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Title: Incidence and Predictive Factors of Pain Flare After Spine Stereotactic Body Radiation Therapy: Secondary Analysis of Phase 1/2 Trials

Purpose/Objective(s): To perform a secondary analysis of institutional prospective spine stereotactic body radiation therapy (SBRT) trials to investigate posttreatment acute pain flare. Methods and Materials: Medical records for enrolled patients were reviewed. Study protocol included baseline and follow-up surveys with pain assessment by Brief Pain Inventory and documentation of pain medications. Patients were considered evaluable for pain flare if clinical note or follow-up survey was completed within 2 weeks of SBRT. Pain flare was defined as a clinical note indicating increased pain at the treated site or survey showing a 2-point increase in worst pain score, a 25% increase in analgesic intake, or the initiation of steroids. Binary logistic regression was used to determine predictive factors for pain flare occurrence. Results: Of the 210 enrolled patients, 195 (93%) were evaluable for pain flare, including 172 (88%) clinically, 135 (69%) by survey, and 112 (57%) by both methods. Of evaluable patients, 61 (31%) had undergone prior surgery, 57 (29%) had received prior radiation, and 34 (17%) took steroids during treatment, mostly for prior conditions. Pain flare was observed in 44 patients (23%). Median time to pain flare was 5 days (range, 0-20 days) after the start of treatment. On multivariate analysis, the only independentmore » factor associated with pain flare was the number of treatment fractions (odds ratio = 0.66, P=.004). Age, sex, performance status, spine location, number of treated vertebrae, prior radiation, prior surgery, primary tumor histology, baseline pain score, and steroid use were not significant. Conclusions: Acute pain flare after spine SBRT is a relatively common event, for which patients should be counseled. Additional study is needed to determine whether prophylactic or symptomatic intervention is preferred.« less
Authors:
;  [1] ;  [2] ;  [1] ;  [3] ; ;  [4] ;  [5] ;  [6] ;  [7] ;  [1] ;  [1]
  1. Department of Radiation Oncology, University of Texas MD Anderson Cancer, Houston, Texas (United States)
  2. Department of Symptom Research, University of Texas MD Anderson Cancer, Houston, Texas (United States)
  3. (United States)
  4. Department of Neurosurgery, University of Texas MD Anderson Cancer, Houston, Texas (United States)
  5. Department of Diagnostic Radiology, University of Texas MD Anderson Cancer, Houston, Texas (United States)
  6. Department of Radiation Physics, University of Texas MD Anderson Cancer, Houston, Texas (United States)
  7. Department of Genitourinary Medical Oncology, University of Texas MD Anderson Cancer, Houston, Texas (United States)
Publication Date:
OSTI Identifier:
22420476
Resource Type:
Journal Article
Resource Relation:
Journal Name: International Journal of Radiation Oncology, Biology and Physics; Journal Volume: 90; Journal Issue: 4; Other Information: Copyright (c) 2014 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
62 RADIOLOGY AND NUCLEAR MEDICINE; ANALGESICS; HISTOLOGY; INTAKE; MEDICAL RECORDS; MEDICAL SURVEILLANCE; MULTIVARIATE ANALYSIS; NEOPLASMS; PAIN; PATIENTS; RADIOTHERAPY; REVIEWS; STEROIDS; SURGERY; VERTEBRAE