Decitabine enhances cytotoxic effect of T cells with an anti-CD19 chimeric antigen receptor in treatment of lymphoma.

Abstract:

:Background: CD19-directed chimeric antigen receptor (CAR) T cells have substantial benefit in the treatment of patients with B-cell malignancies. However, despite encouraging therapeutic efficiency, there is limited overall response rate when anti-CD19 CAR-T cells are used to treat patients with relapsed and refractory (R/R) B cell lymphomas. Therefore, it further investigation is urgently needed to improve treatment efficacy. Method: A combined treatment protocol of CAR-T cell with decitabine (DAC) to treat B cell lymphoma was developed and tested on lymphoma cell lines first, and then efficacy and the underlying mechanism were investigated. After ethical approval was granted, the combined treatment protocol was applied to treat two patients with R/R B-cell lymphomas. Results: CAR-T cells were prepared successfully, and they recognized CD19 antigen expressed on lymphoma cell lines specifically. Cell-line studies also showed that CD19 antigen expression was increased by DAC pretreatment, and the function of CAR-T cells was not compromised. The cell-line study further demonstrated that lymphoma cells pretreated by DAC responded more to the treatment of CAR-T cells. Two patients with R/R B cell lymphoma were pretreated with DAC then treated with CAR-T, and both achieved complete remission (CR). Conclusions: The epigenetic modifying drug DAC increases expression of the surface antigen CD19 on lymphoma cells. The DAC pretreatment protocol may lead patients with B cell lymphoma to be more susceptible to adoptive transfer of anti-CD19 CAR-T cells treKeywordsatment.

journal_name

Onco Targets Ther

journal_title

OncoTargets and therapy

authors

Li S,Xue L,Wang M,Qiang P,Xu H,Zhang X,Kang W,You F,Xu H,Wang Y,Liu X,Yang L,Wang X

doi

10.2147/OTT.S198567

subject

Has Abstract

pub_date

2019-07-12 00:00:00

pages

5627-5638

issn

1178-6930

pii

198567

journal_volume

12

pub_type

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