Abstract 2592: The role of surgery in the treatment of epithelioid trophoblastic tumor: A single institution case series

Objective: Epithelioid trophoblastic tumor (ETT) is a rare variant of gestational trophoblastic neoplasia (GTN) that develops from chorionic-type intermediate trophoblasts, simulates carcinoma, often presents many years following a pregnancy event, is associated with low or normal human chorionic gonadotropin (hCG) levels, and is relatively resistant to chemotherapy. Our aim was to identify the role of surgery in the management of both localized and metastatic ETT. Methods: A retrospective review of women with ETT treated at a gestational trophoblastic disease center from 2010-2015 identified five women. Medical records were abstracted for demographic data, clinical presentation, hCG levels, prior pregnancy information, disease sites, and treatment with chemotherapy and surgery. Results: The five women with ETT ranged in age from 28 to 48 years. Clinical presentation was abnormal uterine bleeding prompting dilation and curettage, which established the diagnosis of ETT in three women. One woman presented with repeated spontaneous pneumothorax requiring thoracoscopic resection, which identified a 6 cm ETT in the lung. Another woman was initially treated with methotrexate for a presumed ectopic pregnancy without a response. Two women had no identifiable antecedent pregnancy, two women had spontaneous abortions 19 and 72 months prior to the diagnosis of ETT, and one woman had a normal term delivery 48 months earlier. Four of five women had metastatic disease to the lungs. Three of these women underwent pulmonary wedge resection as well as hysterectomy followed by paclitaxel-cisplatin/paclitaxel-etoposide (TP/TE) chemotherapy, while the other woman was treated with etoposide, methotrexate, actinomycin D/etoposide, cisplatin (EMA/EP) chemotherapy and hysterectomy. The one woman with nonmetastatic disease was treated with hysterectomy only. All five women are currently without evidence of disease. Conclusions: Surgery, including hysterectomy and resection of metastatic disease, is an important component in the treatment of women with ETT. Adjuvant chemotherapy with a platinum-containing regimen, such as TP/TE or EMA/EP, should be used in women with metastatic disease. All five women with ETT in this series were cured using this approach, including the four with metastatic disease. Citation Format: Abigail Winder, Janelle Sobecki-Rausch, Kruti Maniar, Karen Novak, Julie Kim, John Lurain. The role of surgery in the treatment of epithelioid trophoblastic tumor: A single institution case series. [abstract]. In: Proceedings of the 107th Annual Meeting of the American Association for Cancer Research; 2016 Apr 16-20; New Orleans, LA. Philadelphia (PA): AACR; Cancer Res 2016;76(14 Suppl):Abstract nr 2592.