LRT for a stage IIIA lung tumor as upfront boost (61 ): 18 Gy to the vertices, 3 Gy to the periphery of the PTV. Panel A (top row): Dose distribution. Panel B: Tumor prior to treatment. Panel C: Follow-up PET-CT 15 months after LRT followed by 2 Gy × 29 fractions of VMAT.