Is pre-therapeutical FDG-PET/CT capable to detect high risk tumor subvolumes responsible for local failure in non-small cell lung cancer?

Radiother Oncol. 2009 Jun;91(3):399-404. doi: 10.1016/j.radonc.2009.01.003. Epub 2009 Jan 23.


Background and purpose: Local failure is a significant issue following radiotherapy (RT) for patients with non-small cell lung cancer (NSCLC). The aim of this study was to find out whether FDG-PET/CT is capable to predict tumor relapse location in patients with NSCLC, in particular to determine high risk tumors' subvolumes responsible for local failure.

Material and methods: Ten patients with locoregional relapse of NSCLC underwent FDG-PET/CT before, during, and in the 4-12 months following curative chemoradiotherapy (ChRT, 66 Gy) using a combined PET/CT scanner. Morphologic and metabolic tumor volumetry and an evaluation of FDG-uptake dynamics were performed.

Results: CT showed partial reduction of tumor volume after RT in all patients. PET-revealed partial in eight patients and complete metabolic response in two patients during RT. Six to nine months after RT, local failure was diagnosed in all patients with both methods. Tumor recurrences were localized mostly in the most active ones of pre-therapeutically metabolic regions of the primary tumor.

Conclusions: Local failure in NSCLC appears most common at the primary site and within the irradiated target volume with the highest FDG uptake. This observation may be useful for further optimization of radiotherapy of NSCLC, for example, by the application of additional radiation dose to subvolumes of primary tumors with higher FDG uptake.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Aged
  • Aged, 80 and over
  • Analysis of Variance
  • Carcinoma, Non-Small-Cell Lung / diagnostic imaging*
  • Carcinoma, Non-Small-Cell Lung / pathology
  • Carcinoma, Non-Small-Cell Lung / radiotherapy
  • Female
  • Fluorodeoxyglucose F18* / pharmacokinetics
  • Humans
  • Lung Neoplasms / diagnostic imaging*
  • Lung Neoplasms / pathology
  • Lung Neoplasms / radiotherapy
  • Male
  • Middle Aged
  • Neoplasm Recurrence, Local
  • Neoplasm Staging
  • Radiopharmaceuticals* / pharmacokinetics
  • Radiotherapy Planning, Computer-Assisted / methods*
  • Survival Rate
  • Tomography, Emission-Computed / methods*
  • Tomography, X-Ray Computed / methods*
  • Tumor Burden


  • Radiopharmaceuticals
  • Fluorodeoxyglucose F18