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- W1602493743 abstract "BACKGROUND: The use of radiation therapy (RT) “cone-down” boost to reduce high-dose treatment volumes according to tumor response to induction chemotherapy in patients with pediatric rhabdomyosarcoma (RMS) may reduce treatment morbidity, yet the impact on tumor control is unknown. METHODS: Fifty-five children, including 18 (33%) with parameningeal (PM) RMS and 37 (67%) with non-PM RMS, who received definitive treatment with chemotherapy and RT from April 2000 through January 2010 were retrospectively reviewed. RESULTS: In total, 28 patients (51%) received a cone-down boost. The high-dose boost volume was reduced by a median of 56% of the initial target volume (range, 5%-91%). The median time to initiating RT was 3 weeks for patients with PM RMS and 16 weeks for patients with non-PM RMS (P < .001). After a median follow-up of 41 months, local failure occurred in 5 patients (9%), including 2 patients who received a cone-down boost, and there were no marginal failures. Twelve patients (67%) with PM RMS had intracranial tumor extension. In this subgroup, 4 patients (30%) who received a cone-down boost and had ≥ 3 weeks between chemotherapy and RT initiation experienced leptomeningeal failure as their first site of disease progression, and a delayed time to RT initiation was associated with decreased survival (P = .055) CONCLUSIONS: A cone-down boost allowed for significant reductions in high-dose RT treatment volume while maintaining excellent tumor control in most patients. However, in the subset of patients with PM RMS and intracranial tumor extension, early RT initiation and wider margin RT to cover adjacent areas at high risk for meningeal extension may be more important for adequate disease control. Cancer 2013. © 2012 American Cancer Society." @default.
- W1602493743 created "2016-06-24" @default.
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- W1602493743 date "2012-12-27" @default.
- W1602493743 modified "2023-10-16" @default.
- W1602493743 title "Radiation therapy target volume reduction in pediatric rhabdomyosarcoma" @default.
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- W1602493743 doi "https://doi.org/10.1002/cncr.27934" @default.
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