SLC22A4 and hydatidiform mole: GTD has benign and malignant forms; the benign forms include partial hydatidiform moles (PHMs) and complete hydatidiform moles, whereas the malignant forms are choriocarcinoma (which can arise from hydatidiform mole, normal term pregnancy, ectopic pregnancy, or miscarriage), ETT, and PSTT11 (Figure 1 andTable 1).