The Utility of PET/CT in the Planning of Stereotactic Body Radiotherapy for Non-small Cell Lung Cancer
The trial evaluates the utility of 18FDG-PET/CT scan in the target definition process when SBRT is planned for stage I NSCLC.
|Study Design:||Allocation: Non-Randomized
Intervention Model: Single Group Assignment
Masking: Open Label
Primary Purpose: Treatment
- Concordance indices between CT-based and PET/CT-based target definitions versus volumes of surgical specimens
- Intra- and inter-individual variability of target definition
|Study Start Date:||June 2007|
|Estimated Study Completion Date:||July 2010|
|Primary Completion Date:||July 2010 (Final data collection date for primary outcome measure)|
The trial aims to evaluate the utility of 18FDG-PET/CT in SBRT planning for NSCLC with particular emphasis on the definition of macroscopic and microscopic boundaries of malignant growth. Studies indicate that the definition of the gross tumor volume may gain in quality when CT and 18FDG-PET are combined. In about 30-60% of NSCLC patients considered for radiotherapy, alteration of CT-based treatment volumes is the consequence of a supplementary 18FDG-PET scan. Studies examining the effect of combined PET/CT scans on the delineation of the GTV generally show reduced intra- and inter-clinician variability. Whether this higher degree of consistency is an actual improvement remains to be proven. Pathological specimens from operated NSCLC patients may serve as a gold standard in this respect. To meet the need for tight margins, the clinical target volume in SBRT planning is generally presumed to correspond to the GTV. Whether this clinical practice rests on firm ground is also an issue that can be addressed in a PET-CT-pathology correlation study.