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Erschienen in: Pathology & Oncology Research 4/2017

13.01.2017 | Original Article

Vasculogenic Mimicry in Clinically Non-functioning Pituitary Adenomas: a Histologic Study

verfasst von: Joseph Di Michele, Fabio Rotondo, Kalman Kovacs, Luis V. Syro, George M. Yousef, Michael D. Cusimano, Antonio Di Ieva

Erschienen in: Pathology & Oncology Research | Ausgabe 4/2017

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Abstract

The term “vasculogenic mimicry” (VM) refers to the phenomenon in which vascular-like channels, which are not lined by endothelial cells, are formed in tumors. Since its discovery in 1999, it has been observed in several tumor types and is proposed to provide blood perfusion to tumors in absence of co-apted or neo-angiogenic blood vessels. Pituitary tumors are generally slow growing, benign adenomas which are less vascularized than the normal pituitary gland. To date, VM in pituitary adenomas has not been described. In this histological study, we assessed the presence of VM in a series of surgically resected clinically non-functioning pituitary adenomas (NFPAs) using CD34 and Periodic Acid-Schiff (PAS) double staining. To identify VM, slides were assessed for the presence of CD34-negative and PAS-positive channels indicating that they were not lined by endothelial cells. The histological staining pattern suggestive of VM was noted in 22/49 (44.9%) of the specimens studied. VM was observed in both recurring and non-recurring NFPAs. The incidence of VM present varied from case to case and within groups. There was no association between the presence of VM and gender, tumor size, Ki-67 index, recurrence or cavernous sinus invasion. VM was not noted in cases of non-tumorous pituitaries. Our findings suggest the existence of a complementary perfusion system in pituitary adenomas, implying potential clinical implications with respect to response to therapy and clinical course. Further research is warranted to confirm the presence of VM in pituitary adenomas to elucidate its clinical relevance in patients diagnosed with a pituitary adenoma.
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Metadaten
Titel
Vasculogenic Mimicry in Clinically Non-functioning Pituitary Adenomas: a Histologic Study
verfasst von
Joseph Di Michele
Fabio Rotondo
Kalman Kovacs
Luis V. Syro
George M. Yousef
Michael D. Cusimano
Antonio Di Ieva
Publikationsdatum
13.01.2017
Verlag
Springer Netherlands
Erschienen in
Pathology & Oncology Research / Ausgabe 4/2017
Print ISSN: 1219-4956
Elektronische ISSN: 1532-2807
DOI
https://doi.org/10.1007/s12253-017-0196-4

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