SUNSET: SBRT for Ultra-central NSCLC- a Safety and Efficacy Trial

This multi-centre phase I dose-escalation study will use a time-to-event continual reassessment method (TIT-CRM). Accrual will start at level 1 (60 Gy in 8 fractions). Patients will be assigned to treatment doses using the TITE-CRM model. The model will use all available information from previously accrued patients to assign the highest dose with a predicted risk of grade 3 toxicity of 30% or less.