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Liu R, Guo Y, Han L, Feng S, Cao J, Sun Y, Cao Z, Cui X. Somatic ARAF mutations in pediatric Langerhans cell histiocytosis: clinicopathologic, genetic and functional profiling. Clin Exp Med 2023; 23:5269-5279. [PMID: 37572153 DOI: 10.1007/s10238-023-01134-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2023] [Accepted: 06/29/2023] [Indexed: 08/14/2023]
Abstract
ARAF mutations have been identified in a limited subset of patients with Langerhans cell histiocytosis (LCH), a rare disorder characterized by abnormal proliferation of Langerhans cells. LCH is primarily instigated by mutations in the mitogen-activated protein kinase (MAPK) signaling pathway, with BRAFV600E and MAP2K1 mutations constituting most cases. ARAF mutations in LCH highlight the heterogeneity of the disease and provide insights into its underlying molecular mechanisms. However, the occurrence of ARAF-positive LCH cases is extremely rare, with only two reported globally. Although they may be linked to a more aggressive form of LCH and a more severe clinical progression, the clinical significance and functional consequences of these mutations remain uncertain. We performed next-generation sequencing (NGS) to explore driver mutations in 148 pediatric LCH patients and recognized a series of mutations, including an identical novel somatic ARAF mutation, c.1046_1051delAGGCTT (p.Q349_F351delinsL), in four pediatric LCH patients. It was considered an ARAF hotspot mutation. All reported ARAF-positive patients worldwide exhibited characteristic pathological features of LCH, albeit with involvement across multiple systems. In vitro functional studies showed that this mutation could trigger the MAPKinase pathway and phosphorylate its downstream effectors MEK1/2 and ERK1/2 (relatively weaker than BRAFV600E). Over-activation of mutant A-Raf kinase could be inhibited by the BRAF inhibitor vemurafenib. LCH is uncommon, and ARAF mutation is even rarer. In our study, we have identified a novel hotspot somatic ARAF mutation, which has been verified through functional analysis to be an activating mutation. LCH patients with ARAF mutation typically have an unfavorable prognosis due to limited treatment experiences, although they do not exhibit a high relapse rate. To aid in the development of personalized treatment approaches and prognostic markers for LCH patients, it is recommended to conduct typical pathological and immunohistochemical examinations, as well as genetic tests utilizing a targeted gene panel or whole exome sequencing (WES), for LCH diagnosis, thereby promoting the use of inhibitor treatment strategies.
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Affiliation(s)
- Rong Liu
- Department of Hematology, Capital Institute of Pediatrics, Chaoyang District, Beijing, 100020, China
| | - Yibing Guo
- GrandOmics Inc, Haidian District, Beijing, 100081, China
| | - Lin Han
- GrandOmics Inc, Haidian District, Beijing, 100081, China
| | - Shunqiao Feng
- Department of Hematology, Capital Institute of Pediatrics, Chaoyang District, Beijing, 100020, China
| | - Jing Cao
- Department of Hematology, Capital Institute of Pediatrics, Chaoyang District, Beijing, 100020, China
| | - Yanling Sun
- GrandOmics Inc, Haidian District, Beijing, 100081, China
| | - Zhenhua Cao
- GrandOmics Inc, Haidian District, Beijing, 100081, China.
| | - Xiaodai Cui
- Clinical Central Laboratory, Capital Institute of Pediatrics, Beijing, 100020, China.
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Mohapatra D, Gupta AK, Haldar P, Meena JP, Tanwar P, Seth R. Efficacy and safety of vemurafenib in Langerhans cell histiocytosis (LCH): A systematic review and meta-analysis. Pediatr Hematol Oncol 2023; 40:86-97. [PMID: 35616365 DOI: 10.1080/08880018.2022.2072986] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Almost half of the patients with Langerhans cell histiocytosis (LCH) are refractory to primary induction chemotherapy or undergo reactivation. The ideal treatment modality for refractory/relapsed LCH is yet not evidenced. This review aimed to determine the efficacy and safety of vemurafenib (a BRAF pathway inhibitor) in LCH, particularly the refractory/relapsed cases. The literature search was conducted using PubMed, Embase, CENTRAL, and abstracts published in the SIOP meetings. Studies that described the outcome of patients of LCH being treated with vemurafenib, alone or in combination, were included. A total of 416 studies were screened, and after applying exclusion criteria, 22 studies (n = 107) were included in the final analysis. The first-line therapy was prednisolone plus vinblastine for most patients (n = 92, 86%), and vemurafenib was started upfront in 3 patients (3%). The median time to first clinical response with vemurafenib was one week. The median time to best response was 5.25 months. Out of 107 patients, 62 patients (58%) had ultimately no active disease (NAD) while 39 (36%) had active disease better (ADB), making the overall response rate (ORR) of 101/107, ie, 94.4% (CI 0.88; 0.98). The main adverse effects of vemurafenib were rash or photosensitivity (47%) and other cutaneous adverse events (15%). Vemurafenib is highly efficacious and safe in the treatment of refractory LCH; however, the timing of its commencement and duration of therapy is yet to be established. Larger prospective collaborative trials are needed to answer the appropriate treatment duration and effective maintenance therapy approach.
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Affiliation(s)
- Debabrata Mohapatra
- Division of Pediatric Oncology, Department of Pediatrics, All India Institute of Medical Sciences, New Delhi, India
| | - Aditya Kumar Gupta
- Division of Pediatric Oncology, Department of Pediatrics, All India Institute of Medical Sciences, New Delhi, India
| | - Partha Haldar
- Department of Community Medicine, All India Institute of Medical Sciences, New Delhi, India
| | - Jagdish Prasad Meena
- Division of Pediatric Oncology, Department of Pediatrics, All India Institute of Medical Sciences, New Delhi, India
| | - Pranay Tanwar
- Laboratory Oncology Unit, Dr. B. R. A. Institute Rotary Cancer Hospital, All India Institute of Medical Sciences, New Delhi, India
| | - Rachna Seth
- Division of Pediatric Oncology, Department of Pediatrics, All India Institute of Medical Sciences, New Delhi, India
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Feng S, Han L, Yue M, Zhong D, Cao J, Guo Y, Sun Y, Zhang H, Cao Z, Cui X, Liu R. Frequency detection of BRAF V600E mutation in a cohort of pediatric langerhans cell histiocytosis patients by next-generation sequencing. Orphanet J Rare Dis 2021; 16:272. [PMID: 34116682 PMCID: PMC8196454 DOI: 10.1186/s13023-021-01912-3] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2021] [Accepted: 06/07/2021] [Indexed: 02/07/2023] Open
Abstract
BACKGROUND Langerhans cell histiocytosis (LCH) is a rare neoplastic disease that occurs in both children and adults, and BRAF V600E is detected in up to 64% of the patients. Several studies have discussed the associations between BRAF V600E mutation and clinicopathological manifestations, but no clear conclusions have been drawn regarding the clinical significance of the mutation in pediatric patients. RESULTS We retrieved the clinical information for 148 pediatric LCH patients and investigated the BRAF V600E mutation using next-generation sequencing alone or with droplet digital PCR. The overall positive rate of BRAF V600E was 60/148 (41%). The type of sample (peripheral blood and formalin-fixed paraffin-embedded tissue) used for testing was significantly associated with the BRAF V600E mutation status (p-value = 0.000 and 0.000). The risk of recurrence declined in patients who received targeted therapy (p-value = 0.006; hazard ratio 0.164, 95%CI: 0.046 to 0.583). However, no correlation was found between the BRAF V600E status and gender, age, stage, specific organ affected, TP53 mutation status, masses close to the lesion or recurrence. CONCLUSIONS This is the largest pediatric LCH study conducted with a Chinese population to date. BRAF V600E in LCH may occur less in East Asian populations than in other ethnic groups, regardless of age. Biopsy tissue is a more sensitive sample for BRAF mutation screening because not all of circulating DNA is tumoral. Approaches with low limit of detection or high sensitivity are recommended for mutation screening to avoid type I and II errors.
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Affiliation(s)
- Shunqiao Feng
- Department of Hematology, Children's Hospital of Capital Institute of Pediatrics, Beijing, 100020, China
| | - Lin Han
- Running Gene Inc, Beijing, China
| | - Mei Yue
- Department of Hematology, Children's Hospital of Capital Institute of Pediatrics, Beijing, 100020, China
| | - Dixiao Zhong
- Department of Hematology, Children's Hospital of Capital Institute of Pediatrics, Beijing, 100020, China
| | - Jing Cao
- Department of Hematology, Children's Hospital of Capital Institute of Pediatrics, Beijing, 100020, China
| | | | | | | | | | - Xiaodai Cui
- Department of Key Laboratory, Children's Hospital of Capital Institute of Pediatrics, Beijing, 100020, China.
| | - Rong Liu
- Department of Hematology, Children's Hospital of Capital Institute of Pediatrics, Beijing, 100020, China.
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Phan TDA, Phung BG, Duong TT, Hoang VA, Ngo DQ, Trinh NDT, Tran TT. A study of pathological characteristics and BRAF V600E status in Langerhans cell histiocytosis of Vietnamese children. J Pathol Transl Med 2021; 55:112-117. [PMID: 33494131 PMCID: PMC7987525 DOI: 10.4132/jptm.2020.11.30] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2020] [Accepted: 11/30/2020] [Indexed: 11/21/2022] Open
Abstract
Background Langerhans cell histiocytosis (LCH) is more common in children than adults and involves many organs. In children, the BRAF V600E mutation is associated with recurrent and high-risk LCH. Methods We collected paraffin blocks of 94 pediatric LCH patients to detect BRAF_V600E mutation by sequencing. The relationship between BRAF V600E status and clinicopathological parameters were also critically analyzed. Results BRAF V600E mutation exon 15 was detected in 45 cases (47.9%). Multiple systems LCH showed a significantly higher BRAF_V600E mutation rate than a single system (p=.001). No statistical significance was evident for other clinical characteristics such as age, sex, location, risk organs involvement, and CD1a expression. Conclusions In Vietnamese LCH children, the proportion of BRAF V600E mutational status was relatively high and related to multiple systems.
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Affiliation(s)
- Thu Dang Anh Phan
- Department of Pathology, University of Medicine and Pharmacy at Ho Chi Minh City, Ho Chi Minh City, Vietnam
| | - Bao Gia Phung
- Department of Pathology, City Children Hospital, Ho Chi Minh City, Vietnam
| | - Tu Thanh Duong
- Department of Pathology, University of Medicine and Pharmacy at Ho Chi Minh City, Ho Chi Minh City, Vietnam
| | - Vu Anh Hoang
- Center for Molecular Biomedicine, University of Medicine and Pharmacy at Ho Chi Minh City, Ho Chi Minh City, Vietnam
| | - Dat Quoc Ngo
- Department of Pathology, University of Medicine and Pharmacy at Ho Chi Minh City, Ho Chi Minh City, Vietnam
| | | | - Tung Thanh Tran
- Department of Pathology, Children Hospital 1, Ho Chi Minh City, Vietnam
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Kapatia G, Bhatia P, Singh M, Jain R, Bansal D, Gupta K. Multisystemic Pediatric Langerhans cell histiocytosis: a comprehensive clinico-pathological and BRAF V600E mutation study at autopsy. AUTOPSY AND CASE REPORTS 2020; 10:e2020154. [PMID: 33344274 PMCID: PMC7703466 DOI: 10.4322/acr.2020.154] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Langerhans cell histiocytosis (LCH), a disorder of antigen-presenting cells, is the commonest disorder of the mononuclear phagocytic system. Diagnosis is always challenging due to heterogeneous clinical presentation. However, with the evolution and better understanding of its biology, many of these children are being diagnosed early and offered appropriate therapy. Despite these advances, in developing countries, an early diagnosis is still challenging due to resource constraints for specialized tests. As a result, many patients succumb to their disease. Autopsy data on LCH is notably lacking in the literature. We sought to analyze the clinical (including mutational) and morphologic features at autopsy in six proven cases of LCH. This study includes a detailed clinico-pathological and mutational analysis of 6 proven cases of LCH. Presence of BRAF V600E mutation was assessed by both Real Time PCR and Sanger sequencing. A varied spectrum of organ involvement was noted with some rare and novel morphological findings, like nodular bronchiolocentric infiltration of LCH cells, lymphovascular emboli of LCH cells, and paucity of eosinophils within the infiltrate; these features have not been described earlier. Surprisingly, all cases were negative for BRAF V600E mutation on both RQ-PCR and Sanger sequencing. The present study is perhaps the first autopsy series on LCH. This extensive autopsy analysis represents a correlation of pathological features with clinical symptoms which provides clues for a timely diagnosis and appropriate therapeutic intervention. Also, our findings hint at the low frequency of BRAF V600E mutation in our LCH patients.
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Affiliation(s)
- Gargi Kapatia
- Post Graduate Institute of Medical Education & Research (PGIMER), Department of Histopathology. Chandigarh, India
| | - Prateek Bhatia
- Post Graduate Institute of Medical Education & Research (PGIMER), Department of Pediatrics. Chandigarh, India
| | - Minu Singh
- Post Graduate Institute of Medical Education & Research (PGIMER), Department of Pediatrics. Chandigarh, India
| | - Richa Jain
- Post Graduate Institute of Medical Education & Research (PGIMER), Department of Pediatrics. Chandigarh, India
| | - Deepak Bansal
- Post Graduate Institute of Medical Education & Research (PGIMER), Department of Pediatrics. Chandigarh, India
| | - Kirti Gupta
- Post Graduate Institute of Medical Education & Research (PGIMER), Department of Histopathology. Chandigarh, India
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