title: Feasibility and efficacy of simultaneous integrated boost intensity-modulated radiation therapy in patients with limited-disease small cell lung cancer.
abstract: OBJECTIVE
  To evaluate the feasibility and efficacy of simultaneous integrated boost intensity-modulated radiation therapy (SIB-IMRT) in patients with limited-disease small-cell lung cancer (LD-SCLC).
  
  
  METHODS
  Patients with LD-SCLC were treated with SIB-IMRT within 1 week after completion of 2 cycles of induction chemotherapy. Then 2-4 cycles of adjuvant chemotherapy were administered within 1 week after SIB-IMRT. Irradiation was given accelerated hyper-fractionated with the prescribed dose 57Gy at 1.9Gy twice daily to the gross tumor volume (GTV) , 51Gy at 1.7Gy twice daily to the clinical tumor volume (CTV) and 45Gy at 1.5Gy twice daily to the planning target volume (PTV). The chemotherapy regimen consisted of platinum plus etoposide. Prophylactic cranial radiation (25Gy in 10 fractions) was administered to patients who got complete response (CR) or near complete response (nCR). The primary endpoint of this study was the frequency of grade 3 or higher acute non-hematologic treatment-related toxicities. Secondary end points included objective response, overall survival (OS), progression-free survival (PFS), locoregional recurrence-free survival (LRFS).
  
  
  RESULTS
  A cohort of 35 patients were enrolled in the study, the biological equivalent dose (BED) of the GTV in the SIB-IMRT was 59.16Gy. Grade 1, 2, and 3 esophagitis were observed in 11 (31%), 12 (34%), and 6 (17%) patients, respectively; Grade 1 and 2 pneumonitis were observed in 8 (23%) and 4 (11%) patients, respectively. The median OS and PFS of the whole group were 37.7 months and 29.3 months, respectively. The 1- and 2-year OS was 94.1% and 68.5%, respectively. The 1- and 2-year PFS was 76.8% and 40.7%, respectively. The 1- and 2-year LRFS was 87.7% and 73.8%, respectively.
  
  
  CONCLUSIONS
  SIB-IMRT was feasible and well-tolerated in patients with LD-SCLC, and worth further evaluating in a large prospective clinical trial.
authors.affiliation: Department of 6th Radiation Oncology, Cancer Prevention and Treatment Institute of Shandong Province, Shandong, 250117, China. echohandan@163.com.|School of Medicine and Life Sciences, University of Jinan-Shandong Academy of Medical Sciences, Shandong, 250062, China. echohandan@163.com.
authors.forename: Dan
authors.initials: D
authors.lastname: Han
authors.affiliation: Department of 6th Radiation Oncology, Cancer Prevention and Treatment Institute of Shandong Province, Shandong, 250117, China. 271648525@qq.com.
authors.forename: Qin
authors.initials: Q
authors.lastname: Qin
authors.affiliation: Department of Thoraic Surgery, Cancer Prevention and Treatment Institute of Shandong Province, Shandong, 250117, China. haoshaoyu88@163.com.
authors.forename: Shaoyu
authors.initials: S
authors.lastname: Hao
authors.affiliation: Department of 6th Radiation Oncology, Cancer Prevention and Treatment Institute of Shandong Province, Shandong, 250117, China. alvinbird@163.com.
authors.forename: Wei
authors.initials: W
authors.lastname: Huang
authors.affiliation: Department of 6th Radiation Oncology, Cancer Prevention and Treatment Institute of Shandong Province, Shandong, 250117, China. 1824039358@qq.com.
authors.forename: Yumei
authors.initials: Y
authors.lastname: Wei
authors.affiliation: Department of 6th Radiation Oncology, Cancer Prevention and Treatment Institute of Shandong Province, Shandong, 250117, China. 547003297@qq.com.
authors.forename: Zicheng
authors.initials: Z
authors.lastname: Zhang
authors.affiliation: Department of 6th Radiation Oncology, Cancer Prevention and Treatment Institute of Shandong Province, Shandong, 250117, China. wangzt@163.com.
authors.forename: Zhongtang
authors.initials: Z
authors.lastname: Wang
authors.affiliation: Department of 6th Radiation Oncology, Cancer Prevention and Treatment Institute of Shandong Province, Shandong, 250117, China. baoshli1963@163.com.
authors.forename: Baosheng
authors.initials: B
authors.lastname: Li
mesh_terms: D000328:Adult; D000368:Aged; D000971:Antineoplastic Combined Chemotherapy Protocols / Q000008:administration & dosage; D059248:Chemoradiotherapy / Q000379:methods; D018572:Disease-Free Survival; D005260:Female; D006801:Humans; D053208:Kaplan-Meier Estimate; D008175:Lung Neoplasms / Q000188:drug therapy / Q000473:pathology / Q000532:radiotherapy*; D008297:Male; D008875:Middle Aged; D050397:Radiotherapy, Intensity-Modulated / Q000379:methods*; D055752:Small Cell Lung Carcinoma / Q000188:drug therapy / Q000473:pathology / Q000532:radiotherapy*