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Acosta-Medina AA, Abeykoon JP, Go RS, Goyal G, Ravindran A, Schram SM, Rech KL. BRAF testing modalities in histiocytic disorders: Comparative analysis and proposed testing algorithm. Am J Clin Pathol 2023; 160:483-489. [PMID: 37458275 DOI: 10.1093/ajcp/aqad076] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2023] [Accepted: 06/01/2023] [Indexed: 11/08/2023] Open
Abstract
OBJECTIVES Understanding of histiocytic disorders has been revolutionized by demonstration of mitogen-activated protein kinase (MAPK) pathway mutations, most commonly BRAFV600E. The optimal testing strategy to assess BRAFV600E is unknown. We aimed to compare performance of testing modalities, to propose a framework for evaluation of BRAFV600E mutation status in histiocytic disorders. METHODS We retrospectively reviewed patients with histiocytic disorders and BRAF mutation testing on a lesional tissue specimen. RESULTS In 120 patients, BRAF assessment included immunohistochemistry (IHC) in 97 (80.2%), polymerase chain reaction (PCR) in 35 (28.9%), and next-generation sequencing (NGS) in 62 (51.2%). Forty-five underwent both NGS and IHC. With NGS as the gold standard, the sensitivity and specificity of IHC were 82.4% and 96.4%. Three false negatives were observed in biopsy specimens with low BRAFV600E variant allele frequency or decalcified tissue. One false-positive IHC was observed in a lung biopsy specimen, likely due to antibody cross-reactivity with respiratory cilia. Among 14 with successful NGS and PCR, a single discordance was observed. Two PCR-to-IHC discrepancies were observed, including one other false-positive IHC. CONCLUSIONS Immunohistochemistry was highly specific for detection of BRAFV600E. Main caveats were false negatives and lack of detection of non-BRAFV600E mutations. We propose the use of IHC as initial screening in general practice with reflex molecular testing if negative.
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Affiliation(s)
| | | | - Ronald S Go
- Division of Hematology, Mayo Clinic, Rochester, MN, US
| | - Gaurav Goyal
- Division of Hematology-Oncology and University of Alabama at Birmingham, Birmingham, AL, US
| | - Aishwarya Ravindran
- Division of Laboratory Medicine, University of Alabama at Birmingham, Birmingham, AL, US
| | | | - Karen L Rech
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN, US
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Acosta-Medina AA, Kemps PG, Zondag TCE, Abeykoon JP, Forma-Borst J, Steenwijk EC, Feijen EAM, Teepen JC, Bennani NN, Schram SM, Shah MV, Davidge-Pitts C, Koster MJ, Ryu JH, Vassallo R, Tobin WO, Young JR, Dasari S, Rech K, Ravindran A, Cleven AHG, Verdijk RM, van Noesel CJM, Balgobind BV, Bouma GJ, Saeed P, Bramer JAM, de Groen RAL, Vermaat JSP, van de Sande MAJ, Smit EF, Langerak AW, van Wezel T, Tonino SH, van den Bos C, van Laar JAM, Go RS, Goyal G, van Halteren AGS. BRAF V600E is associated with higher incidence of second cancers in adults with Langerhans cell histiocytosis. Blood 2023; 142:1570-1575. [PMID: 37595284 PMCID: PMC10797504 DOI: 10.1182/blood.2023021212] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2023] [Revised: 07/05/2023] [Accepted: 07/27/2023] [Indexed: 08/20/2023] Open
Abstract
In this retrospective study, BRAF mutation status did not correlate with disease extent or (event-free) survival in 156 adults with Langerhans cell histiocytosis. BRAFV600E was associated with an increased incidence of second malignancies, often comprising hematological cancers, which may be clonally related.
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Affiliation(s)
- Aldo A. Acosta-Medina
- Department of Internal Medicine, Mayo Clinic, Rochester, MN
- Division of Hematology, Mayo Clinic, Rochester, MN
| | - Paul G. Kemps
- Department of Pathology, Leiden University Medical Center, Leiden, The Netherlands
| | - Timo C. E. Zondag
- Section Clinical Immunology, Department of Internal Medicine, Erasmus University Medical Center Rotterdam, Rotterdam, The Netherlands
| | | | - Jelske Forma-Borst
- Department of Pediatrics, Leiden University Medical Center, Leiden, The Netherlands
| | - Eline C. Steenwijk
- Department of Pediatrics, Leiden University Medical Center, Leiden, The Netherlands
| | | | - Jop C. Teepen
- Princess Máxima Center for Pediatric Oncology, Utrecht, The Netherlands
| | | | | | | | | | | | - Jay H. Ryu
- Division of Pulmonary and Critical Care Medicine, Mayo Clinic, Rochester, MN
| | - Robert Vassallo
- Division of Pulmonary and Critical Care Medicine, Mayo Clinic, Rochester, MN
| | | | | | - Surendra Dasari
- Division of Biomedical Statistics and Informatics, Department of Quantitative Health Sciences, Mayo Clinic, Rochester, MN
| | - Karen Rech
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN
| | - Aishwarya Ravindran
- Department of Pathology, University of Alabama at Birmingham, Birmingham, AL
| | - Arjen H. G. Cleven
- Department of Pathology, Leiden University Medical Center, Leiden, The Netherlands
- Department of Pathology, University Medical Center Groningen, Groningen, The Netherlands
| | - Robert M. Verdijk
- Department of Pathology, Leiden University Medical Center, Leiden, The Netherlands
- Department of Pathology, Erasmus University Medical Center Rotterdam, Rotterdam, The Netherlands
| | - Carel J. M. van Noesel
- Department of Pathology, Amsterdam University Medical Centers, Amsterdam, The Netherlands
| | - Brian V. Balgobind
- Department of Radiation Oncology, Amsterdam University Medical Centers, Amsterdam, The Netherlands
| | - Gerrit Joan Bouma
- Department of Neurosurgery, Amsterdam University Medical Centers, Amsterdam, The Netherlands
| | - Peerooz Saeed
- Department of Ophthalmology, Orbital Center, Amsterdam University Medical Centers, Amsterdam, The Netherlands
| | - Jos A. M. Bramer
- Princess Máxima Center for Pediatric Oncology, Utrecht, The Netherlands
- Department of Orthopedic Surgery and Sports Medicine, Amsterdam University Medical Centers, Amsterdam, The Netherlands
| | - Ruben A. L. de Groen
- Department of Hematology, Leiden University Medical Center, Leiden, The Netherlands
| | - Joost S. P. Vermaat
- Department of Hematology, Leiden University Medical Center, Leiden, The Netherlands
| | - Michiel A. J. van de Sande
- Princess Máxima Center for Pediatric Oncology, Utrecht, The Netherlands
- Department of Orthopedic Surgery, Leiden University Medical Center, Leiden, The Netherlands
| | - Egbert F. Smit
- Department of Pulmonology, Leiden University Medical Center, Leiden, The Netherlands
| | - Anton W. Langerak
- Department of Immunology, Laboratory Medical Immunology, Erasmus University Medical Center Rotterdam, Rotterdam, The Netherlands
| | - Tom van Wezel
- Department of Pathology, Leiden University Medical Center, Leiden, The Netherlands
| | - Sanne H. Tonino
- Department of Hematology, Amsterdam University Medical Centers, Amsterdam, The Netherlands
| | - Cor van den Bos
- Princess Máxima Center for Pediatric Oncology, Utrecht, The Netherlands
- Department of Pediatric Oncology, Emma Children’s Hospital, Amsterdam University Medical Centers, Amsterdam, The Netherlands
| | - Jan A. M. van Laar
- Section Clinical Immunology, Department of Internal Medicine, Erasmus University Medical Center Rotterdam, Rotterdam, The Netherlands
- Section Clinical Immunology, Department of Immunology, Erasmus University Medical Center Rotterdam, Rotterdam, The Netherlands
| | - Ronald S. Go
- Division of Hematology, Mayo Clinic, Rochester, MN
| | - Gaurav Goyal
- Division of Hematology, Mayo Clinic, Rochester, MN
- Division of Hematology-Oncology, University of Alabama at Birmingham, Birmingham, AL
| | - Astrid G. S. van Halteren
- Department of Pathology, Leiden University Medical Center, Leiden, The Netherlands
- Section Clinical Immunology, Department of Internal Medicine, Erasmus University Medical Center Rotterdam, Rotterdam, The Netherlands
- Princess Máxima Center for Pediatric Oncology, Utrecht, The Netherlands
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Acosta-Medina AA, Abeykoon JP, Bennani NN, Davidge-Pitts C, Koster MJ, Ravindran A, Rech K, Ryu JH, Schram SM, Shah MV, Tobin WO, Vassallo R, Young JR, Go RS, Goyal G. BRAFV600E frequency and impact on outcomes in adults with langerhans cell histiocytosis. J Clin Oncol 2021. [DOI: 10.1200/jco.2021.39.15_suppl.7050] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
7050 Background: Langerhans cell histiocytosis (LCH) is an inflammatory myeloid neoplasm manifesting as unifocal, multifocal, multisystem (MS) or pulmonary LCH (smoking-related). In pediatric LCH, somatic BRAFV600E prevalence is reported at 55-70%, and associated with increased risk of multisystem disease and early treatment failure. Our aim was to describe the prevalence of BRAFV600E mutation and evaluate its association with clinical manifestations and outcomes in adults with LCH. Methods: A retrospective review of adult patients diagnosed with LCH consecutively seen at Mayo Clinic from 2011 to 2020 was performed.Evaluation of association of BRAFV600E mutational status and clinical factors was conducted by the Chi-square test for independence. Progression-free survival (PFS) and overall survival (OS) were analyzed via the Kaplan Meier method and compared with the log-rank test to assess the effect of BRAFV600E. Results: Of the total LCH cohort ( n= 128), 88 patients with available BRAFV600E results were included in the study. Median age at diagnosis was 41y (range 19 - 88); 52.3% were male. 40 (45.5%) patients had a BRAFV600E mutation. Increasing age was associated with BRAFV600E (10-year increase OR 1.42, 95%CI 1.07-1.89; p= 0.017). No correlation was observed between BRAFV600E status and site of disease, risk organ (RO: liver, spleen, marrow) involvement, or MS disease. Patients with BRAFV600E were 4 times more likely to receive targeted therapy ( BRAF inhibitor) than non- BRAFV600E patients ( p= 0.018). After a median follow up of 46 mo (95% CI 30.8-61.2), PFS was similar between BRAFV600E and non- BRAFV600E patients ( p= 0.167). However, patients with BRAFV600E had a worse 3-year OS compared with non- BRAFV600E patients (84% vs. 97.1%, p= 0.027). Patients who died had a significantly higher age at LCH diagnosis (median 62 vs. 38 years; p= 0.0002). Conclusions: In our cohort of adults with LCH, BRAFV600E was less frequent than reported in pediatric literature and was associated with worse OS. The frequency of BRAFV600E was positively correlated with increasing age. Contrary to reports in pediatric LCH, there were no significant associations between BRAFV600E and high-risk or multisystem disease.[Table: see text]
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Affiliation(s)
| | | | | | | | | | | | - Karen Rech
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN
| | - Jay H. Ryu
- Division of Pulmonary & Critical Care Medicine, Mayo Clinic, Rochester, MN
| | | | | | | | - Robert Vassallo
- Division of Pulmonary & Critical Care Medicine, Mayo Clinic, Rochester, MN
| | | | - Ronald S. Go
- Division of Hematology, Mayo Clinic, Rochester, MN
| | - Gaurav Goyal
- University of Alabama at Birmingham, Birmingham, AL
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