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Modified WHO prognostic scoring system as adapted by FIGO [30].
| Scores | 0 | 1 | 2 | 4 |
|---|---|---|---|---|
| Age | <40 | >40 | — | — |
| Antecedent pregnancy | Mole | Miscarriage | Term | — |
| Interval months from index pregnancy | <4 | 4–6 | 7–12 | >12 |
| Pretreatment serum βhCG (IU/L) | <103 | 103–104 | 104–105 | >105 |
| Largest tumour size (including uterus) (cm) | <3 | 3-4 | ≥5 | — |
| Site of metastases | Lung | Spleen/kidney | Gastrointestinal | Liver/brain |
| Number of metastases | — | 1–4 | 5–8 | >8 |
| Previous failed chemotherapy | — | — | Single drug | ≥2 drugs |
