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Published in: BMC Cancer 1/2018

Open Access 01-12-2018 | Research article

Impact of a behaviorally-based weight loss intervention on parameters of insulin resistance in breast cancer survivors

Authors: Kim L. Dittus, Jean R. Harvey, Janice Y. Bunn, Nathan D. Kokinda, Karen M. Wilson, Jeff Priest, Richard E. Pratley

Published in: BMC Cancer | Issue 1/2018

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Abstract

Background

Breast cancer survivors with excess weight are more likely to have negative breast cancer outcomes. Biomarkers related to insulin resistance may help explain this negative association. Weight loss is associated with improvements in insulin sensitivity. Our goal was to identify the impact of a behaviorally based weight loss intervention on indices of insulin resistance.

Methods

Overweight, early stage breast cancer survivors who completed initial cancer therapy were enrolled in a 6 month behaviorally based weight loss intervention that included calorie reduction, exercise and behavior modification. Biomarkers related to insulin resistance were obtained at baseline and after the intervention. Results from participants who achieved ≥5% weight loss were compared to those who lost less weight.

Results

Despite not having diabetes as a preexisting diagnosis prior to the study, 69% of all participants were considered to have pre-diabetes or diabetes at baseline based on American Diabetes Association definitions. Participants who achieved ≥5% weight loss had significantly lower fasting insulin, AUC insulin, and insulin resistance as measured by HOMA-IR. Beta cell function decreased as anticipated when insulin resistance improved. Additionally, leptin levels declined.

Conclusions

Breast cancer survivors who achieved ≥5% weight loss demonstrated significant improvements in indices of insulin resistance. Despite an exclusion criteria of diabetes at the time of enrolment, a high proportion met criteria for pre-diabetes or diabetes at baseline. Pre-diabetes appears to be under recognized in overweight breast cancer survivors. Behaviorally based weight loss interventions can result in weight loss and improvements in biomarkers related to breast cancer outcomes and additionally may decrease the chance of developing diabetes.

Trial registration

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Metadata
Title
Impact of a behaviorally-based weight loss intervention on parameters of insulin resistance in breast cancer survivors
Authors
Kim L. Dittus
Jean R. Harvey
Janice Y. Bunn
Nathan D. Kokinda
Karen M. Wilson
Jeff Priest
Richard E. Pratley
Publication date
01-12-2018
Publisher
BioMed Central
Published in
BMC Cancer / Issue 1/2018
Electronic ISSN: 1471-2407
DOI
https://doi.org/10.1186/s12885-018-4272-2

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