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Abdominal and pelvic adipose tissue distribution and risk of prostate cancer recurrence after radiation therapy
Author(s) -
Di Bella Claire M.,
Howard Lauren E.,
Oyekunle Taofik,
De Hoedt Amanda M.,
Salama Joseph K.,
Song Haijun,
Freedland Stephen J.,
Allott Emma H.
Publication year - 2020
Publication title -
the prostate
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.295
H-Index - 123
eISSN - 1097-0045
pISSN - 0270-4137
DOI - 10.1002/pros.24054
Subject(s) - medicine , prostate cancer , androgen deprivation therapy , body mass index , hazard ratio , obesity , adipose tissue , confidence interval , radiation therapy , proportional hazards model , cancer , oncology
Background Fat distribution varies between individuals of similar body mass index (BMI). We hypothesized that visceral obesity is more strongly associated with poor prostate cancer outcomes than overall obesity defined by BMI. Materials and Methods We quantified abdominal visceral and subcutaneous fat area (VFA and SFA), and pelvic periprostatic adipose tissue area (PPAT), using computed tomography scans from radiation‐treated prostate cancer patients at the Durham North Carolina Veterans Administration Hospital. Multivariable‐adjusted Cox regression examined associations between each adiposity measure and risk of recurrence, overall and stratified by race and receipt of androgen deprivation therapy (ADT). Results Of 401 patients (59% black) treated from 2005 to 2011, 84 (21%) experienced recurrence during 9.3 years median follow‐up. Overall, obesity defined by BMI was not associated with recurrence risk overall or stratified by race or ADT, nor was any measure of fat distribution related to the risk of recurrence overall or by race. However, higher VFA was associated with increased risk of recurrence in men who received radiation only (hazard ratio [HR], 1.79; 95% confidence interval [CI], 0.87‐3.66), but inversely associated with recurrence risk in men treated with radiation and ADT (HR, 0.49; 95% CI, 0.24‐1.03; P ‐interaction = .002), though neither association reached statistical significance. Similar patterns of ADT‐stratified associations were observed for PPAT and SFA. Conclusions Associations between abdominal and pelvic adiposity measures and recurrence risk differed significantly by ADT receipt, with positive directions of association observed only in men not receiving ADT. If confirmed, our findings suggest that obesity may have varying effects on prostate cancer progression risk dependent on the hormonal state of the individual.