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International prognostic index
| Adverse risk factors |
| Age > 60 yr |
| ≥ 2 extranodal sites |
| Ann arbor stage III-IV |
| Performance status ≥ 2 (ECOG) |
| High lactate dehydrogenase |
| Risk |
| Low (n = 0-1) |
| Low-intermediate (n = 2) |
| High-intermediate (n = 3) |
| High (n = 4-5) |
