Indications
|
- MDT diagnosis of NSCLC based on findings of positive histology or a positive PET scan when predictive models (e.g. Herder, Brock) indicate a > 70% risk of malignancy (Callister et al BTS guidelines)
- Clinical stages of T1 N0 M0 or T2 (< 5cm) No Mo or a subset of T3 (by virtue of chest wall invasion only) (< 5cm)
- Not suitable for surgery because of medical co-morbidity, lesion is technically inoperable or patient declines surgery after surgical assessment (or option of assessment)
- Peripheral lesions, defined as outside the IASLC ‘central’ zone
- Age > 18 years
|
Performance status
|
0-3
|
Pulmonary function
|
No absolute constraints for FEV1 or DLCO, but patients with interstitial lung disease or established lung fibrosis should be treated with caution.
|
Relative contraindications
|
Target motion due to respiration ≥ 1cm despite techniques to reduce tumour motion
Presence of pulmonary fibrosis (consider and consent for increased risk of significant toxicity) - NOTE in which case referral to respiratory physicians to discuss convenience of treatment and enhanced measures/follow up from their department strongly encouraged.
PS3 (due to reason for poor PS being co-morbidities rather than disease)
|
Exclusion
|
- Any tumour not clinically definable on the treatment planning CT scan e.g. surrounded by consolidation or atelectasis.
- Tumour with respiratory motion ≥ 1cm, only proceed with treatment if target delineation is reliable and suggested normal tissue and tumour planning constraints can be achieved.
- Previous radiotherapy within the planned treatment volume; SABR may be offered in selected cases after consideration of potential risks of re-treatment.
- Chemotherapy administered within previous 6 weeks or < 6 weeks following SABR.
- Pregnant or lactating females
- Inability to obtain consent or comply with treatment requirements
|
Dose
|
54Gy/3/5-8d Peripheral lesion, T1, no OAR issues 55Gy/5/10-14d T2 or close to chest wall 50Gy/5/10-14d Abut or overlap central area 60Gy/8/17-19d PTV close to great vessels or can’t meet OAR (Fractionations here given 2-3 times per week)
|
Definitions Central and Ultracentral
Central lung lesion: GTV within 2cm in all directions of the proximal bronchial tree (as defined above) and/or immediately adjacent (defined as where PTV expected to touch) the mediastinal/pericardial pleura or brachial plexus. Central lesions will be considered eligible for treatment within this protocol.
Ultra-central lung lesion: Ultra-central lung lesion: Any lesion whose PTV touches or overlaps the proximal bronchial tree, oesophagus or pulmonary artery will be considered as ultra-central. Patients with ultra-central lung lesions will not currently be treated out with a clinical trial.