Comparative Analysis of Dosimetric and Clinical Results in SBRT for Lung Cancer

Overview

This study compares isocenter-based and volume-based dose prescriptions in SBRT for early-stage NSCLC. Volume-based prescriptions demonstrated superior dosimetric outcomes and improved clinical efficacy without increasing pulmonary toxicity.

Background

Stereotactic body radiotherapy (SBRT) is the standard treatment for medically inoperable early-stage non-small cell lung cancer (NSCLC). The choice of dose prescription method is crucial, as it can significantly impact treatment outcomes and toxicity profiles. Understanding the differences between isocenter-based and volume-based prescriptions is essential for optimizing patient care.

Data Highlights

Key Findings

• Volume-based prescriptions improved planning target volume (PTV) coverage to 95%.
• Higher minimum, mean, and maximum doses were achieved with volume-based prescriptions (p < 0.01).
• Volume-based planning reduced lung radiation exposure, indicated by lower mean lung doses (p < 0.01).
• Three-year overall survival was significantly higher in the volume-based group (95.0% vs. 64.0%, p = 0.01).
• Local control rates were also superior in the volume-based group (93.0% vs. 72.0%, p = 0.025).
• Incidence of Grade 2–5 radiation pneumonitis was comparable between both groups (p = 0.617).

Clinical Implications

The findings support the adoption of volume-based dose prescriptions in SBRT for early-stage NSCLC, as they enhance both dosimetric quality and clinical outcomes. Clinicians should consider this approach to optimize treatment efficacy while minimizing toxicity.

Conclusion

Volume-based SBRT prescriptions represent a significant advancement in the treatment of early-stage NSCLC, offering improved outcomes without increasing the risk of radiation pneumonitis. This approach should be prioritized in clinical practice.

Related Resources & Content

1. The ASCO Post, 2016 -- Intensity-Modulated vs Three-Dimensional Conformal External-Beam Radiation Therapy in Locally Advanced Non–Small Cell Lung Cancer
2. The ASCO Post, 2023 -- Individualized SABR for Lung Tumors
3. Journal of Neuro-Oncology -- Assessing the Precision of Contouring and Dosimetric Effects in Contemporary MRI-Guided Adaptive Radiation Therapy for Brain Metastases: A Retrospective Analysis
4. Frontiers in Oncology -- Advanced dose calculation strategies for clinical linear accelerators: a systematic review
5. Management of Patients With Early-Stage Non-Small Cell Lung Cancer | Thoracic Oncology - American College of Chest Physicians
6. RADIATION THERAPY ONCOLOGY GROUP RTOG 0236 A
7. Stereotactic radiotherapy for lung cancer: Influence of prescription modality on clinical outcome - ScienceDirect
8. Management of Patients With Early-Stage Non-Small Cell Lung Cancer | Thoracic Oncology - American College of Chest Physicians
9. RADIATION THERAPY ONCOLOGY GROUP RTOG 0236 A
10. Stereotactic radiotherapy for lung cancer: Influence of prescription modality on clinical outcome - ScienceDirect