Table 3.

IRSG classification

Stage	Characteristics
I	Localized disease completely resected (regional nodes not involved)	A: Tumour confined to muscle or organ of origin
		B: Tumour infiltrating outside organ of (muscle of) origin
II	Localized or regional disease with total resection of gross tumour	A: Primary tumour grossly resected, with microscopic residual disease (negative findings in local nodes)
		B: Primary tumour and positive nodes completely resected
		C: Primary tumour and positive nodes resected, with evidence of microscopic residual disease
III	Incomplete resection of tumour or biopsy, with gross residual disease
IV	Distant metastatic disease present at diagnosis