Abstract
Purpose
Circulating adipose stromal cells (CASC) are thought to be increased in obesity and facilitate angiogenesis, and tumor metastases.
Methods
CASC were identified from buffy coat peripheral blood mononuclear cells (PBMCs) by flow cytometry as CD34brightCD31− CD45− and CASC frequency was compared to adiposity measures in 33 women at increased risk for breast cancer. Feasibility of CASC as a response biomarker for a diet and exercise intervention in ten breast cancer survivors was then explored.
Results
For 33 high-risk women, median CASC frequency was 9.7 per million PBMCs and trended positively with body mass index, fat mass index (FMI), and percent android fat. Correlation was significant when BMI was dichotomized at > versus < 35 kg/m2 (p = 0.02). For ten breast cancer survivors with a median BMI of 37 kg/m2, median CASC frequency was 16.4 per million PBMCs. In univariate analyses, change in BMI, total fat and visceral fat were significantly correlated with change in CASC frequency. On multivariate analysis, change in visceral adipose had the strongest association with change in CASC frequency (p < 0.00078).
Conclusions
The association between the reduction in visceral adipose tissue and the decrease in frequency of circulating adipose stromal cells suggests that the latter might be a useful biomarker in clinical trials of obese breast cancer survivors undergoing a weight loss intervention.
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Acknowledgements
This work was supported in part by grants from the Breast Cancer Research Foundation. We acknowledge the Flow Cytometry Core Laboratory, which is sponsored, in part, by the NIH/NIGMS COBRE Grant P30 GM103326.
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Baker, H.A., Fabian, C.J., Hastings, R.C. et al. Circulating adipose stromal cells as a response biomarker in phase II energy balance trials of obese breast cancer survivors and high-risk women. Breast Cancer Res Treat 176, 387–394 (2019). https://doi.org/10.1007/s10549-019-05251-7
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DOI: https://doi.org/10.1007/s10549-019-05251-7