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The pathological features of angioimmunoblastic T-cell lymphomas with IDH2R172 mutations

Abstract

Angioimmunoblastic T-cell lymphoma is a peripheral T-cell lymphoma derived from follicular T-helper cells. High-throughput genomic sequencing studies have shown that angioimmunoblastic T-cell lymphoma carries frequent mutations in RHOAG17V and IDH2R172 genes. The clinico-pathological features of angioimmunoblastic T-cell lymphoma cases with RHOAG17V mutations have been addressed; however, similar studies for IDH2 mutated cases are lacking. Therefore, the aim of the present study was to evaluate the pathological features of angioimmunoblastic T-cell lymphoma with IDH2 mutations. In order to identify cases with IDH2 mutations, 50 cases previously diagnosed as angioimmunoblastic T-cell lymphoma were subjected to next-generation sequencing analysis using a custom panel covering four genes frequently mutated in angioimmunoblastic T-cell lymphoma including DNMT3A, TET2, IDH2 and RHOA. All cases were analyzed for PD1, ICOS, CXCL13, CD10, BCL6, CD21, CD23 and EBER in situ hybridization. Mutational analysis recognized three groups. Group 1: IDH2R172 mutations were identified in 20 cases (40%). All cases carried RHOAG17V mutations. Group 2: RHOAG17V mutations without IDH2R172 mutation were identified in 16 cases (32%), and Group 3: 14 cases (28%) without RHOAG17V or IDH2R172 mutations. Morphologically, angioimmunoblastic T-cell lymphoma cases with IDH2R172 mutations were characterized by the presence of medium to large clear cells (p = 0.00001), and a follicular T-helper phenotype with the particular feature of strong CD10 (p = 0.0268) and CXCL13 expression (p = 0.0346). Interestingly, TET2 mutations were identified in 32 of 33 (97%) cases with IDH2R172 and/or RHOAG17V mutations whereas only 55% of angioimmunoblastic T-cell lymphoma cases wild-type for these two genes carried TET2 mutations (p = 0.0022). In contrast, DNMT3A mutations were found in 48% of the cases and were equally distributed in the three groups. In conclusion, our results support the results of gene expression profiling studies suggesting that IDH2R172 mutations define a unique subgroup within angioimmunoblastic T-cell lymphoma with strong follicular T-helper-like phenotype and characteristic morphological features.

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Acknowledgements

The authors would like to thank Claudia Hermann and Nadine Martin for their excellent technical assistance. IM is supported by a grant from the Deutsche Forschungsgemeinschaft (DFG, QU144/1–1 to LQ-M). This work was supported in part by a grant from the Leukemia and Lymphoma Society SCOR 7013-17 to PG.

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The authors declare that they have no conflict of interest.

Correspondence to Leticia Quintanilla-Martinez.

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