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Shetty D, Talker E, Jain H, Talker J, Patkar N, Subramanian P, Jain H, Bonda A, Punatar S, Gokarn A, Bagal B, Sengar M, Khattry N. Evaluation of cytogenetic response in CML patients with variant Philadelphia translocation. Asia Pac J Clin Oncol 2021; 18:99-108. [PMID: 33629824 DOI: 10.1111/ajco.13522] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2020] [Accepted: 11/01/2020] [Indexed: 11/29/2022]
Abstract
BACKGROUND AND AIM Molecular mechanism of translocation and outcome in variant chronic myeloid leukaemia (vCML) has been a topic of debate. While several cytogenetic studies suggest a low response to Imatinib Mesylate, others demonstrate a similar disease course in both classical and vCML. Besides, many studies comprehensively also link tyrosine kinase domain (TKD) mutations with aggressive clinical outcome. Thus, we aim to study the molecular mechanism of translocation, identify the third partner chromosomes and comment on the disease course and clinical outcome. METHOD We cytogenetically characterised 25 vCML cases to determine the third partner chromosome, mechanism of translocation and prognostic outcome. We also compared vCML cases with and without TKD mutation to most appropriately outline the clinical consequence and ascertain the potent cause of unresponsiveness to treatment. RESULTS Third partner chromosome in variant translocation was defined by conventional and molecular cytogenetics. Although in our study most cases showed inadequate clinical response attributable to TKD mutation rather than variant translocation, we observed an inferior outcome in cases involving chromosome 5 as the third partner. CONCLUSION Thus, we conclude that characterising and reporting new cases of variant translocations, involving various different chromosomes as third partner (with different breakpoints) by cytogenetics, will lead to a better understanding of the disease. To the best of our knowledge, this kind of delineate study has not been applied to precisely comment on the prospects of cytogenetically characterised vCML.
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Affiliation(s)
- Dhanlaxmi Shetty
- Department of Cancer Cytogenetics, Advanced Centre for Treatment, Research and Education in Cancer (ACTREC), Tata Memorial Centre, Kharghar, Navi Mumbai, India
| | - Elizabeth Talker
- Department of Cancer Cytogenetics, Advanced Centre for Treatment, Research and Education in Cancer (ACTREC), Tata Memorial Centre, Kharghar, Navi Mumbai, India
| | - Hemani Jain
- Department of Cancer Cytogenetics, Advanced Centre for Treatment, Research and Education in Cancer (ACTREC), Tata Memorial Centre, Kharghar, Navi Mumbai, India
| | - Judith Talker
- Department of Cancer Cytogenetics, Advanced Centre for Treatment, Research and Education in Cancer (ACTREC), Tata Memorial Centre, Kharghar, Navi Mumbai, India
| | - Nikhil Patkar
- Hematopathology Laboratory, Advanced Centre for Treatment, Research and Education in Cancer (ACTREC), Tata Memorial Centre, Kharghar, Navi Mumbai, India.,Homi Bhabha National Institute (HBNI), Anushaktinagar, Mumbai, India
| | - Papagudi Subramanian
- Hematopathology Laboratory, Advanced Centre for Treatment, Research and Education in Cancer (ACTREC), Tata Memorial Centre, Kharghar, Navi Mumbai, India.,Homi Bhabha National Institute (HBNI), Anushaktinagar, Mumbai, India
| | - Hasmukh Jain
- Homi Bhabha National Institute (HBNI), Anushaktinagar, Mumbai, India.,Medical Oncology Department, Tata Memorial Hospital, Tata Memorial Centre, Parel, Mumbai, India
| | - Avinash Bonda
- Homi Bhabha National Institute (HBNI), Anushaktinagar, Mumbai, India.,Medical Oncology Department, Advanced Centre for Treatment, Research and Education in Cancer (ACTREC), Tata Memorial Centre, Kharghar, Navi Mumbai, India
| | - Sachin Punatar
- Homi Bhabha National Institute (HBNI), Anushaktinagar, Mumbai, India.,Medical Oncology Department, Advanced Centre for Treatment, Research and Education in Cancer (ACTREC), Tata Memorial Centre, Kharghar, Navi Mumbai, India
| | - Anant Gokarn
- Homi Bhabha National Institute (HBNI), Anushaktinagar, Mumbai, India.,Medical Oncology Department, Advanced Centre for Treatment, Research and Education in Cancer (ACTREC), Tata Memorial Centre, Kharghar, Navi Mumbai, India
| | - Bhausaheb Bagal
- Homi Bhabha National Institute (HBNI), Anushaktinagar, Mumbai, India.,Medical Oncology Department, Tata Memorial Hospital, Tata Memorial Centre, Parel, Mumbai, India
| | - Manju Sengar
- Homi Bhabha National Institute (HBNI), Anushaktinagar, Mumbai, India.,Medical Oncology Department, Tata Memorial Hospital, Tata Memorial Centre, Parel, Mumbai, India
| | - Navin Khattry
- Homi Bhabha National Institute (HBNI), Anushaktinagar, Mumbai, India.,Medical Oncology Department, Advanced Centre for Treatment, Research and Education in Cancer (ACTREC), Tata Memorial Centre, Kharghar, Navi Mumbai, India
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