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Neuroendocrine Neoplasms of the Gynecologic Tract
Mayur Virarkar1, Sai Swarupa Vulasala1, Ajaykumar C Morani2
1Department of Diagnostic Radiology, University of Florida College of Medicine, 655 West 8th Street, C90, 2nd Floor, Clinical Center, Jacksonville, FL 32209, USA.
Abstract:
Gynecological tract neuroendocrine neoplasms (NEN) are rare, aggressive tumors from endocrine cells derived from the neuroectoderm, neural crest, and endoderm. The primary gynecologic NENs constitute 2% of gynecologic malignancies, and the cervix is the most common site of NEN in the gynecologic tract. The updated WHO classification of gynecologic NEN is based on the Ki-67 index, mitotic index, and tumor characteristics such as necrosis, and brings more uniformity in the terminology of NENs like other disease sites. Imaging plays a crucial role in the staging, triaging, restaging, and surveillance of NENs. The expression of the somatostatin receptors on the surface of neuroendocrine cells forms the basis of increasing evaluation with functional imaging modalities using traditional and new tracers, including 68Ga-DOTA-Somatostatin Analog-PET/CT. Management of NENs involves a multidisciplinary approach. New targeted therapies could improve the paradigm of care for these rare malignancies. This article focuses on the updated staging classifications, clinicopathological characteristics, imaging, and management of gynecologic NENs of the cervix, ovary, endometrium, vagina, and vulva, emphasizing the relatively common cervical neuroendocrine carcinomas among these entities.
Insights
Gynecological neuroendocrine neoplasms (NEN) are rare, aggressive tumors. This review details updated classifications, imaging, and management for these cervical, ovarian, and other gynecologic NENs.
Area of Science:
- Gynecologic Oncology
- Endocrinology
- Pathology
Background:
- Gynecological neuroendocrine neoplasms (NEN) are rare, aggressive malignancies originating from neuroendocrine cells.
- Primary gynecologic NENs account for 2% of all gynecologic cancers, with the cervix being the most frequent site.
Purpose of the Study:
- To provide an overview of the updated World Health Organization (WHO) classification for gynecologic NENs.
- To discuss the clinicopathological characteristics, imaging, and management strategies for NENs across the gynecologic tract.
- To highlight cervical neuroendocrine carcinomas as a common entity within this group.
Main Methods:
- Review of updated WHO classification criteria based on Ki-67 index, mitotic index, and tumor characteristics.
- Discussion of the role of functional imaging, including 68Ga-DOTA-Somatostatin Analog-PET/CT, in evaluating somatostatin receptor expression.
- Emphasis on a multidisciplinary approach to NEN management.
Main Results:
- The updated WHO classification enhances uniformity in NEN terminology.
- Imaging is vital for staging, treatment selection, and surveillance of gynecologic NENs.
- New targeted therapies show promise for improving patient outcomes.
Conclusions:
- Gynecologic NENs require a comprehensive understanding of updated classifications and diagnostic tools.
- Multidisciplinary management and emerging targeted therapies are crucial for improving care.
- Cervical neuroendocrine carcinomas represent a significant proportion of gynecologic NENs.
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