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Gestational trophoblastic disease (GTD) is a term used for a group of pregnancy-related tumours. These tumours are rare, and they appear when cells in the womb start to proliferate uncontrollably. The cells that form gestational trophoblastic tumours are called trophoblasts and come from tissue that grows to form the placenta during pregnancy. There are several different types of GTD. Hydatidiform moles are, in most cases, benign, but may, sometimes, develop into invasive moles, or, in rare cases, into choriocarcinoma, which is likely to spread quickly, but which is very sensitive to chemotherapy, and has a very good prognosis. Gestational trophoblasts are of particular interest to cell biologists because, like cancer, these cells invade tissue (the uterus), but unlike cancer, they sometimes "know" when to stop. GTD can simulate pregnancy, because the uterus may contain fetal tissue, albeit abnormal. This tissue may grow at the same rate as a normal pregnancy, and produces chorionic gonadotropin, a hormone which is measured to monitor fetal well-being.〔Gestational trophoblastic disease: Epidemiology, clinical manifestations and diagnosis. Chiang JW, Berek JS. In: UpToDate (of Medicine ). Basow, DS (Ed). Massachusetts Medical Society, Waltham, Massachusetts, USA, and Wolters Kluwer Publishers, Amsterdam, The Netherlands. 2010.〕 While GTD overwhelmingly affects women of child-bearing age, it may rarely occur in postmenopausal women. ==Commonly used synonyms== Gestational trophoblastic disease (GTD) may also be called gestational trophoblastic tumour (GTT). Hydatidiform mole (one type of GTD) may also be called molar pregnancy. Persistent disease; persistent GTD: If there is any evidence of persistence of GTD, usually defined as persistent elevation of beta hCG (see «Diagnosis» below), the condition may also be referred to as gestational trophoblastic neoplasia (GTN). 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Gestational trophoblastic disease」の詳細全文を読む スポンサード リンク
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