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Vitamin C and survival among women with breast cancer: A Meta-analysis

  • Holly R. Harris
    Correspondence
    Corresponding author at: Division of Nutritional Epidemiology, Institute for Environmental Medicine, Karolinska Institutet, P.O. Box 210, SE-171 77 Stockholm, Sweden. Tel.: +46 8 524 86460; fax: +46 8 304571.
    Affiliations
    Unit of Nutritional Epidemiology, Institute for Environmental Medicine, Karolinska Institutet, Box 210, 171 77 Stockholm, Sweden

    Obstetrics and Gynecology Epidemiology Center, Brigham and Women’s Hospital, 221 Longwood Avenue, Boston, MA 02115, USA
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  • Nicola Orsini
    Affiliations
    Unit of Nutritional Epidemiology, Institute for Environmental Medicine, Karolinska Institutet, Box 210, 171 77 Stockholm, Sweden
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  • Alicja Wolk
    Affiliations
    Unit of Nutritional Epidemiology, Institute for Environmental Medicine, Karolinska Institutet, Box 210, 171 77 Stockholm, Sweden
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Published:March 12, 2014DOI:https://doi.org/10.1016/j.ejca.2014.02.013

      Abstract

      Background

      The association between dietary vitamin C intake and breast cancer survival is inconsistent and few studies have specifically examined vitamin C supplement use among women with breast cancer. The purpose of this study was to summarise results from prospective studies on the association between vitamin C supplement use and dietary vitamin C intake and breast cancer-specific mortality and total mortality.

      Methods

      Studies were identified using the PubMed database through February 6, 2014 and by examining the references of retrieved articles. Prospective studies were included if they reported relative risks (RR) with 95% confidence intervals (95% CIs) for at least two categories or as a continuous exposure. Random-effects models were used to combine study-specific results.

      Results

      The ten identified studies examined vitamin C supplement use (n = 6) and dietary vitamin C intake (n = 7) and included 17,696 breast cancer cases, 2791 total deaths, and 1558 breast cancer-specific deaths. The summary RR (95% CI) for post-diagnosis vitamin C supplement use was 0.81 (95% CI 0.72–0.91) for total mortality and 0.85 (95% CI 0.74–0.99) for breast cancer-specific mortality. The summary RR for a 100 mg per day increase in dietary vitamin C intake was 0.73 (95% CI 0.59–0.89) for total mortality and 0.78 (95% CI 0.64–0.94) for breast cancer-specific mortality.

      Conclusion

      Results from this meta-analysis suggest that post-diagnosis vitamin C supplement use may be associated with a reduced risk of mortality. Dietary vitamin C intake was also statistically significantly associated with a reduced risk of total mortality and breast cancer-specific mortality.

      Keywords

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