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Serum Calcium and the Risk of Breast Cancer: Findings from the Swedish AMORIS Study and a Meta-Analysis of Prospective Studies
Kings Coll London, Div Canc Studies, Canc Epidemiol Grp, London SE1 9RT, England..
Kings Coll London, Div Canc Studies, Canc Epidemiol Grp, London SE1 9RT, England..
Kings Coll London, Div Canc Studies, Canc Epidemiol Grp, London SE1 9RT, England..
Kings Coll London, Div Canc Studies, Canc Epidemiol Grp, London SE1 9RT, England..
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2016 (English)In: International Journal of Molecular Sciences, ISSN 1422-0067, E-ISSN 1422-0067, Vol. 17, no 9, 1487Article in journal (Refereed) Published
Abstract [en]

To investigate the association between serum calcium and risk of breast cancer using a large cohort and a systematic review with meta-analysis. From the Swedish Apolipoprotein Mortality Risk (AMORIS) Study we included 229,674 women who had baseline measurements of serum total calcium and albumin. Multivariable Cox regression was used to assess the association between total and albumin-corrected calcium and breast cancer risk. For the systematic review, an electronic search of MEDLINE and EMBASE databases was performed to identify other prospective cohorts assessing the relationship between serum calcium and breast cancer risk. We pooled the results of our AMORIS cohort with other eligible studies in a meta-analysis using a random effects model. I-2 test was used to assess heterogeneity. In the AMORIS study, 10,863 women were diagnosed with breast cancer (mean follow-up: 19 years). We found an inverse association between total serum calcium and breast cancer when comparing the fourth quartile to the first quartile (HR: 0.94, 95% CI: 0.88-0.99, p value for trend 0.04) and similar results using albumin-corrected calcium. In the systematic review, we identified another two prospective cohorts evaluating pre-diagnostic serum total calcium and breast cancer. Combining these studies and our findings in AMORIS in a meta-analysis showed a protective effect of serum calcium against breast cancer, with a summary RR of 0.80 (95% CI: 0.66-0.97). No substantial heterogeneity was observed. Our findings in AMORIS and the meta-analysis support an inverse association between serum calcium and breast cancer risk, which warrants mechanistic investigations.

Place, publisher, year, edition, pages
2016. Vol. 17, no 9, 1487
Keyword [en]
calcium, breast cancer, albumin, prospective study
National Category
Cancer and Oncology
Identifiers
URN: urn:nbn:se:uu:diva-307760DOI: 10.3390/ijms17091487ISI: 000385525500113OAI: oai:DiVA.org:uu-307760DiVA: diva2:1048304
Funder
Swedish Cancer Society
Available from: 2016-11-21 Created: 2016-11-21 Last updated: 2016-11-21Bibliographically approved

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Holmberg, Lars
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