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  • Title: Cross Lineage Rearrangement in Feline Enteropathy-Associated T-cell Lymphoma.
    Author: Andrews C, Operacz M, Maes R, Kiupel M.
    Journal: Vet Pathol; 2016 May; 53(3):559-62. PubMed ID: 26215761.
    Abstract:
    Feline enteropathy-associated T-cell lymphoma (EATL) type II is characterized by infiltration of the small intestinal mucosa with small T-cells with variable epitheliotropism and is often difficult to differentiate from inflammation. Polymerase chain reaction (PCR) to assess antigen receptor rearrangements (PARR) amplifies the T- (T-cell receptor gamma, TCRG) or B-cell (immunoglobulin heavy chain, IGH) antigen receptor genes and is used to differentiate EATL from inflammation. However, PARR does not determine lymphocyte phenotype, and clonal rearrangement of either or both the TCRG or IGH genes may be detected in neoplastic T-cells. The purpose of this study was to determine the incidence of cross lineage rearrangement in feline EATL type II. Using a diagnostic algorithm combining histology, immunohistochemistry, and PARR testing, 8 of 92 cases diagnosed as EATL type II at Michigan State University between January 2013 and June 2014 showed cross lineage rearrangement (8.7%). PARR for the IGH gene facilitates the diagnosis of cases histologically highly suggestive of EATL type II in which polyclonal rearrangement of the TCRG gene is detected.
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