BACKGROUND AND PURPOSE: We reported the incidence of severe late esophagus toxicity (LET) in locally advanced NSCLC patients treated with intensity-modulated radiation therapy (IMRT) and concurrent chemotherapy. Acute esophagus toxicity (AET) and the dose to the esophagus were analyzed for their associations with severe LET. MATERIAL AND METHODS: Two hundred and thirty-one patients treated from 2008 to 2011 with hypofractionated IMRT (66Gy/24fx) and concurrent daily low dose cisplatin were included. The association between AET and severe LET (grade ≥ 3 RTOG/EORTC) was tested through Cox-proportional-hazards model. Equivalent uniform dose (EUD) to the esophagus and the volume percentage receiving more than x Gy (Vx) were applied by Lyman-Kutcher-Burman (LKB) model. RESULTS: A total of 171 patients were eligible for this study. Severe LET was observed in 6% patients. Both the maximum grade and the recovery rate of AET were significantly associated with severe LET. In the EUDn-LKB model, the fitted values and 95% confidence intervals (CIs) were TD50=76.1 Gy (73.2-78.6), m=0.03 (0.02-0.06) and n=0.03 (0-0.08). In the Vx-LKB model, the fitted values and 95% CIs were Tx50=23.5% (16.4-46.6), m=0.44 (0.32-0.60) and x=76.7 Gy (74.7-77.5). CONCLUSIONS: Severe AET, EUD (n=0.03) and V76.7 to the esophagus were significantly associated with severe LET. An independent validation study is required.
BACKGROUND AND PURPOSE: We reported the incidence of severe late esophagus toxicity (LET) in locally advanced NSCLCpatients treated with intensity-modulated radiation therapy (IMRT) and concurrent chemotherapy. Acute esophagus toxicity (AET) and the dose to the esophagus were analyzed for their associations with severe LET. MATERIAL AND METHODS: Two hundred and thirty-one patients treated from 2008 to 2011 with hypofractionated IMRT (66Gy/24fx) and concurrent daily low dose cisplatin were included. The association between AET and severe LET (grade ≥ 3 RTOG/EORTC) was tested through Cox-proportional-hazards model. Equivalent uniform dose (EUD) to the esophagus and the volume percentage receiving more than x Gy (Vx) were applied by Lyman-Kutcher-Burman (LKB) model. RESULTS: A total of 171 patients were eligible for this study. Severe LET was observed in 6% patients. Both the maximum grade and the recovery rate of AET were significantly associated with severe LET. In the EUDn-LKB model, the fitted values and 95% confidence intervals (CIs) were TD50=76.1 Gy (73.2-78.6), m=0.03 (0.02-0.06) and n=0.03 (0-0.08). In the Vx-LKB model, the fitted values and 95% CIs were Tx50=23.5% (16.4-46.6), m=0.44 (0.32-0.60) and x=76.7 Gy (74.7-77.5). CONCLUSIONS: Severe AET, EUD (n=0.03) and V76.7 to the esophagus were significantly associated with severe LET. An independent validation study is required.
Authors: Noëlle van der Voort van Zyp; Masoma Hashimzadah; Erik Kouwenhoven; Carmen Liskamp; Christa Gadellaa-van Hooijdonk; Ellen Pouw; Jose Belderbos; Klaartje Maas; Paul van de Vaart; Mirjam Mast Journal: Clin Transl Radiat Oncol Date: 2022-07-07
Authors: David B Landau; Laura Hughes; Angela Baker; Andrew T Bates; Michael C Bayne; Nicholas Counsell; Angel Garcia-Alonso; Susan V Harden; Jonathan D Hicks; Simon R Hughes; Marianne C Illsley; Iftekhar Khan; Virginia Laurence; Zafar Malik; Helen Mayles; William Philip M Mayles; Elizabeth Miles; Nazia Mohammed; Yenting Ngai; Emma Parsons; James Spicer; Paula Wells; Dean Wilkinson; John D Fenwick Journal: Int J Radiat Oncol Biol Phys Date: 2016-03-28 Impact factor: 7.038