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Table 2. The International Staging System for Multiple Myeloma

Stage Criteria Median Survival (mo) 
IBeta-2-microglobulin <3.5 mg/L and albumin ≥3.5 g/dL62
IIBeta-2-microglobulin <3.5 mg/L and albumin <3.5 g/dL or beta-2-microglobulin 3.5 mg/L to <5.5 mg/L44
IIIBeta-2-microglobulin ≥5.5 mg/L29