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Risk group stratification for rhabdomyosarcoma according to the International Rhabdomyosarcoma Study
| Risk group | Histology | Pretreatment stage | Clinical group |
| Low (subset 1) | Embryonal | 1 | I, II |
| 1 | III (orbit) | ||
| 2 | I, II | ||
| Low (subset 2) | 1 | III (non-orbit) | |
| 3 | I, II | ||
| Intermediate | Embryonal | 2, 3 | III |
| Alveolar | 1, 2, 3 | I, II, III | |
| High | Any | 4 | IV |
