title: Analysis of clinical and dosimetric factors associated with severe acute radiation pneumonitis in patients with locally advanced non-small cell lung cancer treated with concurrent chemotherapy and intensity-modulated radiotherapy.
abstract: BACKGROUND
  To evaluate the association between the clinical, dosimetric factors and severe acute radiation pneumonitis (SARP) in patients with locally advanced non-small cell lung cancer (LANSCLC) treated with concurrent chemotherapy and intensity-modulated radiotherapy (IMRT).
  
  
  METHODS
  We analyzed 94 LANSCLC patients treated with concurrent chemotherapy and IMRT between May 2005 and September 2006. SARP was defined as greater than or equal 3 side effects and graded according to Common Terminology Criteria for Adverse Events (CTCAE) version 3.0. The clinical and dosimetric factors were analyzed. Univariate and multivariate logistic regression analyses were performed to evaluate the relationship between clinical, dosimetric factors and SARP.
  
  
  RESULTS
  Median follow-up was 10.5 months (range 6.5-24). Of 94 patients, 11 (11.7%) developed SARP. Univariate analyses showed that the normal tissue complication probability (NTCP), mean lung dose (MLD), relative volumes of lung receiving more than a threshold dose of 5-60 Gy at increments of 5 Gy (V5-V60), chronic obstructive pulmonary disease (COPD) and Forced Expiratory Volume in the first second (FEV1) were associated with SARP (p < 0.05). In multivariate analysis, NTCP value (p = 0.001) and V10 (p = 0.015) were the most significant factors associated with SARP. The incidences of SARP in the group with NTCP > 4.2% and NTCP <or=4.2% were 43.5% and 1.4%, respectively (p < 0.01). The incidences of SARP in the group with V10 <or=50% and V10 >50% were 5.7% and 29.2%, respectively (p < 0.01).
  
  
  CONCLUSIONS
  NTCP value and V10 are the useful indicators for predicting SARP in NSCLC patients treated with concurrent chemotherapy and IMRT.
authors.affiliation: Department of Radiation Oncology, Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education), Peking University School of Oncology, Beijing Cancer Hospital & Institute, Beijing 100142, China.
authors.forename: Anhui
authors.initials: A
authors.lastname: Shi
authors.forename: Guangying
authors.initials: G
authors.lastname: Zhu
authors.forename: Hao
authors.initials: H
authors.lastname: Wu
authors.forename: Rong
authors.initials: R
authors.lastname: Yu
authors.forename: Fuhai
authors.initials: F
authors.lastname: Li
authors.forename: Bo
authors.initials: B
authors.lastname: Xu
mesh_terms: D000208:Acute Disease; D000971:Antineoplastic Combined Chemotherapy Protocols / Q000627:therapeutic use*; D002289:Carcinoma, Non-Small-Cell Lung / Q000188:drug therapy / Q000532:radiotherapy / Q000628:therapy*; D003131:Combined Modality Therapy; D004307:Dose-Response Relationship, Radiation; D005260:Female; D005500:Follow-Up Studies; D005541:Forced Expiratory Volume / Q000187:drug effects / Q000528:radiation effects; D006801:Humans; D008175:Lung Neoplasms / Q000188:drug therapy / Q000532:radiotherapy / Q000628:therapy*; D008297:Male; D008875:Middle Aged; D009364:Neoplasm Recurrence, Local / Q000188:drug therapy / Q000473:pathology / Q000532:radiotherapy; D029424:Pulmonary Disease, Chronic Obstructive / Q000175:diagnosis / Q000209:etiology; D017564:Radiation Pneumonitis / Q000175:diagnosis / Q000209:etiology*; D050397:Radiotherapy, Intensity-Modulated / Q000009:adverse effects*; D016896:Treatment Outcome
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