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Pardanani A, Reichard K, Tefferi A. Advanced systemic mastocytosis-Revised classification, new drugs and how we treat. Br J Haematol 2024; 204:402-414. [PMID: 38054381 DOI: 10.1111/bjh.19245] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2023] [Revised: 11/19/2023] [Accepted: 11/24/2023] [Indexed: 12/07/2023]
Abstract
Mastocytosis constitutes the neoplastic proliferation of mast cells and is broadly classified into systemic mastocytosis (SM), cutaneous mastocytosis and mast cell sarcoma. SM is further partitioned into advanced (AdvSM) and non-advanced (SM-non-Adv) subcategories. AdvSM includes aggressive SM (ASM), SM with an associated haematological neoplasm (SM-AHN) and mast cell leukaemia (MCL). In 2022, two separate expert committees representing the 5th edition of the World Health Organization (WHO5) and the International Consensus (ICC) classification systems submitted revised classification criteria for SM, highlighted by the ICC-proposed incorporation of mast cell cytomorphology in the diagnostic criteria for MCL and myeloid-lineage restriction for the AHN component in SM-AHN. Recent developments in SM also include the introduction of KIT-targeting tyrosine kinase inhibitors (KITi), including midostaurin and avapritinib, both drugs have shown potent activity in reducing mast cell and mutant KIT burden and alleviating mast cell-associated organopathy and mediator symptoms; however, their overall impact on survival or superiority over pre-KITi era treatment options (e.g. cladribine) has not been studied in a controlled setting. In the current review, we provide a summary of recent changes in disease classification and an analysis of recent clinical trials and their impact on our current treatment approach in AdvSM.
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Affiliation(s)
| | - Kaaren Reichard
- Division of Hematopathology, Mayo Clinic, Rochester, Minnesota, USA
| | - Ayalew Tefferi
- Division of Hematology, Mayo Clinic, Rochester, Minnesota, USA
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Tefferi A, Pardanani A, Al-Kali A, Alkhateeb H, McCullough K, Patnaik M, Hogan WJ, Begna K, Elliott MA, Khera N, Palmer JM, Gangat N, Kelemen K, Orazi A, Chen D, Reichard KK. Mast cell cytomorphology and treatment outcome in mast cell leukemia. Am J Hematol 2024; 99:E5-E8. [PMID: 37732882 DOI: 10.1002/ajh.27105] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2023] [Accepted: 09/09/2023] [Indexed: 09/22/2023]
Affiliation(s)
- Ayalew Tefferi
- Division of Hematology, Mayo Clinic, Rochester, Minnesota, USA
| | | | - Aref Al-Kali
- Division of Hematology, Mayo Clinic, Rochester, Minnesota, USA
| | | | | | - Mrinal Patnaik
- Division of Hematology, Mayo Clinic, Rochester, Minnesota, USA
| | - William J Hogan
- Division of Hematology, Mayo Clinic, Rochester, Minnesota, USA
| | - Kebede Begna
- Division of Hematology, Mayo Clinic, Rochester, Minnesota, USA
| | | | - Nandita Khera
- Division of Hematology/Oncology, Mayo Clinic, Scottsdale, Arizona, USA
| | - Jeanne M Palmer
- Division of Hematology/Oncology, Mayo Clinic, Scottsdale, Arizona, USA
| | - Naseema Gangat
- Division of Hematology, Mayo Clinic, Rochester, Minnesota, USA
| | - Katalin Kelemen
- Division of Hematopathology, Mayo Clinic, Scottsdale, Arizona, USA
| | - Attilio Orazi
- Division of Hematopathology, Texas Tech University Health Sciences Center, El Paso, Texas, USA
| | - Dong Chen
- Division of Hematopathology, Mayo Clinic, Rochester, Minnesota, USA
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Tefferi A, Abdelmagid M, Al-Kali A, Patnaik M, Hogan WJ, Begna K, Gangat N, Orazi A, Chen D, Reichard KK, Pardanani A. Granularity in disease classification impacts survival prediction in advanced systemic mastocytosis: A single institution study of 329 informative cases. Am J Hematol 2024; 99:21-27. [PMID: 37772442 DOI: 10.1002/ajh.27113] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2023] [Accepted: 09/16/2023] [Indexed: 09/30/2023]
Abstract
The World Health Organization (WHO) classification system categorizes advanced systemic mastocytosis (SM-Adv) into aggressive SM (ASM), mast cell leukemia (MCL), and SM with associated hematological neoplasm (SM-AHN). By contrast, the International Consensus Classification (ICC) requires "immature" MC cytomorphology for the diagnosis of MCL and limits SM-AHN to myeloid neoplasms (SM-AMN). The current study includes 329 patients with SM-Adv (median age 65 years, range 18-88; males 58%): WHO subcategories SM-AHN (N = 212; 64%), ASM (N = 99; 30%), and MCL (N = 18; 6%); ICC subcategories SM-AMN (N = 190; 64%), ASM (N = 99; 33%), and MCL (N = 9; 3%); WHO-defined MCL with "mature" MC cytomorphology and SM-AHN associated with lymphoid neoplasms were operationally labeled as "MCL-mature" (N = 9) and SM-ALN (N = 22), respectively, and distinguished from ICC-defined MCL and SM-AMN. Multivariable analysis that included the Mayo alliance risk factors for survival in SM (age >60 years, anemia, thrombocytopenia, increased alkaline phosphatase) revealed more accurate survival prediction with the ICC versus WHO classification order: (i) survival was significantly worse with MCL-immature versus MCL-mature (hazard ratio [HR] 15; p < .01), (ii) prognostic distinction between MCL and SM-AHN/AMN was confirmed in the context of ICC (HR 9.3; p < .01) but not WHO classification order (p = .99), (iii) survival was similar between MCL-mature and SM-AMN (p = .18), and (iv) SM-AMN (HR 1.7; p < .01) but not SM-ALN (p = .37) was prognostically distinct from ASM. The current study provides evidence for the independent prognostic contribution of both the ICC system for SM-Adv and the Mayo alliance risk factors for survival in SM.
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Affiliation(s)
- Ayalew Tefferi
- Division of Hematology, Department of Medicine, Mayo Clinic, Rochester, Minnesota, USA
| | - Maymona Abdelmagid
- Division of Hematology, Department of Medicine, Mayo Clinic, Rochester, Minnesota, USA
| | - Aref Al-Kali
- Division of Hematology, Department of Medicine, Mayo Clinic, Rochester, Minnesota, USA
| | - Mrinal Patnaik
- Division of Hematology, Department of Medicine, Mayo Clinic, Rochester, Minnesota, USA
| | - William J Hogan
- Division of Hematology, Department of Medicine, Mayo Clinic, Rochester, Minnesota, USA
| | - Kebede Begna
- Division of Hematology, Department of Medicine, Mayo Clinic, Rochester, Minnesota, USA
| | - Naseema Gangat
- Division of Hematology, Department of Medicine, Mayo Clinic, Rochester, Minnesota, USA
| | - Attilio Orazi
- Texas Tech University Health Sciences Center, El Paso, Texas, USA
| | - Dong Chen
- Division of Hematopathology, Mayo Clinic, Rochester, Minnesota, USA
| | | | - Animesh Pardanani
- Division of Hematology, Department of Medicine, Mayo Clinic, Rochester, Minnesota, USA
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