Randomized controlled trial of weight loss versus usual care on telomere length in women with breast cancer: the lifestyle, exercise, and nutrition (LEAN) study
Some studies suggest that telomere shortening may be associated with increased breast cancer risk and mortality. Obesity is also associated with increased breast cancer risk and mortality. Few studies have examined changes in telomere length in overweight or obese breast cancer survivors. The purpose of our study was to examine the effect of a 6-month diet- and exercise-induced weight loss intervention versus usual care on telomere length in breast cancer survivors.
151 breast cancer survivors with body mass index (BMI) ≥ 25 kg/m2 were randomly assigned to a 6-month weight loss intervention (n = 93) or to usual care (n = 58). Fasting blood samples, height, weight, physical activity, and diet were measured at baseline and 6-months. Relative telomere length (RTL) was measured by quantitative-polymerase chain reaction (qPCR) done on buffy coat-extracted genomic DNA. Mean baseline to 6-month changes were compared between groups (intention-to-treat) using generalized estimating equations.
Complete telomere data were available in 125 participants. Women were 58 ± 8 years, with BMI 33.0 ± 6.2 kg/m2 and were 2.9 ± 2.5 years from diagnosis; 90% were non-Hispanic white, and 76% had stage 0/I breast cancer. After 6 months, women randomized to weight loss had 3% telomere lengthening compared to 5% shortening in the usual care group (p = 0.12). Among women with stage 0/I, the intervention group experienced 7% telomere lengthening compared to 8% shortening in the usual care group (p = 0.01). No intervention effect was observed in women with stage II/III breast cancer.
Our findings suggest a weight loss intervention in stage 0 and 1 breast cancer survivors may lead to telomere lengthening, compared to a shortening in their usual care counterparts.
KeywordsBreast cancer Exercise Weight loss Telomere
Supported by American Institute for Cancer Research and in part by a grant from the Breast Cancer Research Foundation. Also supported in part by the Yale Cancer Center Support Grant P30 CA016359 and the Clinical and Translational Science Award Grant Number UL1 TR000142 from the National Center for Advancing Translational Science, a component of the National Institutes of Health.
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interest.
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