In rhabdomyosarcoma, the proliferating cells are called .
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A 15-year-old boy comes to his pediatrician's office because of a mass on his buttock which has been growing steadily for the past 4 months. He reports the mass being painless. Biopsy and histological examination shows a mass is similar to that of alveolar tissue. A diagnosis of rhabdomyosarcoma is made. What is the next best step in the treatment of this patient?