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01-10-2014 | Original paper

Postdiagnosis body mass index and risk of mortality in colorectal cancer survivors: a prospective study and meta-analysis

Authors: Sabrina Schlesinger, Sabine Siegert, Manja Koch, Jessica Walter, Nils Heits, Sebastian Hinz, Gunnar Jacobs, Jochen Hampe, Clemens Schafmayer, Ute Nöthlings

Published in: Cancer Causes & Control | Issue 10/2014

Abstract

Purpose

Aim of this study was to investigate the association between postdiagnosis body mass index (BMI) and all-cause mortality in colorectal cancer (CRC) survivors in a prospective study and meta-analysis.

Methods

We conducted a prospective cohort study on 2,143 CRC survivors in Germany. Participants were recruited to the study on average 4 years after diagnosis, and postdiagnosis BMI was assessed at recruitment using a self-administered questionnaire. CRC survivors were followed up for a mean time of 3.5 years. The association between BMI and all-cause mortality was investigated using multivariable Cox proportional hazards models. Additionally, we performed a meta-analysis of studies on postdiagnosis BMI and all-cause mortality (n = 5, including this study) by applying random-effects models.

Results

In the prospective analysis, 349 participants died. BMI was not statistically significantly associated with all-cause mortality. Compared to normal weight survivors, the hazard ratios (HRs) [95 % confidence interval (CI)] for all-cause mortality in underweight, overweight and obese survivors were 1.65 (0.79–3.45), 0.80 (0.62–1.03) and 0.84 (0.62–1.14), respectively. In the meta-analysis, individuals with underweight were at increased risk for all-cause mortality [HR (95 % CI) 1.72 (1.18–2.49)], whereas individuals with overweight had a lower risk [HR (95 % CI) 0.79 (0.71–0.88)], compared to normal weight subjects. For obesity, the risk of mortality was also reduced with only borderline significance [HR (95 % CI) 0.88 (0.77–1.00)].

Conclusions

While the present study as well as single previously published studies showed that overweight was associated with a non-significant reduced risk for all-cause mortality, our meta-analysis indicated a decreased mortality risk among overweight CRC survivors.

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Title: Postdiagnosis body mass index and risk of mortality in colorectal cancer survivors: a prospective study and meta-analysis
Authors: Sabrina Schlesinger
Sabine Siegert
Manja Koch
Jessica Walter
Nils Heits
Sebastian Hinz
Gunnar Jacobs
Jochen Hampe
Clemens Schafmayer
Ute Nöthlings
Publication date: 01-10-2014
Publisher: Springer International Publishing
Published in: Cancer Causes & Control / Issue 10/2014
Print ISSN: 0957-5243
Electronic ISSN: 1573-7225
DOI: https://doi.org/10.1007/s10552-014-0435-x

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Abstract

Purpose

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