TABLE 2.
International prognostic scoring system for Waldenström macroglobulinemia
| Factor associated with prognosis | Value | |
| Age, year | >65 | |
| Hemoglobin, g/dl | ≤11.5 | |
| Platelet count, No./mcL | ≤100 000 | |
| β2-Microglobulin, mg/L | >3 | |
| Monoclonal IgM, g/dl | >7 | |
| Risk stratum and survival | ||
|
| ||
| Risk category | Score a | Median survival, month |
| Low | 0 or 1 (except age) | 142.5 |
| Intermediate | 2 or age > 65 years | 98.6 |
| High | >2 | 43.5 |
Abbreviation: IgM, immunoglobulin M.
a
One point is assigned for each positive factor and the risk score is the sum of points.