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The international staging system for myeloma [2].
| Stage | Criteria | Median survival (months) |
|---|---|---|
| I | Serum β2-microglobulin <3.5 mg/L and serum albumin ≥3.5 g/dL | 62 |
|
| ||
| II | Neither stage I or III∗ | 44 |
|
| ||
| III | Serum β2-microglobulin ≥5.5 mg/L | 29 |
*There are two categories for stage II: serum β 2-microglobulin <3.5 mg/L but serum albumin <3.5 g/dL; or serum β 2-microglobulin 3.5 to <5.5 mg/L irrespective of the serum albumin level.
