Bone management in Japanese patients with prostate cancer: hormonal therapy leads to an increase in the FRAX score.

Takashi Kawahara,Kayo Kurita,Kazuhiro Furuya,Yumiko Yokomizo,Yasuhide Myoshi,Masahiro Yao,Hiroji Uemura,Hiroki Ito,Hiroshi Miyamoto,Yusuke Ito,Koji Izumi,Narihiko Hayashi,Shusei Fusayasu,Hisashi Hasumi

doi:10.1186/s12894-016-0151-9

Abstract

BackgroundOsteoporosis is a common consequence of androgen deprivation therapy (ADT) for prostate cancer. Up to 20 % of men on ADT have suffered from fractures within 5 years. The WHO Fracture Risk Assessment Tool (FRAX) has been utilized to predict the 10-year probability of major osteoporotic and hip fracture. However, to date, no large studies assessing the utility of the FRAX score in prostate cancer patients with or without ADT have been performed. We herein evaluated the impact of ADT on the FRAX score in prostate cancer patients.MethodsThe assessment of the FRAX score was performed in a total of 1220 prostate cancer patients, including patients who underwent brachytherapy (n = 547), radical prostatectomy (n = 200), external beam radiation therapy (n = 264) and hormonal therapy alone (n = 187) at Yokohama City University Hospital (Yokohama, Japan). We evaluated the effect of ADT on the FRAX score.ResultsUsing the FRAX model, the median and mean 10-year probability of a major osteoporotic fracture according to the clinical risk factors alone was 7.9 % (8.8 ± 4.3 %), while the 10-year probability of hip fracture risk was 2.7 % (3.5 ± 3.1 %). In the ADT group, the duration of ADT was correlated with both major osteoporotic risk and hip fracture risk (R2 = 0.141, p < 0.001 and R2 = 0.166, p < 0.001, respectively). A comparison between the ADT (n = 187) and non-ADT (n = 399) groups demonstrated that the major fracture risk was > 20 % higher and the hip fracture risk was > 3 % higher in the ADT group than in the non-ADT group (ADT: 10 (5.3 %) and 118 (63.1 %), non-ADT 13 (3.3 %) and 189 (47.4 %), p < 0.001 and p < 0.001, respectively).ConclusionsThese results suggested that the longer duration of ADT led to an increased FRAX score, and the FRAX score may be a predictor of bone management treatment, particularly in prostate cancer patients.

Highlights

Osteoporosis is a common consequence of androgen deprivation therapy (ADT) for prostate cancer
The FRAX score is a fracture risk assessment tool developed by the World Health Organization (WHO) to predict the fracture risk of patients according to clinical risk factors alone or in combination with bone mineral density (BMD) at the femoral neck [11]
There were no differences in terms of age, body weight, body height, previous fractures, parent fractured hip, current smoking, use of glucocorticoids, rheumatoid arthritis, secondary osteoporosis, and alcohol consumption of 3 or more units per day, which are risk factors for fracture that are included in the FRAX score (Table 2)

Summary

Introduction

Osteoporosis is a common consequence of androgen deprivation therapy (ADT) for prostate cancer. The FRAX score is a fracture risk assessment tool developed by the World Health Organization (WHO) to predict the fracture risk of patients according to clinical risk factors alone or in combination with BMD at the femoral neck [11]. It is a computer-based algorithm which provides the 10-year probability of hip and major osteoporotic fractures (e.g., clinical spine, forearm, hip, or shoulder fracture) according to age, sex, body mass index, and clinical risk factors [12, 13]. There have been no proven methods for predicting pathologic fractures in patients with skeletal metastasis far [14]

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