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Ruan GJ, Zanwar S, Ravindran A, Schram S, Abeykoon JP, Hazim A, Young JR, Shah MV, Bennani NN, Jiang L, Morlote D, Rech KL, Goyal G, Go RS. Clinical characteristics, molecular aberrations, treatments, and outcomes of malignant histiocytosis. Am J Hematol 2024; 99:871-879. [PMID: 38409747 PMCID: PMC11038892 DOI: 10.1002/ajh.27263] [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: 12/22/2023] [Revised: 02/12/2024] [Accepted: 02/13/2024] [Indexed: 02/28/2024]
Abstract
Malignant histiocytosis (MH) is an extremely rare neoplasm of the macrophage-dendritic cell lineage. We report the clinical characteristics, molecular aberrations, treatments, and outcomes of patients with MH seen at two referral centers from January 2000 to May 2023. We identified 43 patients with MH, of which 26 had histiocytic sarcoma (MH-H), 9 interdigitating dendritic cell sarcoma (MH-IDC), and 8 Langerhans cell sarcoma (MH-LC). The median age at diagnosis was 61 years (range, 3-83). Thirty-three patients (77%) had multifocal disease, while 10 had unifocal involvement. Tumor specimens from 22 patients (51%) underwent targeted next generation sequencing, and 19 of 22 (86%) had at least one pathogenic mutation, including mutations in MAPK pathway genes (73%). The median overall survival (OS) among the entire cohort was 16 months (95% CI: 8-50). The outcomes of those with multifocal disease were significantly shorter than their unifocal counterpart: median OS of 10 months versus 50 months (p = .07). Patients with risk organ involvement (bone marrow, spleen, or liver) had significantly inferior outcomes. Chemotherapy and surgery were the most common first-line treatments for multifocal and unifocal disease, respectively. While the outcome for patients with multifocal disease was poor, there was a subset of patients who had durable responses to treatment. Our study highlights that MH has heterogeneous clinical presentation, frequent oncogenic mutations, and prognosis, which is strongly tied to disease extent and type of organ involvement.
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Affiliation(s)
- Gordon J Ruan
- Division of Hematology, Mayo Clinic, Rochester, Minnesota, USA
| | - Saurabh Zanwar
- Division of Hematology, Mayo Clinic, Rochester, Minnesota, USA
| | - Aishwarya Ravindran
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, Minnesota, USA
- Division of Laboratory Medicine-Hematopathology, Department of Pathology, The University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - Susan Schram
- Sawtooth Epidemiology & Infectious Diseases, Boise, Idaho, USA
| | | | - Antonious Hazim
- Division of Hematology, Mayo Clinic, Rochester, Minnesota, USA
| | - Jason R Young
- Department of Radiology, Mayo Clinic, Jacksonville, Florida, USA
| | - Mithun V Shah
- Division of Hematology, Mayo Clinic, Rochester, Minnesota, USA
| | - N Nora Bennani
- Division of Hematology, Mayo Clinic, Rochester, Minnesota, USA
| | - Liuyan Jiang
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Jacksonville, Florida, USA
| | - Diana Morlote
- Division of Laboratory Medicine-Hematopathology, Department of Pathology, The University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - Karen L Rech
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, Minnesota, USA
| | - Gaurav Goyal
- Division of Hematology, Mayo Clinic, Rochester, Minnesota, USA
- Division of Hematology-Oncology, The University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - Ronald S Go
- Division of Hematology, Mayo Clinic, Rochester, Minnesota, USA
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Nguyen LT, Pham GH, Vu PT, Yi HG. Favorable outcome of a histiocytic sarcoma patient treated with immune checkpoint inhibitor: a case report. Ann Med Surg (Lond) 2023; 85:6274-6278. [PMID: 38098600 PMCID: PMC10718375 DOI: 10.1097/ms9.0000000000001446] [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: 07/25/2023] [Accepted: 10/18/2023] [Indexed: 12/17/2023] Open
Abstract
Introduction and Importance Histiocytic sarcoma (HS) is an extremely rare malignancy in which there has been no standard treatment approach. Some preclinical studies have provided rationales for the application of immunotherapy in advanced HS. Case Presentation The authors reported a case of a 61-year-old patient with metastatic HS who had a rapid progression on ifosfamide, carboplatin, and etoposide chemotherapy. The authors performed PD-L1 testing, which showed a strong positivity in 90% of tumor cells. The patient was then treated with pembrolizumab 200 mg every 3 weeks. He refused palliative radiotherapy. A dramatic response in all sites was recorded on the PET-CT scan after three cycles. He was maintained on pembrolizumab, reaching over 30 months without disease progression. Clinical Discussion Recent molecular data suggests there could be a role of immunotherapy in HS. In our patient, the disease was refractory to chemotherapy and pembrolizumab has been given based on the strong PD-L1 expression. Response to immunotherapy has also been recorded in several cases with malignant histiocytic neoplasm. Conclusion Immunotherapy might bring sustained disease remission in PD-L1 high expression HS and further studies evaluating the role of immune checkpoint inhibitor in this disease are warranted.
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Affiliation(s)
- Long Thanh Nguyen
- Department of Medical Oncology No. 6, Vietnam National Cancer Hospital
| | | | - Phuong Thi Vu
- Department of Laboratory, Vinmec Times City International General Hospital
| | - Hyeon Gyu Yi
- Department of Oncology and Hematology
- College of Health Sciences, VinUniversity, Hanoi, Vietnam
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