Jamie M Aye1, Yueh-Yun Chi2, Jing Tian2, Erin R Rudzinski3, Odion T Binitie4, Roshni Dasgupta5, Suzanne L Wolden6, Douglas S Hawkins7, Abha A Gupta8. 1. Department of Pediatrics, Children's of Alabama, University of Alabama at Birmingham, Birmingham, Alabama. 2. Department of Biostatistics, College of Public Health and Health Professions College of Medicine, University of Florida, Gainesville, Florida. 3. Department of Pathology, Seattle Children's Hospital, University of Washington, Seattle, Washington. 4. Department of Surgery, Johns Hopkins All Children's Hospital, St. Petersburg, Florida. 5. Department of Pediatric General and Thoracic Surgery, Cincinnati Children's Medical Center, University of Cincinnati, Cincinnati, Ohio. 6. Department of Radiation Oncology, Memorial Sloan Kettering Cancer Center, New York, New York. 7. Department of Pediatrics, Seattle Children's Hospital, University of Washington, Seattle, Washington. 8. Department of Pediatrics, Hospital for Sick Children, University of Toronto, Toronto, Canada.
Abstract
BACKGROUND: The role of adjuvant radiotherapy (RT) remains unclear in patients with localized, completely resected (group I) alveolar rhabdomyosarcoma (ARMS). PROCEDURE: Patients with group I ARMS enrolled on any one of three prior Children's Oncology Group (COG) clinical trials (D9602, D9803, or ARST0531) were analyzed. All patients received systemic chemotherapy and 36 Gy adjuvant RT (if given) to the primary site at week 12 or week 4 for D9602/D9803 and ARST0531, respectively. RESULTS: Thirty-six patients with group I ARMS were treated on D9602 (n = 6), D9803 (n = 17), or ARST0531 (n = 13), of whom 24 (67%) were male. The median age was 4.1 years (range, 0.8-45.8). Twenty (56%) patients had an unfavorable primary site, and 10 (28%) had tumors > 5 cm. FOXO1-fusion status was negative, positive, and unknown in 10 (28%), 15 (42%), and 11 (30%) tumors, respectively. Twenty-two (61%) patients received RT. Overall, the four-year event-free survival (EFS) and overall survival (OS) were 70.8% and 88.3%, respectively. Patients with FOXO1 positivity who received RT had superior EFS compared with those who did not (77.8% vs 16.7%; P = 0.03). Among 10 patients who were FOXO1 negative, the outcome was similar with or without RT. CONCLUSIONS: Although limited by a small sample size, data from this study support the routine use of adjuvant RT in patients with FOXO1-positive disease even after complete resection. Additionally, omitting adjuvant RT is rational for patients with FOXO1-negative ARMS and will be prospectively investigated in the current COG trial ARST1431.
BACKGROUND: The role of adjuvant radiotherapy (RT) remains unclear in patients with localized, completely resected (group I) alveolar rhabdomyosarcoma (ARMS). PROCEDURE: Patients with group I ARMS enrolled on any one of three prior Children's Oncology Group (COG) clinical trials (D9602, D9803, or ARST0531) were analyzed. All patients received systemic chemotherapy and 36 Gy adjuvant RT (if given) to the primary site at week 12 or week 4 for D9602/D9803 and ARST0531, respectively. RESULTS: Thirty-six patients with group I ARMS were treated on D9602 (n = 6), D9803 (n = 17), or ARST0531 (n = 13), of whom 24 (67%) were male. The median age was 4.1 years (range, 0.8-45.8). Twenty (56%) patients had an unfavorable primary site, and 10 (28%) had tumors > 5 cm. FOXO1-fusion status was negative, positive, and unknown in 10 (28%), 15 (42%), and 11 (30%) tumors, respectively. Twenty-two (61%) patients received RT. Overall, the four-year event-free survival (EFS) and overall survival (OS) were 70.8% and 88.3%, respectively. Patients with FOXO1 positivity who received RT had superior EFS compared with those who did not (77.8% vs 16.7%; P = 0.03). Among 10 patients who were FOXO1 negative, the outcome was similar with or without RT. CONCLUSIONS: Although limited by a small sample size, data from this study support the routine use of adjuvant RT in patients with FOXO1-positive disease even after complete resection. Additionally, omitting adjuvant RT is rational for patients with FOXO1-negative ARMS and will be prospectively investigated in the current COG trial ARST1431.
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