Hydatidiform MoleHydatidiform Mole, InvasiveUterine NeoplasmsTrophoblastic NeoplasmsMolesChoriocarcinomaGestational Trophoblastic DiseasePregnancy Complications, NeoplasticPregnancyAbortion, MissedPlacentaAbortion, SpontaneousChorionic VilliCyclin-Dependent Kinase Inhibitor p57Mole RatsChorionic GonadotropinHydrops FetalisPregnancy-Specific beta 1-GlycoproteinsChorionic Gonadotropin, beta Subunit, HumanPregnancy Trimester, FirstAbortion, ThreatenedTrophoblastsGenomic Imprinting