A Argiris1, J E Bauman2, J Ohr3, W E Gooding4, D E Heron5, U Duvvuri6, G J Kubicek7, D M Posluszny8, M Vassilakopoulou9, S Kim6, J R Grandis10, J T Johnson6, M K Gibson11, D A Clump5, J T Flaherty2, S I Chiosea12, B Branstetter5, R L Ferris6. 1. Department of Medicine, University of Texas Health Science Center at San Antonio, San Antonio athanassios.argiris@gmail.com. 2. Division of Hematology/Oncology, Department of Medicine. 3. Department of Medicine, Division of Hematology/Oncology. 4. Department of Biostatistics. 5. Department of Medicine, Division of Radiation Oncology, University of Pittsburgh Cancer Institute, Pittsburgh. 6. Division of Otolaryngology, Department of Medicine, University of Pittsburgh, Pittsburgh. 7. Division of Radiation Oncology, Department of Medicine, Cooper University Healthcare, Camden. 8. Division of Biobehavioral Oncology, Department of Medicine, University of Pittsburgh Cancer Institute, Pittsburgh, USA. 9. Division of Hematology/Oncology, Department of Medicine, Hopital de la Pitie-Salpetriere, Paris, France. 10. Division of Otolaryngology, Department of Medicine, University of California, San Francisco. 11. Division of Hematology/Oncology, Department of Medicine, UH Case Medical Center, Cleveland. 12. Division of Pathology, Department of Medicine, University of Pittsburgh, Pittsburgh, USA.
Abstract
BACKGROUND: We previously reported the safety of concurrent cetuximab, an antibody against epidermal growth factor receptor (EGFR), pemetrexed, and radiation therapy (RT) in patients with locally advanced squamous cell carcinoma of the head and neck (SCCHN). In this non-comparative phase II randomized trial, we evaluated this non-platinum combination with or without bevacizumab, an inhibitor of vascular endothelial growth factor (VEGF). PATIENTS AND METHODS: Patients with previously untreated stage III-IVB SCCHN were randomized to receive: conventionally fractionated radiation (70 Gy), concurrent cetuximab, and concurrent pemetrexed (arm A); or the identical regimen plus concurrent bevacizumab followed by bevacizumab maintenance for 24 weeks (arm B). The primary end point was 2-year progression-free survival (PFS), with each arm compared with historical control. Exploratory analyses included the relationship of established prognostic factors to PFS and quality of life (QoL). RESULTS:Seventy-eight patients were randomized: 66 oropharynx (42 HPV-positive, 15 HPV-negative, 9 unknown) and 12 larynx; 38 (49%) had heavy tobacco exposure. Two-year PFS was 79% [90% confidence interval (CI) 0.69-0.92; P < 0.0001] for arm A and 75% (90% CI 0.64-0.88; P < 0.0001) for arm B, both higher than historical control. No differences in PFS were observed for stage, tobacco history, HPV status, or type of center (community versus academic). A significantly increased rate of hemorrhage occurred in arm B. SCCHN-specific QoL declined acutely, with marked improvement but residual symptom burden 1 year post-treatment. CONCLUSIONS: RT with a concurrent non-platinum regimen of cetuximab and pemetrexed is feasible in academic and community settings, demonstrating expected toxicities and promising efficacy. Adding bevacizumab increased toxicity without apparent improvement in efficacy, countering the hypothesis that dual EGFR-VEGF targeting would overcome radiation resistance, and enhance clinical benefit. Further development of cetuximab, pemetrexed, and RT will require additional prospective study in defined, high-risk populations where treatment intensification is justified.
RCT Entities:
BACKGROUND: We previously reported the safety of concurrent cetuximab, an antibody against epidermal growth factor receptor (EGFR), pemetrexed, and radiation therapy (RT) in patients with locally advanced squamous cell carcinoma of the head and neck (SCCHN). In this non-comparative phase II randomized trial, we evaluated this non-platinum combination with or without bevacizumab, an inhibitor of vascular endothelial growth factor (VEGF). PATIENTS AND METHODS: Patients with previously untreated stage III-IVB SCCHN were randomized to receive: conventionally fractionated radiation (70 Gy), concurrent cetuximab, and concurrent pemetrexed (arm A); or the identical regimen plus concurrent bevacizumab followed by bevacizumab maintenance for 24 weeks (arm B). The primary end point was 2-year progression-free survival (PFS), with each arm compared with historical control. Exploratory analyses included the relationship of established prognostic factors to PFS and quality of life (QoL). RESULTS: Seventy-eight patients were randomized: 66 oropharynx (42 HPV-positive, 15 HPV-negative, 9 unknown) and 12 larynx; 38 (49%) had heavy tobacco exposure. Two-year PFS was 79% [90% confidence interval (CI) 0.69-0.92; P < 0.0001] for arm A and 75% (90% CI 0.64-0.88; P < 0.0001) for arm B, both higher than historical control. No differences in PFS were observed for stage, tobacco history, HPV status, or type of center (community versus academic). A significantly increased rate of hemorrhage occurred in arm B. SCCHN-specific QoL declined acutely, with marked improvement but residual symptom burden 1 year post-treatment. CONCLUSIONS: RT with a concurrent non-platinum regimen of cetuximab and pemetrexed is feasible in academic and community settings, demonstrating expected toxicities and promising efficacy. Adding bevacizumab increased toxicity without apparent improvement in efficacy, countering the hypothesis that dual EGFR-VEGF targeting would overcome radiation resistance, and enhance clinical benefit. Further development of cetuximab, pemetrexed, and RT will require additional prospective study in defined, high-risk populations where treatment intensification is justified.
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