Abstract
Therapy-related acute leukemias (t-ALs) represent approximately 10–20% of all acute leukemias, are frequently resistant to chemotherapy, and are associated with guarded outcomes. The national comprehensive cancer network data suggest that t-AL cases are diagnosed at increasing rates in breast cancer patients treated with chemotherapeutic agents targeting topoisomerase II. Two cases of BRCA1-mutated ovarian and breast carcinoma who developed therapy-related APL and ALL, respectively, following topoisomerase II-directed therapy were characterized. Genomic characterization of therapy-related acute promyelocytic leukemia (t-APL) revealed a unique RARA intron 2 breakpoint (Chr17: 40347487) at 3′-end of RARA corroborating breakpoint clustering in t-APL following topoisomerase II inhibition. Both cases of this series harbored germline BRCA1 mutations. The germline BRCA1 mutation in patient with t-APL was detected in exon 8 (HGVS nucleotide: c.512dupT). This mutation in t-APL is extremely rare. Interestingly, t-ALL patient in this series had a BRCA1 mutation (HGVS nucleotide: c.68_69delAG; BIC designation: 187delAG) identical to a previously reported case after the treatment of same primary disease. It is unlikely that two breast cancer patients with identical BRCA1 mutation receiving topoisomerase II-targeted agents for the primary disease developed t-AL by chance. This report highlights the development of t-AL in BRAC1-mutated hereditary breast and ovarian cancer patients and warrants further studies on functional consequences of topoisomerase inhibition in this setting.
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Acknowledgement
The authors are grateful to Professor Richard Larson (University of Chicago) for critical reading of the manuscript. SKH was supported by a grant from ICMR, New Delhi (Ref # 56/7/2019_HAE-BMS).
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BB, RK, and SKH conducted experiments, data acquisition, and data analyses. TG, VT, AB, and NP contributed to patients’ samples, processing and real-time PCR. DS is responsible for cytogenetics; PK and RS contributed to genetic screening of BRCA1. SG and PGS provided clinical data. SKH designed the study and wrote this paper.
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Both the patients provided written informed consent in accordance with the Declaration of Helsinki, and the Ethics Committee of Tata Memorial Centre, Mumbai (TMC-IEC III) DCGI registration number: IECIII: ECR/149/Inst/MH/2013 approved this study (IEC reference number 219/2019 dated 24/05/2019).
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Bagal, B., Kumar, R., Gaur, T. et al. Characterization of therapy-related acute leukemia in hereditary breast-ovarian carcinoma patients: role of BRCA1 mutation and topoisomerase II-directed therapy. Med Oncol 37, 48 (2020). https://doi.org/10.1007/s12032-020-01371-z
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DOI: https://doi.org/10.1007/s12032-020-01371-z