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A case of persistent gestational trophoblastic disease that developed after ectopic (cervical) pregnancy with complete hydatidiform mole (CHM) in a 56-year-old patient is presented. The diagnosis of CHM was made retrospectively based on immunohistochemical analysis of archival material using p57 and Ki67 antibodies. Observation shows the difficulty of objective diagnosis of hydatidiform mole in early pregnancy due to the lack of typical cystic transformation of the stroma of villi, focal proliferation of villous trophoblast. Application of the p57 marker fo