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Systematic review
Soy intake and risk of endocrine-related gynaecological cancer: a meta-analysis
Article first published online: 23 SEP 2009
DOI: 10.1111/j.1471-0528.2009.02322.x
© 2009 The Authors Journal compilation © RCOG 2009 BJOG An International Journal of Obstetrics and Gynaecology
Issue
BJOG: An International Journal of Obstetrics & Gynaecology
Volume 116, Issue 13, pages 1697–1705, December 2009
Additional Information
How to Cite
Myung, S.-K., Ju, W., Choi, H., Kim, S. and The Korean Meta-Analysis (KORMA) Study Group (2009), Soy intake and risk of endocrine-related gynaecological cancer: a meta-analysis. BJOG: An International Journal of Obstetrics & Gynaecology, 116: 1697–1705. doi: 10.1111/j.1471-0528.2009.02322.x
Publication History
- Issue published online: 11 NOV 2009
- Article first published online: 23 SEP 2009
- Accepted 7 February 2009. Published Online 23 September 2009.
- Abstract
- Article
- References
- Cited By
Keywords:
- Gynaecological cancer;
- meta-analysis;
- soy
Background Epidemiology studies have reported associations between soy intake and the risk of endocrine-related gynaecological cancers. However, to date there have been no quantitative meta-analyses reported regarding this topic.
Objectives We investigated the quantitative associations between soy food intake and the risk of endometrial cancer and ovarian cancer by a meta-analysis of case–control studies and cohort studies.
Search strategy We searched MEDLINE (PubMed), EMBASE and the Cochrane Library during October 2008 using common keywords related to soy intake and endometrial or ovarian cancer. Two evaluators independently reviewed and selected articles, based on predetermined selection criteria.
Selection criteria Included studies met all of the following criteria: (1) a case–control study or cohort study (to date, no randomized controlled trials have been reported); (2) investigated the associations between ‘soy or soy product intake’ and ‘endometrial cancer’ or ‘ovarian cancer’; (3) reported outcome measures with adjusted odds ratios (OR) or relative risks (RR) and 95% confidence intervals (CI).
Data collection and analysis We investigated the associations between the overall soy intake (highest versus lowest intake) and the risk of endocrine-related gynaecological cancers (endometrial or ovarian cancer) as the main analysis. We also performed subgroup analyses by type of cancer (endometrial or ovarian), type of study design (case–control or cohort) and type of soy intake (soy foods or soy constituents).
Main results Out of 477 articles that met our initial criteria, a total of seven epidemiology studies consisting of five case–control studies and two cohort studies were included in the final analyses. Compared with the lowest soy intake, the OR for the highest soy intake was 0.61 (95% CI, 0.53–0.72) of all endocrine-related cancers among seven studies; 0.70 for endometrial cancer (95% CI, 0.57–0.86) and 0.52 for ovarian cancer (95% CI, 0.42–0.66) in the fixed-effects meta-analyses. The subgroup analyses by study design showed similar findings among the case–control studies (OR, 0.62; 95% CI, 0.53–0.73) and the cohort studies (OR, 0.57; 95% CI, 0.36–0.90).
Author’s conclusions The results of the current study showed protective effects of soy intake on the risk for endocrine-related gynaecological cancers. Additional larger prospective studies are now needed.