To Evaluate the Impact of PET/CT on Radiation Treatment Planning in Relation to Changes in GTV in Stage 3 NSCLC

Lung Cancer Clinical Trial

Official title: A Prospective Observational Study to Evaluate the Impact of PET/CT Simulation on Radiation Treatment Planning in Relation to Changes in GTV in Locally Advanced Non-small Cell Lung Cancer

Status Terminated

Clinical Trial Summary

Acknowledging that level I evidence already exists regarding the general beneficial impact on FDG PET in the staging and subsequent management of lung cancer the investigators postulate that fusing PET/CT data sets with RT CT simulation data sets for adult patients with conventionally/clinically assessed stage III non-small cell lung cancer will have a significant impact on GTV as well as normal tissue irradiation. This research will also estimate inter and intra-observer variability of treatment planning, relative to GTV, between and amongst radiation oncologists.

Clinical Trial Description

Primary objectives of the study:

1.To determine the impact of PET/CT fusion on gross tumor volume ( GTV ) for primary(GTVP) and nodal (GTVN) disease for each patient by comparing GTV contours using two separate data sets.

(A) GTVP CT+ ve and GTVN CT+ ve

(B) GTVP PET+ve and GTVN PET +ve

GTV will be measured and recorded in cubic centimeters for each volume.

Secondary Endpoints:

1.Normal tissue toxicity:3D conformal Computerized radiation plans will be generated for the data sets GTVP and GTVN A and B .Dose Volume Histogram (DVH) will be determined and compared for the following normal tissue toxicity parameters.

I. V 20 Both lungs (Combined total lung volumes including PTV): Volume of both lungs receiving ≥ 20 G y, including planning target volume.

II. Mean lung dose: Mean radiation dose received by both lungs in a given radiation plan, calculated by the planning computer.

III. V 55 Esophagus: Volume of esophagus receiving≥ 55Gy.

IV. Mean esophageal dose : Mean radiation dose received by whole esophagus in a given radiation plan, calculated by the planning computer

V. Spinal cord dose: Maximum dose received by the spinal cord in a given radiation plan.

V1.. V40 Whole heart: Volume of heart receiving ≥ 40Gy

2A Inter observer variation: This will be determined for the data sets GTV A and B only delineated by 4 radiation oncologists blinded to each other, for first 20 patients. The resident involved in this project will be responsible to co-ordinate this part of the project. GTV will be measured and recorded in cubic centimeters for each volume.

2B Intra observer variation: This will be determined for the data sets GTV A and B only delineated by the same radiation oncologist (treating physician) at two different occasions, for first 20 patients. Minimum time interval between the two contours will be one month .The resident involved in this project will be responsible to co-ordinate this part of the project. GTV will be measured and recorded in cubic centimeters for each volume. ;

Study Design

Time Perspective: Prospective

Related Conditions & MeSH terms

• Lung Cancer
• Lung Neoplasms

• NCT number: NCT01888692
• Study type: Observational
• Source: University of Manitoba
• Status: Terminated
• Phase: N/A
• Start date: April 2007
• Completion date: December 2010