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Vijayasekharan K, Chatterjee G, Ramanathan S, Narula G, Tembhare P, Subramanian PG, Patkar N, Gujral S, Shetty D, Banavali S. Sudden blast phase in pediatric chronic myeloid leukemia-chronic phase with abnormal lymphoid blasts detected by flow cytometry at diagnosis: Can it be considered a warning sign? Cytometry B Clin Cytom 2020; 100:345-351. [PMID: 33030302 DOI: 10.1002/cyto.b.21958] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/15/2020] [Revised: 08/04/2020] [Accepted: 09/14/2020] [Indexed: 12/20/2022]
Abstract
BACKGROUND Inconclusive knowledge persists regarding the course of chronic myeloid leukemia-chronic phase (CML-CP) patients with detectable abnormal blasts by flow-cytometry at diagnosis. The 2016 WHO classification is not specific regarding sub-classification of CML with <10% abnormal B-lymphoid blasts (ABLB), and suggests these patients often show rapid progression. We report the clinical course of pediatric CML-CP patients who had detectable abnormal blasts by flow-cytometry at baseline. METHODS Retrospective audit of all pediatric CML patients between January 2013 and December 2017 were included. Their clinical presentation, demographic profile, and treatment outcomes were extracted from electronic medical records. Some of these patients got flow-cytometry done by default, though it was not a routine part of diagnostic CML marrow studies. RESULTS Amongst 65 pediatric CML patients, flow-cytometry at initial diagnosis was available in 15 (CP-12; AP-3). Of the 12 CML-CP patients, 10 (83%) had abnormal flow-cytometric findings-5 (50%) with mixed lineage blasts (4-B/Myeloid, 1-B/T/Myeloid), and myeloid lineage blasts in the remaining 5 (50%). At a median follow-up of 26 months (range: 9-34 months), 3/5 patients with ABLB at diagnosis progressed to frank blast crisis (2 B-cell; 1 Mixed lineage). None among the five patients with diagnostic myeloid-alone aberrant blasts progressed to blast crisis. Imatinib resistant mutation was also found in 3/5 (60%) CML-CP patients with these ABLB at baseline. CONCLUSIONS Although a retrospective study with limited sample size, presence of ABLB detected on flow-cytometry in CML-CP patients, had a noticeable early conversion to CML-BC in our cohort. Incorporation of flow-cytometry in diagnostic work-up can provide useful insight regarding the behavior of pediatric CML-CP patients and guide therapy.
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Affiliation(s)
- Kalasekhar Vijayasekharan
- Department of Medical Oncology, Tata Memorial Center, Mumbai, Maharashtra, India.,Homi Bhabha National Institute, Mumbai, Maharashtra, India.,Division of Pediatric Hematology and Oncology, Kasturba Medical College, Manipal Academy of Higher Education (MAHE), Manipal, Karnataka, India
| | - Gaurav Chatterjee
- Homi Bhabha National Institute, Mumbai, Maharashtra, India.,Hematopathology Laboratory, Tata Memorial Center - ACTREC, Mumbai, Maharashtra, India
| | - Subramaniam Ramanathan
- Department of Medical Oncology, Tata Memorial Center, Mumbai, Maharashtra, India.,Homi Bhabha National Institute, Mumbai, Maharashtra, India
| | - Gaurav Narula
- Department of Medical Oncology, Tata Memorial Center, Mumbai, Maharashtra, India.,Homi Bhabha National Institute, Mumbai, Maharashtra, India
| | - Prashant Tembhare
- Homi Bhabha National Institute, Mumbai, Maharashtra, India.,Hematopathology Laboratory, Tata Memorial Center - ACTREC, Mumbai, Maharashtra, India
| | - Papagudi G Subramanian
- Homi Bhabha National Institute, Mumbai, Maharashtra, India.,Hematopathology Laboratory, Tata Memorial Center - ACTREC, Mumbai, Maharashtra, India
| | - Nikhil Patkar
- Homi Bhabha National Institute, Mumbai, Maharashtra, India.,Hematopathology Laboratory, Tata Memorial Center - ACTREC, Mumbai, Maharashtra, India
| | - Sumeet Gujral
- Homi Bhabha National Institute, Mumbai, Maharashtra, India.,Hematopathology Laboratory, Tata Memorial Center - ACTREC, Mumbai, Maharashtra, India
| | - Dhanlaxmi Shetty
- Homi Bhabha National Institute, Mumbai, Maharashtra, India.,Hematopathology Laboratory, Tata Memorial Center - ACTREC, Mumbai, Maharashtra, India
| | - Shripad Banavali
- Department of Medical Oncology, Tata Memorial Center, Mumbai, Maharashtra, India.,Homi Bhabha National Institute, Mumbai, Maharashtra, India
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