International Neuroblastoma Risk Group Staging System

International Neuroblastoma Risk Group Staging System
L1	Localized tumor not involving vital structures as defined by the list of IDRFs and confined to one body compartment
L2	Locoregional tumor with presence of one or more IDRFs
M	Distant metastatic disease (except stage MS)
MS	Metastatic disease in children younger than 18 months with metastases confined to skin, liver, and/or bone marrow

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