Gestational trophoblastic disease is a spectrum of pregnancy disorder arising from the placental trophoblastic tissues. It characterised by the secretion of a distinct tumour marker, the beta-HCG. This condition is highly curable even in the presence of metastasis. The incidence of this disease is higher in the Asian population. The major well-established risk factors for gestational trophoblastic disease are advanced maternal age and a past history of gestational trophoblastic disease. Common clinical presentations include vaginal bleeding in early trimester, uterus larger than gestational age, absence of fetal parts after 20 weeks of gestation. Ultrasonography is a reliable non-invasive tool for diagnosis of gestational trophoblastic disease in the clinical setting. All placental tissue following miscarriage or curettage should have histopathological evaluation to exclude gestational trophoblastic disease. Since this group of disorders is one of the highly curable neoplasms, early diagnosis and prompt treatment is necessary.
In Malaysia, the incidence of molar pregnancy and gestational trophoblastic neoplasia is 2.8 and 1.59 per 1000 deliveries, respectively; the disease is more common among the Chinese compared to the Malays and Indians. While uterine suction is the preferred method of uterine evacuation of hydatidiform mole, complete evacuation was not achieved at the first attempt in 25% of cases. Partial moles comprise 30% of all moles; these need follow up similar to that for complete moles as they are potentially malignant. In the management of invasive moles, chemotherapy should not be withheld in the presence of metastases or failure of regression of hCG. Placental site tumours are rare. Prophylactic hysterectomy and prophylactic chemotherapy are not recommended. However, in those patients with unsatisfactory hCG regression curves indicating 'at risk' in developing gestational trophoblastic neoplasia (GTN), 'selective preventive chemotherapy' appears appropriate. Chemotherapy remains the main modality of treatment for GTN. As tumour bulk and location of disease are important determinants in outcome, we categorized our patients into low, medium- and high-risk groups with survivals of 100, 98 and 61.7% respectively. Surgery and radiotherapy have a limited role.