Abstract
Background
Anthropometric and hormone-related factors are established endometrial cancer risk factors; however, little is known about the impact of these factors on endometrial cancer risk in non-White women.
Methods
Among 110,712 women participating in the Multiethnic Cohort (MEC) Study, 1150 incident invasive endometrial cancers were diagnosed. Hazard ratios (HRs) and 95% confidence intervals (CIs) for associations with endometrial cancer risk for race/ethnicity and for risk factors across racial/ethnic groups were calculated.
Results
Having a higher body mass index (BMI) at baseline or age 21 years was strongly associated with increased risk (pint race/ethnicity ≥ 0.36). Parity (vs nulliparity) was inversely associated with risk in all the groups except African Americans (pint 0.006). Current use of postmenopausal hormones at baseline (PMH-E; vs never use) was associated with increased risk in Whites and Japanese Americans (pint 0.002). Relative to Whites, endometrial cancer risk was lower in Japanese Americans and Latinas and non-significantly higher in Native Hawaiians. Risk in African Americans did not differ from that in Whites.
Conclusions
Racial/ethnic differences in endometrial cancer risk were not fully explained by anthropometric or hormone-related risk factors. Further studies are needed to identify reasons for the observed racial/ethnic differences in endometrial cancer risk.
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Conception of the study (D.S., L.R.W., L.L.M., M.A.M.), design of the study (all authors), data acquisition and/or analysis (D.S., L.R.W., K.K.W., L.L.M., S.-Y.P., J.L.K., M.A.M.), interpretation of data (D.S., L.R.W., M.A.M.), creation of new software used in the work (not applicable), drafting and/or substantially revising the work (all authors).
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Our study was approved by the Institutional Review Board at the University of Hawaii. The Multiethnic Cohort Study was approved by the Institutional Review Boards at the University of Hawaii and the University of Southern California, who considered return of the completed baseline questionnaire as active consent. This study was performed in accordance with the Declaration of Helsinki.
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For information on applications to gain access to data from the Multiethnic Cohort Study, please see: https://www.uhcancercenter.org/for-researchers/mec-data-sharing.
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The authors declare no competing interests.
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The Multiethnic Cohort Study is supported by National Cancer Institute grants R37CA54281 (L.N. Kolonel) and U01CA164973 (L.L.M., C. Haiman, L.R.W.).
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Sarink, D., Wilkens, L.R., White, K.K. et al. Racial/ethnic differences in anthropometric and hormone-related factors and endometrial cancer risk: the Multiethnic Cohort Study. Br J Cancer 124, 1724–1733 (2021). https://doi.org/10.1038/s41416-021-01292-2
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DOI: https://doi.org/10.1038/s41416-021-01292-2