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Modified WHO prognostic scoring system as adapted by FIGO.
| Risk factor | 0 | 1 | 2 | 4 |
|---|---|---|---|---|
| Age | <40 years old | >40 years old | – | – |
| Antecedent Pregnancy | Mole | Abortion | Term | – |
| Interval months from pregnancy | <4 | 4–6 | 7–12 | >12 |
| Pretreatment serum hCG level | <103 | 103–104 | 104–105 | >105 |
| Largest tumor size (including uterus) | <3 cm | 3–4 cm | >5 cm | – |
| Size of metastases | Lung | Spleen, kidney | Gastrointestinal system | Liver, brain |
| Number of metastases | – | 1–4 | 5–8 | >8 |
| Previous failed chemotherapy | – | – | Single drug | 2 or more drugs |
