TABLE 1.

Intergroup Rhabdomyosarcoma Study Group Clinical Classification System for Rhabdomyosarcoma [8]

Clinical Group	Extent of Disease, Resectability, and Margin Status
I	A: localized tumor, confined to site of origin, completely resected
	B: localized tumor, infiltrating beyond site of origin, completely resected
II	A: localized tumor, gross total resection, but with microscopic residual disease
	B: locally extensive tumor (spread to regional lymph nodes), completely resected
III	A: localized or locally extensive tumor, gross residual disease after biopsy only
	B: localized or locally extensive tumor, gross residual disease after major resection (≥ 50% debulking)
IV	Any size primary tumor, with or without regional lymph node involvement, with distant metastases, irrespective of surgical approach to primary tumor