Effect of Chemotherapy on Dual-Energy X-ray Absorptiometry (DXA) Body Composition Precision Error in Head and Neck Cancer Patients |
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| Affiliation: | 1. Department of Medical Imaging and Intervention, Chang Gung Memorial Hospital, Keelung and Chang Gung University, Taiwan;2. Department of Medical Imaging and Intervention, Chang Gung Memorial Hospital, Linkou and Chang Gung University, Taiwan;3. Division of Hemato-oncology, Department of Internal Medicine, Chang Gung Memorial Hospital, Keelung and Chang Gung University, College of Medicine, Keelung, Taiwan;4. Department of Obstetrics and Gynecology, Chang Gung Memorial Hospital, Chang Gung University, Keelung, Taiwan;5. Department of Radiology, Beth Israel Deaconess Medical Center, Harvard Medical School, USA;6. Keelung Osteoporosis Prevention and Treatment Center, Keelung, Taiwan;1. Department of Rheumatology and Immunology, The First Affiliated Hospital of Anhui Medical University, Hefei, China;2. Department of Scientific Research, The First Affiliated Hospital of Anhui Medical University, Hefei, China;2. Department of Radiology, The First Affiliated Hospital of Nanchang University, Nanchang, China;1. Surgery Department, District Hospital in Strzelce Opolskie, Strzelce Opolskie, Poland;1. McCaig Institute for Bone and Joint Health, University of Calgary, Calgary AB, Canada;2. Department of Radiology, Cumming School of Medicine, University of Calgary, Calgary AB, Canada;3. Department of Surgery, Cumming School of Medicine, University of Calgary, Calgary AB, Canada;1. Department of Clinical Biochemistry, North Zealand Hospital, University of Copenhagen, Denmark;2. Norwegian Quality Improvement of Primary Care Laboratories (NOKLUS), Section for General Practice, University of Bergen, Bergen, Norway |
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| Abstract: | Background: Precision error in dual-energy X-ray absorptiometry (DXA) is defined as difference in results due to instrumental and technical factors given no biologic change. The aim of this study is to compare precision error in DXA body composition scans in head and neck cancer patients before and 2 months after chemotherapy. Methodology: A total of 34 male head and neck cancer patients with normal body mass index (BMI) were prospectively enrolled and all patients received 2 consecutive DXA scans both before and after 2 months of chemotherapy for a total of 4 scans. The precision error of 3 DXA body composition values (lean mass, fat mass, and bone mineral content) was calculated for total body and 5 body regions (arms, legs, trunk, android, and gynoid). Precision errors before and after treatment were compared using generalized estimating equation model. Results: There was no significant change in precision error for the DXA total body composition values following chemotherapy; lean mass (0.33%–0.40%, p = 0.179), total fat mass (1.39%–1.70%, p = 0.259) and total bone mineral content (0.42%–0.56%, p = 0.243). However, there were significant changes in regional precision error; trunk lean mass (1.19%–1.77%, p = 0.014) and android fat mass (2.17%–3.72%, p = 0.046). Conclusions: For head and neck cancer patients, precision error of DXA total body composition values did not change significantly following chemotherapy; however, there were significant changes in fat mass in the android and lean mass in the trunk. Caution should be exercised when interpreting longitudinal DXA body composition data in those body parts. |
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