| Stage | Grade | Size | Metastasis |
| IA | Low | < 8 cm | None |
| IB | Low | > 8 cm | None |
| IIA | High | < 8 cm | None |
| IIB | High | > 8 cm | None |
| III | Any | Any | Skip metastasis |
| IVA | Any | Any | Pulmonary metastasis |
| IVB | Any | Any | Non-pulmonary metastasis |
AJCC staging of malignant bone tumors
Experience is knowledge. Rest is information.