Ľubica Váleková, Jana Fedorová, Jana Božíková, Lukáš Plank, Peter Szépe, Tomáš Balhárek, Ján Staško, Peter Kubisz, Ján Hudeček
MALT lymphomas (Mucosa - Associated Lymphoid Tissue) are rare neoplasms that arise from a malignant transformation of mucosa lymph tissue MALT. Accounting for about 5 % of all non-Hodgkin lymphomas, more than 2/3 of them occur in gastrointestinal tract. Gastric infection of Helicobacter pylori (HP) plays an important role in its pathogenesis. To determine the diagnosis of MALT lymphoma it is essential to perform an endoscopic examination followed by the histological examination of a bioptic specimen (morphology and immunohistochemistry). Flow cytometry greatly contributes to the diagnosis and is usefull in verification of tumor population monoclonality (unimodal expression of one type of light chains, kappa or lambda) and in determination of B-cell antigen profile associated with this diagnosis (CD19+, CD20+, CD22+, CD24+, CD79a+, HLA-Dr+).