Jason Chia-Hsien Cheng1, Jose G Bazan2, Jian-Kuen Wu3, Albert C Koong2, Daniel T Chang4. 1. Department of Radiation Oncology, Stanford University, Stanford, California; Division of Radiation Oncology, Department of Oncology, National Taiwan University Hospital, Taipei, Taiwan. 2. Department of Radiation Oncology, Stanford University, Stanford, California. 3. Division of Radiation Oncology, Department of Oncology, National Taiwan University Hospital, Taipei, Taiwan; Institute of Electro-Optical Science and Technology, National Taiwan Normal University, Taipei, Taiwan. 4. Department of Radiation Oncology, Stanford University, Stanford, California. Electronic address: dtchang@stanford.edu.
Abstract
PURPOSE: To identify various dosimetric parameters of bone marrow cavity that correlate with acute hematologic toxicity (HT) in patients with anal squamous cell carcinoma treated with definitive chemoradiation therapy (CRT). METHODS AND MATERIALS: We analyzed 32 patients receiving CRT. The whole pelvic bone marrow (PBM) and the lumbosacral spine (LSS) subregion were contoured for each patient. Marrow cavities were contoured using the Hounsfield units (HUs) of 100, 150, 200, and 250 as maximum density threshold levels. The volume of each region receiving at least 5, 10, 15, 20, 30, and 40 Gy was calculated. The endpoint was grade ≥3 HT (HT3+). Normal-tissue complication probability (NTCP) was evaluated with the Lyman-Kutcher-Burman (LKB) model. Maximal likelihood estimate was used to compare the parameter set. Logistic regression was used to test associations between HT and both dosimetric and clinical parameters. RESULTS: Ten patients (31%) experienced HT3+. While dose to both LSS and PBM significantly predicted for HT3+, LSS was superior to PBM by logistic regression and LKB modeling. Constrained optimization of the LKB model for HT3+ yielded the parameters m = 0.21, n = 1, and TD50 = 32 Gy for LSS. The NTCP fits were better with the whole bone than with marrow cavity using any HU threshold. Mean LSS doses of 21 Gy and 23.5 Gy result in a 5% and 10% risk of HT3+, respectively. Mean dose and low-dose radiation parameters (V5, V10, V15, V20) of whole bone or bone cavities of LSS were correlated most significantly with HT3+. CONCLUSIONS: For predicting the risk of HT3+, whole-bone contours were superior to marrow cavity and LSS was superior to PBM by LKB modeling. The results confirm PBM and LSS as parallel organs when predicting hematologic toxicity. Recommended dose constraints to the LSS are V10 ≤80%. An LSS mean dose of 23.5 Gy is associated with a 10% risk of HT.
PURPOSE: To identify various dosimetric parameters of bone marrow cavity that correlate with acute hematologic toxicity (HT) in patients with anal squamous cell carcinoma treated with definitive chemoradiation therapy (CRT). METHODS AND MATERIALS: We analyzed 32 patients receiving CRT. The whole pelvic bone marrow (PBM) and the lumbosacral spine (LSS) subregion were contoured for each patient. Marrow cavities were contoured using the Hounsfield units (HUs) of 100, 150, 200, and 250 as maximum density threshold levels. The volume of each region receiving at least 5, 10, 15, 20, 30, and 40 Gy was calculated. The endpoint was grade ≥3 HT (HT3+). Normal-tissue complication probability (NTCP) was evaluated with the Lyman-Kutcher-Burman (LKB) model. Maximal likelihood estimate was used to compare the parameter set. Logistic regression was used to test associations between HT and both dosimetric and clinical parameters. RESULTS: Ten patients (31%) experienced HT3+. While dose to both LSS and PBM significantly predicted for HT3+, LSS was superior to PBM by logistic regression and LKB modeling. Constrained optimization of the LKB model for HT3+ yielded the parameters m = 0.21, n = 1, and TD50 = 32 Gy for LSS. The NTCP fits were better with the whole bone than with marrow cavity using any HU threshold. Mean LSS doses of 21 Gy and 23.5 Gy result in a 5% and 10% risk of HT3+, respectively. Mean dose and low-dose radiation parameters (V5, V10, V15, V20) of whole bone or bone cavities of LSS were correlated most significantly with HT3+. CONCLUSIONS: For predicting the risk of HT3+, whole-bone contours were superior to marrow cavity and LSS was superior to PBM by LKB modeling. The results confirm PBM and LSS as parallel organs when predicting hematologic toxicity. Recommended dose constraints to the LSS are V10 ≤80%. An LSS mean dose of 23.5 Gy is associated with a 10% risk of HT.
Authors: Diana A R Julie; Jung Hun Oh; Aditya P Apte; Joseph O Deasy; Ashlyn Tom; Abraham J Wu; Karyn A Goodman Journal: Acta Oncol Date: 2015-05-18 Impact factor: 4.089
Authors: Talha Shaikh; Lora S Wang; Brian Egleston; Meher Burki; John P Hoffman; Steven J Cohen; Joshua E Meyer Journal: Am J Clin Oncol Date: 2018-01 Impact factor: 2.339
Authors: P Franco; R Ragona; F Arcadipane; M Mistrangelo; P Cassoni; N Rondi; M Morino; P Racca; U Ricardi Journal: Clin Transl Oncol Date: 2016-04-01 Impact factor: 3.405
Authors: Samantha Warren; Christopher N Hurt; Thomas Crosby; Mike Partridge; Maria A Hawkins Journal: Int J Radiat Oncol Biol Phys Date: 2017-07-29 Impact factor: 7.038