Abstract
Objective
To determine the role of brown adipose tissue (BAT) in cancer activity.
Materials and methods
The study group comprised 142 patients (121 female, 21 male; mean age, 49 ± 16 years) who underwent F18-FDG PET/CT (PET/CT) for staging or surveillance of cancer and who were BAT-positive on PET/CT. BAT volume by PET/CT, abdominal (visceral and subcutaneous) fat and paraspinous muscle cross-sectional areas (CSA) were assessed. Groups with and without active cancer on PET/CT were compared using a two-sided paired t test. Linear regression analyses between BAT and body composition parameters were performed.
Results
There were 62 patients (54 female, eight male) who had active cancer on PET/CT and 80 patients (67 female, 13 male) without active cancer. Groups were similar in age and BMI (p ≥ 0.4), abdominal fat and muscle CSA, fasting glucose, and outside temperature at time of scan (p ≥ 0.2). Patients who had active cancer on PET/CT had higher BAT volume compared to patients without active cancer (p = 0.009). In patients without active cancer, BAT was positively associated with BMI and abdominal fat depots (r = 0.46 to r = 0.59, p < 0.0001) while there were no such associations in patients with active cancer (p ≥ 0.1). No associations between BAT and age or muscle CSA were found (p ≥ 0.1).
Conclusions
BAT activity is greater in patients with active cancer compared to age-, sex-, and BMI-matched BAT-positive patients without active cancer, suggesting a possible role of BAT in cancer activity.


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Funding
This study was supported by NIH grants K24 DK-109940 and P30DK040561.
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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.
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Supplementary Figure 1
Quantification of brown adipose tissue in regions of interest (green outline) in images obtained with positron-emission tomography (PET) (A) and CT (B). (PNG 524 kb)
Supplementary Figure 2
Quantification of abdominal total adipose tissue (A), visceral adipose tissue (B), subcutaneous adipose tissue (C), and paraspinal muscle (D) on axial non-contrast CT using semiautomated methods. (PNG 620 kb)
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Bos, S.A., Gill, C.M., Martinez-Salazar, E.L. et al. Preliminary investigation of brown adipose tissue assessed by PET/CT and cancer activity. Skeletal Radiol 48, 413–419 (2019). https://doi.org/10.1007/s00256-018-3046-x
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DOI: https://doi.org/10.1007/s00256-018-3046-x