title: Influence of Surveillance PET/CT on Detection of Early Recurrence After Definitive Radiation in Stage III Non-small-cell Lung Cancer.
abstract: There are few data to support the use of varying imaging modalities in evaluating recurrence in non-small-cell lung cancer (NSCLC). We compared the efficacy of surveillance positron emission tomography (PET)/computed tomography (CT) versus CT scans of the chest in detecting recurrences after definitive radiation for NSCLC.
  
  
  
  We retrospectively analyzed 200 patients treated between 2000 and 2011 who met the inclusion criteria of stage III NSCLC, completion of definitive radiation treatment, and absence of recurrence within the initial 6 months. These patients were then grouped on the basis of the use of PET/CT imaging during postradiation surveillance. Patients who received ≥ 1 PET/CT scans within 6 months of the end of radiation treatment were placed in the PET group whereas all others were placed in the CT group. We compared survival times from the end of treatment to the date of death or last follow-up using log rank tests. Multivariate analysis was conducted to identify factors associated with decreased survival.
  
  
  
  In the entire cohort, median event-free survival (EFS) was 26.7 months, and median overall survival (OS) was 41.2 months. The CT group had a median EFS of 21.4 months versus 29.4 months for the PET group (P = .59). There was no difference in OS between the CT and PET groups (median OS of 41.2 and 41.3 months, respectively; P = .59). There was also no difference in local recurrence-free survival or distant metastases-free survival between the CT-only and PET/CT groups (P = .92 and P = .30, respectively). Similarly, in multivariate analysis, stratification into the PET group was not associated with improved EFS (hazard ratio [HR], 0.90; 95% confidence interval [CI], 0.61-1.34; P = .60) or OS (HR, 1.2; 95% CI, 0.83-1.7; P = .34).
  
  
  
  In stage III NSCLC patients treated with definitive radiation and without early recurrence, PET/CT scan surveillance did not result in decreased time to detection of locoregional or distant recurrence or improved survival.
authors.affiliation: Department of Radiation Oncology, The University of Texas M.D. Anderson Cancer Center, Houston, TX.
authors.forename: Jay P
authors.initials: JP
authors.lastname: Reddy
authors.affiliation: Department of Radiation Oncology, The University of Texas M.D. Anderson Cancer Center, Houston, TX.
authors.forename: Chad
authors.initials: C
authors.lastname: Tang
authors.affiliation: Department of Health Services Research, The University of Texas M.D. Anderson Cancer Center, Houston, TX.
authors.forename: Tina
authors.initials: T
authors.lastname: Shih
authors.affiliation: Department of Health Services Research, The University of Texas M.D. Anderson Cancer Center, Houston, TX; School of Public Health, The University of Texas Health Science Center at Houston, Houston, TX.
authors.forename: Bumyang
authors.initials: B
authors.lastname: Kim
authors.affiliation: Department of Radiation Oncology, The University of Texas M.D. Anderson Cancer Center, Houston, TX.
authors.forename: Charissa
authors.initials: C
authors.lastname: Kim
authors.affiliation: Department of Radiation Oncology, The University of Texas M.D. Anderson Cancer Center, Houston, TX.
authors.forename: Quynh-Nhu
authors.initials: QN
authors.lastname: Nguyen
authors.affiliation: Department of Radiation Oncology, The University of Texas M.D. Anderson Cancer Center, Houston, TX.
authors.forename: James
authors.initials: J
authors.lastname: Welsh
authors.affiliation: Department of Diagnostic Radiology, The University of Texas M.D. Anderson Cancer Center, Houston, TX.
authors.forename: Marcelo
authors.initials: M
authors.lastname: Benveniste
authors.affiliation: Department of Thoracic Medical Oncology, The University of Texas M.D. Anderson Cancer Center, Houston, TX.
authors.forename: Jianjun
authors.initials: J
authors.lastname: Zhang
authors.affiliation: Department of Radiation Oncology, The University of Texas M.D. Anderson Cancer Center, Houston, TX.
authors.forename: Zhongxing
authors.initials: Z
authors.lastname: Liao
authors.affiliation: Department of Radiation Oncology, The University of Texas M.D. Anderson Cancer Center, Houston, TX. Electronic address: dgomez@mdanderson.org.
authors.forename: Daniel R
authors.initials: DR
authors.lastname: Gomez
mesh_terms: D000230:Adenocarcinoma / Q000473:pathology / Q000532:radiotherapy*; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002289:Carcinoma, Non-Small-Cell Lung / Q000473:pathology / Q000532:radiotherapy*; D002294:Carcinoma, Squamous Cell / Q000473:pathology / Q000532:radiotherapy*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008175:Lung Neoplasms / Q000473:pathology / Q000532:radiotherapy*; D008297:Male; D008875:Middle Aged; D009364:Neoplasm Recurrence, Local / Q000175:diagnosis* / Q000000981:diagnostic imaging*; D009367:Neoplasm Staging; D000072078:Positron Emission Tomography Computed Tomography / Q000379:methods*; D011379:Prognosis; D011879:Radiotherapy Dosage; D012189:Retrospective Studies; D015996:Survival Rate
keywords: CT; Lung cancer; PET/CT; Radiation; Recurrence; Surveillance