Immunohistochemistry and molecular genetics in the differential diagnostics of mesenchymal lesions of gastrointestinal tract

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Authors: Magdaléna Daumová ^1,2; Bohuslava Vaňková ^1,2; Marián Švajdler ^1,2; Michal Michal ¹ ; Ondřej Daum ^1,2
Authors place of work: Šiklův ústav patologie LF UK a FN Plzeň ¹; Bioptická laboratoř s. r. o., Plzeň ²
Published in the journal: Čes.-slov. Patol., 56, 2020, No. 4, p. 212-220
Category: Reviews Article

Summary

Although, in routine practice, the differential diagnostics of mesenchymal tumors of the gastrointestinal tract is still focused mainly on the correct diagnosis of gastrointestinal stromal tumor and its further therapeutic management based on predictive diagnostics, recent progress in the development of endoscopic techniques has led to increased detection of other mesenchymal lesions, which were previously commonly neglected due to their small size or absence of symptoms requiring surgical exploration. Diagnosis of some of these lesions may be reached based on their histologic pattern alone, while others may be recognized with the use of tissue specific antibodies related to the probable lineage of differentiation of the neoplastic cells. Finally, a subset of tumors, commonly with uncertain lineage of differentiation, is defined by pathognomonic genetic alterations of neoplastic cells. Recognition of such alterations, based either on methods of molecular genetics or immunohistochemical detection of an altered protein product, enables a precise diagnosis in a growing number of these cases. However, regarding the fact that most of these alterations are not unique to a single tumor type, but are often shared by more neoplastic entities, the diagnosis must still be based on a complex diagnostic attitude, reflecting histological, immunohistochemical and molecular genetic features of the investigated tumor.

Keywords:

Gastrointestinal tract – digestive tract – mesenchymal tumors – differential diagnostics – immunohistochemistry – Molecular genetics

Zdroje

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