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Vitamin C intake and breast cancer mortality in a cohort of Swedish women
BACKGROUND: Vitamin C may influence cancer progression through its antioxidant properties. However, the evidence from observational epidemiologic studies on vitamin C intake and survival following breast cancer diagnosis is not consistent, and the safety of vitamin C supplements following breast can...
Autores principales: | , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group
2013
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3708583/ https://www.ncbi.nlm.nih.gov/pubmed/23736027 http://dx.doi.org/10.1038/bjc.2013.269 |
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author | Harris, H R Bergkvist, L Wolk, A |
author_facet | Harris, H R Bergkvist, L Wolk, A |
author_sort | Harris, H R |
collection | PubMed |
description | BACKGROUND: Vitamin C may influence cancer progression through its antioxidant properties. However, the evidence from observational epidemiologic studies on vitamin C intake and survival following breast cancer diagnosis is not consistent, and the safety of vitamin C supplements following breast cancer diagnosis has not been extensively studied. METHODS: Using a food-frequency questionnaire we investigated whether vitamin C intake was associated with survival among 3405 women diagnosed with invasive breast cancer in the Swedish Mammography Cohort. RESULTS: From 1987–2010, there were 1055 total deaths with 416 deaths from breast cancer. Women in the highest quartile of pre-diagnosis vitamin C intake had an adjusted HR (95% CI) of breast cancer death of 0.75 (0.57–0.99) compared with those in the lowest quartile (P(trend)=0.03). There was a borderline significant association between vitamin C intake and total mortality (HR=0.84; 95% CI=0.71–1.00; P(trend)=0.08). Among 717 breast cancer cases for whom post-diagnosis supplement use was available, there was no association between vitamin C supplement use (≈1000 mg) and breast cancer-specific mortality (HR=1.06; 95% CI=0.52–2.17). CONCLUSION: Our findings suggest that dietary vitamin C intake before breast cancer diagnosis may be associated with breast cancer survival. In addition, post-diagnosis vitamin C supplementation at the level observed in our population was not associated with survival. |
format | Online Article Text |
id | pubmed-3708583 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2013 |
publisher | Nature Publishing Group |
record_format | MEDLINE/PubMed |
spelling | pubmed-37085832014-07-09 Vitamin C intake and breast cancer mortality in a cohort of Swedish women Harris, H R Bergkvist, L Wolk, A Br J Cancer Epidemiology BACKGROUND: Vitamin C may influence cancer progression through its antioxidant properties. However, the evidence from observational epidemiologic studies on vitamin C intake and survival following breast cancer diagnosis is not consistent, and the safety of vitamin C supplements following breast cancer diagnosis has not been extensively studied. METHODS: Using a food-frequency questionnaire we investigated whether vitamin C intake was associated with survival among 3405 women diagnosed with invasive breast cancer in the Swedish Mammography Cohort. RESULTS: From 1987–2010, there were 1055 total deaths with 416 deaths from breast cancer. Women in the highest quartile of pre-diagnosis vitamin C intake had an adjusted HR (95% CI) of breast cancer death of 0.75 (0.57–0.99) compared with those in the lowest quartile (P(trend)=0.03). There was a borderline significant association between vitamin C intake and total mortality (HR=0.84; 95% CI=0.71–1.00; P(trend)=0.08). Among 717 breast cancer cases for whom post-diagnosis supplement use was available, there was no association between vitamin C supplement use (≈1000 mg) and breast cancer-specific mortality (HR=1.06; 95% CI=0.52–2.17). CONCLUSION: Our findings suggest that dietary vitamin C intake before breast cancer diagnosis may be associated with breast cancer survival. In addition, post-diagnosis vitamin C supplementation at the level observed in our population was not associated with survival. Nature Publishing Group 2013-07-09 2013-06-04 /pmc/articles/PMC3708583/ /pubmed/23736027 http://dx.doi.org/10.1038/bjc.2013.269 Text en Copyright © 2013 Cancer Research UK http://creativecommons.org/licenses/by-nc-sa/3.0/ From twelve months after its original publication, this work is licensed under the Creative Commons Attribution-NonCommercial-Share Alike 3.0 Unported License. To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-sa/3.0/ |
spellingShingle | Epidemiology Harris, H R Bergkvist, L Wolk, A Vitamin C intake and breast cancer mortality in a cohort of Swedish women |
title | Vitamin C intake and breast cancer mortality in a cohort of Swedish women |
title_full | Vitamin C intake and breast cancer mortality in a cohort of Swedish women |
title_fullStr | Vitamin C intake and breast cancer mortality in a cohort of Swedish women |
title_full_unstemmed | Vitamin C intake and breast cancer mortality in a cohort of Swedish women |
title_short | Vitamin C intake and breast cancer mortality in a cohort of Swedish women |
title_sort | vitamin c intake and breast cancer mortality in a cohort of swedish women |
topic | Epidemiology |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3708583/ https://www.ncbi.nlm.nih.gov/pubmed/23736027 http://dx.doi.org/10.1038/bjc.2013.269 |
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