Dostarlimab in Chemoresistant Gestational Trophoblastic Neoplasia

First four cycles of Dostarlimab will be given intravenously (IV) on day 1 of each of the 21-day cycle at a dose of 500 milligrams (mg). The next 16 cycles of Dostarlimab will be given on day 1 of each of the 42-day cycles at a dose of 1,000 mg.