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Wadsworth PA, Lawrence L, Suarez CJ, Saleem A, Khodadoust MS, Kim YH, Rieger KE, Fernandez-Pol S. Two cases of mycosis fungoides with large cell transformation with KMT2A rearrangements. J Hematop 2023; 16:227-234. [PMID: 38175436 DOI: 10.1007/s12308-023-00567-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2023] [Accepted: 11/13/2023] [Indexed: 01/05/2024] Open
Abstract
Cutaneous T-cell lymphomas (CTCL) are a clinically and molecularly heterogeneous class of lymphomas of the skin-homing T cell, and their genetic profiles are not fully characterized. Previously, rearrangements of the Lysine Methyltransferase 2A (KMT2A) gene have been identified as driver mutations only in acute leukemias. KMT2A plays a role in epigenetic regulation, and cancers with such rearrangements are responsive to epigenetic therapy including hypomethylating agents. Here, we report two cases of CTCL with novel genetic profiles. KMT2A rearrangements were identified in two aggressive cases of mycosis fungoides with large cell transformation. A KMT2A::DSCAML1 gene rearrangement was seen in Case 1, while a KMT2A::MAPRE1 fusion was identified in Case 2. These cases demonstrate that KMT2A rearrangements can be found in primary CTCLs rather than solely acute leukemias, illustrating the importance of correlating molecular findings with clinical and histologic features in diagnosis. Additionally, this finding suggests that the subset of CTCLs driven by aberrancy of the KMT2A pathway may be responsive to therapy with hypomethylating agents or menin inhibitors, as seen in acute leukemias.
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Affiliation(s)
- Paul A Wadsworth
- Department of Pathology, Stanford University School of Medicine, 300 Pasteur Drive, Stanford, CA, 94305, USA
| | - Lauren Lawrence
- Department of Pathology, Stanford University School of Medicine, 300 Pasteur Drive, Stanford, CA, 94305, USA
- Guardant Health, Redwood City, CA, 94063, USA
| | - Carlos J Suarez
- Department of Pathology, Stanford University School of Medicine, 300 Pasteur Drive, Stanford, CA, 94305, USA
| | - Atif Saleem
- Department of Pathology, Stanford University School of Medicine, 300 Pasteur Drive, Stanford, CA, 94305, USA
| | - Michael S Khodadoust
- Department of Medicine, Stanford University School of Medicine, Stanford, CA, 94305, USA
| | - Youn H Kim
- Department of Dermatology, Stanford University School of Medicine, Stanford, CA, 94305, USA
| | - Kerri E Rieger
- Department of Pathology, Stanford University School of Medicine, 300 Pasteur Drive, Stanford, CA, 94305, USA
- Department of Dermatology, Stanford University School of Medicine, Stanford, CA, 94305, USA
| | - Sebastian Fernandez-Pol
- Department of Pathology, Stanford University School of Medicine, 300 Pasteur Drive, Stanford, CA, 94305, USA.
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Fei F, Stehr H, Zehnder JL. Genomic landscape of T-large granular lymphocyte leukemia and chronic lymphoproliferative disorder of NK cells: a single institution experience. Leuk Lymphoma 2023; 64:1536-1544. [PMID: 37330635 DOI: 10.1080/10428194.2023.2220450] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2023] [Revised: 05/19/2023] [Accepted: 05/25/2023] [Indexed: 06/19/2023]
Abstract
LGLL is a rare and chronic lymphoproliferative disorder including T-LGLL and CLPD-NK. Here, we investigated the genomic profiles of LGLL with a focus on STAT3 and STAT5B mutations in a cohort of 49 patients (41 T-LGLL, 8 CLPD-NK). Our study indicated that STAT3 was identified in 38.8% (19/49) of all patients, while STAT5B occurred in only 8.2% (4/49) of patients. We found that STAT3 mutations were associated with lower ANC in T-LGLL patients. The average number of pathogenic/likely pathogenic mutations in STAT3/STAT5B-mutated patients was significantly higher than that in WT patients (1.78 ± 1.17 vs 0.65 ± 1.36, p = 0.0032). Additionally, TET2-only mutated T-LGLL (n = 5) had a significant reduction in platelet values compared with the WT (n = 16) or STAT3-only mutated T-LGLL (n = 12) (p < 0.05). In conclusion, we compared the somatic mutational landscape between STAT3/STAT5B WT and mutated patients and correlate with their distinct clinical characteristics.
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Affiliation(s)
- Fei Fei
- Department of Pathology, Stanford University School of Medicine, Stanford, CA, USA
| | - Henning Stehr
- Department of Pathology, Stanford University School of Medicine, Stanford, CA, USA
| | - James L Zehnder
- Department of Pathology, Stanford University School of Medicine, Stanford, CA, USA
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Fei F, Kiruthiga KG, Younes S, Natkunam Y. EBV-positive nodular lymphocyte predominant Hodgkin lymphoma: a single institution experience. Hum Pathol 2022; 129:32-39. [PMID: 35987347 DOI: 10.1016/j.humpath.2022.07.024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/21/2022] [Revised: 07/16/2022] [Accepted: 07/18/2022] [Indexed: 12/14/2022]
Abstract
The objective of this study is to characterize the clinicopathologic features of Epstein-Barr virus (EBV)-positive nodular lymphocyte predominant Hodgkin lymphoma (NLPHL) at a single institution. A retrospective review of cases diagnosed with EBV-positive NLPHL was performed and the patients' demographic and pathologic features were collected by chart review. In this study, we identified 17 EBV-positive NLPHL patients whose clinicopathologic features are characterized. EBV was positive in lymphocyte predominant (LP) cells in 6 of 17 cases, whereas the remaining cases showed EBV positivity in background small cells. Immunohistochemical analysis showed that LP cells were positive for CD20 (94.1%) in most cases and positive for OCT2 (100%) in all cases with one case showing weak OCT2 expression, whereas PAX5 and CD79a were weak and/or variable in 9 of 12 and 3 of 7 cases, respectively. CD30 was positive in 7 of 17 cases with 5 cases showing only scattered positive cells. In addition, we report a patient who had a history of EBV-negative NLPHL and showed EBV-positive NLPHL at the time of recurrence. Molecular studies performed on the 2 biopsies in the patient indicated EBV infection involving the NF-kB pathway. Our study shows that EBV-positive NLPHL is rare and may be diagnostically challenging because of atypical immunophenotypic features, such as partial expression of CD30, and weak/variable PAX5 and/or CD79a expression. The overall retention of the B-cell phenotype with strong and diffuse expression of CD20 and OCT2 in LP cells supports the diagnosis of EBV-positive NLPHL.
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Affiliation(s)
- Fei Fei
- Department of Pathology, Stanford University School of Medicine, Stanford, CA 94305, USA
| | | | - Sheren Younes
- Department of Pathology, Stanford University School of Medicine, Stanford, CA 94305, USA
| | - Yasodha Natkunam
- Department of Pathology, Stanford University School of Medicine, Stanford, CA 94305, USA.
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