Table 1.
GTN scoring according to risk score criteria developed by the World Health Organization (WHO) as used by FIGO. Low risk is a score < 6. High risk is a score ≥ 7 (Figo Oncology Committee, 2002).
| Prognostic Factor Score | 0 | 1 | 2 | 4 |
|---|---|---|---|---|
| Maternal age | Younger than 40 | 40 and/or older | --- | --- |
| Previous pregnancy | Hydatidiform mole | Abortion | Full-term pregnancy | --- |
| Months since last pregnancy | <4 | 4–6 | 7–12 | >12 |
| Pretreatment hCG (IU/mL) | <103 | 103-104 | >104-105 | ≥105 |
| Largest tumor size, including uterus | <3cm | 3 to < 5 cm | ≥5cm | --- |
| Site of metastases | Lung | Spleen or kidney | Gastrointestinal tract | Brain, liver |
| Number of metastases* | 0 | 1–4 | 5–8 | >8 |
| Number of drugs used to treat the tumor that have failed | 0 | 0 | 1 | ≥2 |
*
Chest X-ray is used to count number of lung metastases.