Toxicity and outcome results of RTOG 9311: A phase I-II dose-escalation study using three-dimensional conformal radiotherapy in patients with inoperable non-small-cell lung carcinoma

The radiation dose was safely escalated using three-dimensional conformal techniques to 83.8 Gy for patients with V20 values of <25% (Group 1) and to 77.4 Gy for patients with V20 values between 25% and 36% (Group 2), using fraction sizes of 2.15 Gy. The 90.3-Gy dose level was too toxic, resulting in dose-related deaths in 2 patients. Elective nodal failure occurred in <10% of patients.