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The prognosis and effects of local treatment strategies for orbital embryonal rhabdomyosarcoma: a population-based study.

Introduction: Orbital embryonal rhabdomyosarcoma is a rare childhood malignancy with a good prognosis, but the optimal treatment remains unclear. Using a population-based cancer registry, we assessed the prognoses and survival outcomes of patients with orbital embryonal rhabdomyosarcoma according to the local treatment strategy.

Patients and methods: Patients diagnosed with orbital embryonal rhabdomyosarcoma between 1988 and 2012 as part of the Surveillance Epidemiology and End Results program were included. Univariate and multivariate Cox regression analyses were performed to determine the prognostic factors associated with cause-specific survival (CSS) and overall survival (OS).

Results: In total, 102 patients were included; their median age was 6 years, 78.4% were white, and 56.9% were male. The median tumor size was 30 mm. Of 20 patients with an available histologic grade, the tumors of 90% were poorly differentiated/undifferentiated. Of 92 patients with available surgical and radiotherapy (RT) statuses, 50 (54.3%), 36 (39.1%), and 6 (6.5%) received surgery and RT, primary RT, and primary surgery, respectively. Ninety-five patients (93.1%) received chemotherapy. The 5- and 10-year CSSs of the entire cohort were 94.3% and 92.2%, respectively. The 5- and 10-year OSs were 93.3% and 91.3%, respectively. In 95 patients who were followed up for at least 12 months, there were no significant prognostic factors related to CSS and OS. Furthermore, the local treatment strategy did not significantly affect CSS ( P =0.29) or OS ( P =0.468).

Conclusion: There is no local treatment of choice for orbital embryonal rhabdomyosarcoma in terms of survival. However, RT is a reasonable alternative treatment to surgery.

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