RT Book, Section A1 Yeomans, Edward R. A1 Hoffman, Barbara L. A1 Gilstrap III, Larry C. A1 Cunningham, F. Gary SR Print(0) ID 1138212977 T1 Gestational Trophoblastic Disease T2 Cunningham and Gilstrap's Operative Obstetrics, 3e YR 2017 FD 2017 PB McGraw-Hill Education PP New York, NY SN 9780071849067 LK obgyn.mhmedical.com/content.aspx?aid=1138212977 RD 2024/10/06 AB Gestational trophoblastic disease (GTD) refers to a spectrum of interrelated but histologically distinct tumors originating from the placenta (Table 10-1). These diseases are characterized by a reliable tumor marker, the β-subunit of human chorionic gonadotropin (β-hCG), and have varying tendencies toward local invasion and metastasis.