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Germ Cell Tumors of the Female Genital Tract

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Pathology and Biology of Human Germ Cell Tumors

Abstract

Germ cell tumors (GCT) of the ovary and other locations in the female genital tract are analyzed from a clinicopathological viewpoint and reconsidered in the light of the latest genetic knowledge of their origin and information from new pluripotency and developmental stage markers.

Ovarian malignant primitive GCT have a well-defined phenotype. The expression of characteristic pluripotency markers in dysgerminoma is useful in the diagnosis of its various histologic variants, including artifacts. Dysgerminoma has a pure germ cell origin, in contrast to yolk sac tumors (YST), which may develop at any age from both germ and somatic cells at various stages of pluripotentiality. The histologically heterogeneous YST are reconsidered as primitive endodermal tumors applying a diagnostic immunohistochemical panel able to distinguish between extraembryonal and somatic variants.

Type II GCT of postpubertal testicular type such as embryonal carcinoma, mixed GCT, and choriocarcinomas are rare in females; they often occur associated with disorders of sex development.

Ovarian mature teratomas are the paradigm of a parthenogenetic origin (type IV), and their morphology and complications are exhaustively reviewed. Prognostically relevant histologic grading of immature are reanalyzed, taking into account the presence of immature endodermal structures and expression of pluripotency markers SALL4 and SOX2.

An emerging category of highly malignant GCT originating from somatic Müllerian tumors in older patients (endometrioid carcinomas and clear cell tumor) is considered. They probably arise from induced pluripotential tumor stem cells (type VI GCT) and often represent a diagnostic challenge. The comparative immunophenotypic expression of various pluripotency and tissue-specific proteins is a useful tool for their identification.

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Acknowledgments

The authors are grateful to the following pathologists for kindly providing the cases illustrating the following figures:

Figure 6-3B. Dr. Isabel Alvarado-Cabrero, Hospital Siglo XXI, Mexico DF, Mexico

Figure 6-6B. Dr. Carmen Tornos, Stony Brook University, NY. USA

Figure 6-6R. Dr. Silvia Chiarelli, Università degli Studi di Padova. Italy

Figure 6-6S. Dr. Harry Hollema, University of Groningen. The Netherlands

Figure 6-20A. Dr. Miguel Marin-Padilla, Geisel School of Medicine at Dartmouth, Hanover, NH, USA

Figure 6-23B. Dr. Lara Alberte, CHUVI Vigo, Spain

Figure 6-30. Dr. Baljeet Kaur. Hammersmith Hospital, London, UK

Figure6-31. Dr. Maria J Pareja.Complejo Hospitalario Universitario de Huelva, Spain

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Nogales, F.F., Schuldt, M. (2017). Germ Cell Tumors of the Female Genital Tract. In: Nogales, F., Jimenez, R. (eds) Pathology and Biology of Human Germ Cell Tumors. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-53775-6_6

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