Abstract
Disease-specific cytogenetic abnormalities involving BCL2 gene rearrangement frequently co-exist with other cytogenetic abnormalities, contributing to disease progression in follicular lymphoma (FL). In the present study, we retrospectively investigated the prognostic impact of BCL2-unrelated cytogenetic abnormalities in FL. Of 139 consecutively diagnosed patients with FL at two independent institutes, metaphase spreads of tumor cells were obtained for use in G-banding analysis in 77 patients. The recurrent additional cytogenetic abnormalities included chromosome gains +5 (n = 8), +7 (n = 16), +12 (n = 10), and +X (n = 12), and losses −8 (n = 7), −13 (n = 12) −15 (n = 7), and 6q− (n = 7). While −15 was associated with shorter progression-free survival (PFS) in all 77 analyzed patients with evaluable G-banding results (p = 0.04), this negative impact was not evident in 42 patients treated using an R-CHOP-like regimen as first-line treatment. By contrast, 6q− was predictive for shorter PFS in patients who were initially treated with R-CHOP-like regimens without maintenance therapy (p < 0.01), while this negative impact was not evident in all 77 patients with evaluable G-banding results. These results suggest the presence of a molecular region in chromosome 6q that is responsible for the shorter PFS following R-CHOP-like chemotherapy.
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Acknowledgements
We thank Mrs. N. Inada and Mrs. T. Ikawa for their technical support. This work was supported in part by a Grant-in-Aid for Scientific Research from the Ministry of Education, Culture, Sports, Science and Technology of Japan (MEXT KAKENHI 16K09856) (MT), and by a grant from the Takeda Science Foundation (JK).
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Tsukamoto, T., Kiyota, M., Kawata, E. et al. Detection of chromosomal abnormalities by G-banding and prognostic impact in follicular lymphoma in the rituximab era. Int J Hematol 105, 658–667 (2017). https://doi.org/10.1007/s12185-016-2166-0
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DOI: https://doi.org/10.1007/s12185-016-2166-0