There was a significant difference in Ki-67 immunoreactivity with cytotrophoblastic cells between complete hydatidiform moles (Figure 1 a) and partial hydatidiform moles (Figure 1 b) (P < 0.001), complete hydatidiform moles and hydropic abortions (Figure 1 c) (P < 0.001) and also between hydropic abortions and partial hydatidiform moles (P = 0.002). This evidence concerns the gene MKI67 and hydatidiform mole.