Journal article
Diabetes, metformin use, and colorectal cancer survival in postmenopausal women
Cancer epidemiology, Vol.37(5), pp.742-749
10/2013
DOI: 10.1016/j.canep.2013.04.015
PMCID: PMC3769471
PMID: 23773299
Abstract
Background: Observational studies have associated metformin use with lower colorectal cancer (CRC) incidence but few studies have examined metformin's influence on CRC survival. We examined the relationships among metformin use, diabetes, and survival in postmenopausal women with CRC in the Women's Health Initiative (WHI) clinical trials and observational study. Methods: 2066 postmenopausal women with CRC were followed for a median of 4.1 years, with 589 deaths after CRC diagnosis from all causes and 414 deaths directly attributed to CRC. CRC-specific survival was compared among women with diabetes with metformin use (n=84); women with diabetes with no metformin use (n=128); and women without diabetes (n=1854). Cox proportional hazard models were used to estimate associations among metformin use, diabetes and survival after CRC. Strategies to adjust for potential confounders included: multivariate adjustment with known predictors of colorectal cancer survival and construction of a propensity score for the likelihood of receiving metformin, with model stratification by propensity score quintile. Results: After adjusting for age and stage, CRC specific survival in women with diabetes with metformin use was not significantly different compared to that in women with diabetes with no metformin use (HR 0.75; 95% CI 0.40–1.38, p=0.67) and to women without diabetes (HR 1.00; 95% CI 0.61–1.66, p=0.99). Following propensity score adjustment, the HR for CRC-specific survival in women with diabetes with metformin use compared to non-users was 0.78 (95% CI 0.38–1.55, p=0.47) and for overall survival was 0.86 (95% CI 0.49–1.52; p=0.60). Conclusions: In postmenopausal women with CRC and DM, no statistically significant difference was seen in CRC specific survival in those who used metformin compared to non-users. Analyses in larger populations of colorectal cancer patients are warranted.
Details
- Title: Subtitle
- Diabetes, metformin use, and colorectal cancer survival in postmenopausal women
- Creators
- Furha Iram Cossor - Tufts Medical CenterLucile L. Adams-Campbell - Georgetown UniversityRowan T. Chlebowski - The Lundquist InstituteMarc J. Gunter - Imperial College LondonKaren Johnson - University of Tennessee Health Science CenterRobert E. Martell - Tufts UniversityAnne McTiernan - Fred Hutch Cancer CenterMichael S. Simon - The Barbara Ann Karmanos Cancer InstituteThomas Rohan - Albert Einstein College of MedicineRobert B. Wallace - University of IowaJessica K. Paulus - Tufts University
- Resource Type
- Journal article
- Publication Details
- Cancer epidemiology, Vol.37(5), pp.742-749
- DOI
- 10.1016/j.canep.2013.04.015
- PMID
- 23773299
- PMCID
- PMC3769471
- NLM abbreviation
- Cancer Epidemiol
- ISSN
- 1877-7821
- eISSN
- 1877-783X
- Publisher
- Elsevier Ltd
- Language
- English
- Date published
- 10/2013
- Academic Unit
- Epidemiology; Injury Prevention Research Center; Internal Medicine
- Record Identifier
- 9984363574202771
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