Abstract
Purpose
Activation-induced cytidine deaminase (AID) is involved in somatic hypermutation and class switch recombination processes in the antibody formation. The AID activity induces gene mutations and could be associated with transformation processes of B cells. Nevertheless, the relation between AID expression and the prognosis of B cell lymphoma patients remains uncharacterized.
Methods
We examined expression levels of the AID gene in 89 lymph node specimens from lymphoma and non-lymphoma patients with Northern blot analysis and investigated an association with their survival.
Results
The AID gene was preferentially expressed in B cell lymphoma in particular in diffuse large B cell lymphoma and follicular lymphoma. We confirmed AID protein expression in the mRNA-positive but not in the negative specimens with Western blot analysis and immunohistochemical staining. Survival of the patients treated with cyclophosphamide-/doxorubicin-/vincristine-/prednisone-based chemotherapy demonstrated that the prognosis of diffuse large B cell patients was unfavorable in the mRNA-positive group compared with the negative group, and that AID expression levels were correlated with the poor prognosis. In contrast, AID expression was not linked with the prognosis of follicular lymphoma patients.
Conclusions
AID expression is a predictive marker for an unfavorable outcome in DLBCL patients treated with the chemotherapy.
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Acknowledgments
We thank Ms Kimiko Takayama, Division of Epidemiology, Chiba Cancer Center Research Institute for confirmation of patients’ survival data. The study is supported by Grants-in-Aid for Scientific Research from the Ministry of Education, Culture, Sports, Science and Technology of Japan, the Grant-in-Aid for Research on Seeds for Publicly Essential Drugs and Medical Devices from the Ministry of Health, Labor and Welfare of Japan, and a Grant-in-aid from the Nichias Corporation.
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We declare that we have no conflict of interest.
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Kawamura, K., Wada, A., Wang, JY. et al. Expression of activation-induced cytidine deaminase is associated with a poor prognosis of diffuse large B cell lymphoma patients treated with CHOP-based chemotherapy. J Cancer Res Clin Oncol 142, 27–36 (2016). https://doi.org/10.1007/s00432-015-2001-7
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DOI: https://doi.org/10.1007/s00432-015-2001-7