A randomized study of high-dose split course radiotherapy preceded by high-dose chemotherapy versus high-dose radiotherapy only in locally advanced non-small-cell lung cancer. An EORTC Lung Cancer Cooperative Group trial

Abstract

Background: The treatment results of radiotherapy in stage III non-small-cell lung cancer are very poor. Several phase II studies showed that neoadjuvant chemotherapy followed by radiotherapy was feasible in this patient group and suggested that treatment outcome might improve. A randomized phase II study was performed addressing the response rate and morbidity of high-dose split course radiotherapy (RT) versus the same radiotherapy preceded by high-dose chemotherapy (CT) in patients with stage III non-small-cell lung cancer.

Patients and methods: Seventy eligible patients were randomized in this study. CT consisted of cisplatin 100 mg/m2 days 1 and 22, and vindesine 3 mg/m2 on days 1, 8, 22 and 29. Radiotherapy started on day 43 in the combined arm and immediately in the RT-only arm. The primary tumour and the regional nodes were treated by 30 Gy/10 fractions/2 weeks and after the split by a second course of 25 Gy/10 fractions/2 weeks. In the combined arm a third CT cycle was planned during the split between RT courses.

Results: In the CT + RT arm 34 patients were evaluable for response and toxicity and 30 patients in the RT only arm. After completion of treatment 7 patients had a complete response (2 in the CT plus RT arm, 5 in the RT alone arm) and 26 patients a partial response (13 in the CT plus RT arm, 13 in the RT alone arm) for an overall response rate of 52% (95% CI 39%-65%). Acute toxicity was worse in the combined treatment arm with grade 4 leucocytopenia in 8 patients and thrombocytopenia grade 4 in one patient. Three patients had reversible renal toxicity grade 2. There was one toxic death in the RT plus CT arm. There was no enhancement of acute or late radiation pulmonary or oesophageal toxicity. Time to progressive disease (median 30 vs. 35 weeks) and overall survival time (median 12 months) were equal in both treatment arms.

Conclusion: High-dose radiotherapy preceded by high-dose chemotherapy was more toxic than radiotherapy alone and did not result in this study in any benefit in terms of response rate, time to progressive disease and overall survival.