Overview
Epithelioid trophoblastic tumor (ETT) is a rare form of gestational trophoblastic disease characterized by neoplastic transformation of intermediate trophoblastic cells, often resembling placental site trophoblastic tumor (PSTT) in histology. It typically arises from the placental implantation site or remnants 1.Diagnosis
Histopathological Features: Presence of intermediate trophoblastic cells with abundant rough endoplasmic reticulum and secretory characteristics 1.
Immunohistochemistry: Tumor cells often stain positive for human placental lactogen (HPL), with variable expression of beta-HCG and SP1 1.
Imaging: Ultrasound and MRI may show uterine masses or metastatic lesions 1.
Serum Markers: Elevated levels of HPL may be observed, though beta-HCG levels are usually low or undetectable 1.Management
Surgical Resection: Primary treatment often involves complete surgical excision of the tumor 1.
Chemotherapy: Used for advanced or metastatic disease; regimens may include single-agent or combination chemotherapy (e.g., dactinomycin, EMA-CO) tailored to response and extent of disease 1.
Monitoring: Regular follow-up with serum tumor markers and imaging to detect recurrence 1.Special Populations
Pregnancy: Limited data; management focuses on safe surgical intervention and monitoring for recurrence post-delivery 1.
Comorbidities: Tailored treatment plans considering patient comorbidities, often requiring multidisciplinary input 1.Key Recommendations
Confirm diagnosis through histopathological examination and immunohistochemistry, focusing on HPL expression 1. (Evidence: Moderate)
Initiate with surgical resection for localized disease, supplemented by chemotherapy for advanced cases 1. (Evidence: Moderate)
Regular monitoring post-treatment with serum markers and imaging is essential for early detection of recurrence 1. (Evidence: Moderate)References
1 Berger G, Verbaere J, Feroldi J. Placental site trophoblastic tumor of the uterus: an ultrastructural and immunohistochemical study. Ultrastructural pathology 1984. link