Abstract
Translocations involving MYC are rare in chronic lymphocytic leukemia (CLL), and up to now, their prognostic significance remains unclear. We report the characteristics of 21 patients with CLL and nine patients with prolymphocytic leukemia (PLL), diagnosed in multiple centers (n = 13), which showed an MYC translocation demonstrated by fluorescence in situ hybridization. The prevalence was estimated to be <1%. Advanced age and male predominance were observed. Morphological analysis frequently revealed the presence of prolymphocytes. A typical “CLL-immunophenotype” was found in four of nine cases with PLL. Moreover, CD5 and CD23 were frequently expressed in PLL. The latter findings are atypical for PLL and may suggest transformation or progression of an underlying CLL. MYC translocations were frequently observed with concomitant adverse cytogenetic markers, such as del(11q) (n = 8/30) and/or del(17p)/monosomy 17 (n = 7/30). In addition, the presence of unbalanced translocations (n = 24 in 13/30 cases) and complex karyotype (n = 16/30) were frequent in cases with MYC translocations. Altogether, del(17p)/monosomy 17, del(11q), and/or complex karyotype were observed in 22 of 30 patients. Survival outcome was poor: the median time to treatment was only 5 months, and overall survival (OS) from clinical diagnosis and from genetic detection was 71 and 19 months, respectively. In conclusion, CLL/PLL with MYC translocations is a rare entity, which seems to be associated with adverse prognostic features and unfavorable outcome.
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Acknowledgments
The authors would like to thank the following clinicians, cytogeneticists, and clinical biologists for kindly providing clinical and cytogenetic data and material for morphological and cytogenetic assessment: G. Ameye, T. Braeckevelt, A. Delannoy, A. Janssens, F. Lacquet, J.-M. Libouton, V. Maertens, B. Maes, F. Nollet, P. Saussoy, J.-M. Scheiff, N. Straetmans, M. Van den Driessche, E. Van Den Neste, A. Van Hoof. We gratefully acknowledge H. Lemmens, M. Stul, H. Vranckx, W. De Kelver, and all laboratory technicians for excellent technical assistance. We are also indebted to A. Ferrant for critical reading of this manuscript and to R. Logist for clerical assistance.
Funding
This work was supported by Stichting tegen Kanker. N. Put is supported by Fonds voor Wetenschappelijk Onderzoek (FWO) Vlaanderen. P. Konings and Y. Moreau are supported by grants Katholieke Universiteit Leuven (KUL) Geconcerteerde Onderzoeksacties Mathematical engineering tools for Networks (GOA MaNet), KUL Center of Excellence Symbiosys–KUL Center for Computational Systems Biology (CoE EF/05/007), Belgian Science Policy Interuniversitaire Attractiepolen P6/25 (BelSPO IUAP P6/25), Agentschap voor Innovatie door Wetenschap en Technologie (IWT) Strategisch Basisonderzoek–Molecular Karyotyping (SBO-MoKA), Federale Overheidsdienst (FOD)–Cancer. P. Vandenberghe is a senior clinical investigator of FWO Vlaanderen.
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Put, N., Van Roosbroeck, K., Konings, P. et al. Chronic lymphocytic leukemia and prolymphocytic leukemia with MYC translocations: a subgroup with an aggressive disease course. Ann Hematol 91, 863–873 (2012). https://doi.org/10.1007/s00277-011-1393-y
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DOI: https://doi.org/10.1007/s00277-011-1393-y