) for women with a BMI of 21.0 to 22.9 and 1.63 (95% CI, 1.01-2.61) for women with a BMI of 23.0 or greater at 18 years of age (P = .66 for trend). Compared with women who had gained less than 5.0 kg or had lost weight, the RR of early-onset CRC was 1.65 (95% CI, 0.96-2.81) for women gaining 20.0 to 39.9 kg and 2.15 (95% CI, 1.01-4.55) for women gaining 40.0 kg or more (P = .007 for trend). Conclusions and Relevance: Obesity was associated with an increased risk of early-onset CRC among women. Further investigations among men and to elucidate the underlying biological mechanisms are warranted.

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Authors
Liu, P.-H., Wu, K., Ng, K., Zauber, A. G., Nguyen, L. H., Song, M., He, X., Fuchs, C. S., Ogino, S., Willett, W. C., Chan, A. T., Giovannucci, E. L., & Cao, Y.
Affiliations
  • Harvard University (US)
  • Memorial Sloan Kettering Cancer Center (US)
  • Yale Cancer Center (US)
  • Broad Institute (US)
  • Brigham and Women's Hospital (US)
Corresponding author
Cao, Yin
Venue
JAMA Oncology
Published
2019-01-01
Volume
5
Issue
1
Pages
37
ISSN
2374-2437 (ISSN-L)
OpenAlex
W2896926952
Cited by
514
References
91
Citations by year
2026: 45 · 2025: 65 · 2024: 77 · 2023: 79 · 2022: 90 · 2021: 70 · 2020: 56 · 2019: 30 · 2018: 1
FWCI
14.72
Type
journal article
Language
en
Open access
Locations
  • JAMA Oncology (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Crohn's and Colitis Foundation (563526)
  • National Cancer Institute (R01CA118553, R01CA137178, R35CA197735, UM1CA176726, K07CA218377, P30CA008748, R01CA205406)
  • National Institute of Diabetes and Digestive and Kidney Diseases (K24DK098311)
Topics
  • Health Sciences › Medicine › Oncology › Cancer Risks and Factors
  • Health Sciences › Medicine › Oncology › Colorectal Cancer Screening and Detection
  • Health Sciences › Medicine › Public Health, Environmental and Occupational Health › Obesity, Physical Activity, Diet
Keywords
early-onset colorectal cancer, obesity, body mass index, young women, colorectal cancer risk factors, Nurses' Health Study II, overweight, family history of colorectal cancer, colorectal cancer screening
MeSH terms
Adult, Female, Humans, Middle Aged, Nurses, Obesity, Prospective Studies, Risk Factors, Time Factors, United States, Colorectal Neoplasms, Weight Gain, Body Mass Index, Incidence, Age of Onset, Risk Assessment

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