Abstract
High rates of relapse and poor prognosis confer an urgent need for novel therapeutic agents for B cell non-Hodgkin lymphomas (B-NHLs). Herein, we describe a human IgG-like anti-CD79b/CD3 bispecific antibody (IBI38D9-L) that selectively depletes antigen-positive malignant B cells as an alternative treatment option for relapsed or refractory NHL patients. The antitumor activity and mechanism of action of IBI38D9-L were investigated in vitro using B-NHL cell lines and human primary effector cells and in vivo using xenograft models reconstituted with human PBMCs (peripheral blood mononuclear cells). Pharmacokinetic (PK) properties and preclinical toxicology were evaluated in cynomolgus monkeys and HSC-NPG mice. IBI38D9-L exerted potent B cell killing as well as T cell activation and proliferation in a tumor cell-dependent manner in vitro and was active against B-NHL cell lines with various CD79b expression levels. Subcutaneous xenograft tumors in NOG mice engrafted with human PBMCs were eradicated by IBI38D9-L treatment. Moreover, IBI38D9-L-treated mice showed a strong infiltration of activated T cells. In HSC-NPG mice, IBI38D9-L resulted in potent B cell depletion in peripheral blood and induced only slight body weight loss and cytokine release syndrome without significant toxicological findings. In cynomolgus monkeys, IBI38D9-L was well tolerated with good pharmacokinetic profiles. Collectively, these preclinical efficacy and safety data provide strong scientific rationales for using anti-CD79b/CD3 bispecific antibody as a promising therapeutic agent for B cell malignancies.
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Abbreviations
- AAALAC:
-
Association for Assessment and Accreditation of Laboratory Animal Care International
- ADC:
-
Antibody–drug conjugates
- ALL:
-
Acute lymphoblastic leukemia
- ALP:
-
Alkaline phosphatase
- ALT:
-
Alanine aminotransferase
- AST:
-
Aspartate aminotransferase
- Bite:
-
Bispecific T cell engager
- B-NHLs:
-
B cell non-Hodgkin lymphomas
- BsAbs:
-
Bispecific antibodies
- CBA:
-
Cytometric Bead Array
- CREA:
-
Creatinine
- CRS:
-
Cytokine release syndrome
- DLBCL:
-
Diffuse large B cell lymphoma
- FDA:
-
Food and Drug Administration
- IFN:
-
Interferon
- IL:
-
Interleukin
- MFI:
-
Median fluorescence intensity
- OCT:
-
Optimal cutting temperature
- PBMCs:
-
Peripheral blood mononuclear cells
- PBS:
-
Phosphate-buffered saline
- PE:
-
Phycoerythrin
- PK:
-
Pharmacokinetic
- PLT:
-
Platelet
- RBC:
-
Red blood cell
- sIg:
-
Surface Ig
- SPR:
-
Surface plasma resonance
- TGI:
-
Tumor growth inhibition
- TMDD:
-
Target-mediated drug disposition
- TNF:
-
Tumor necrosis factor
- WBC:
-
White blood cell
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Acknowledgements
We thank all scientists in the Innovent CD79b/CD3 project team.
Funding
This study was supported by Innovent Biologics and grants from Suzhou Municipal Science and Technology Bureau (Grant Number SLJ202011), Jiangsu Commission of Health (Grant Number M2020043) and Special Technical Project of Diagnosis and Treatment of Key Clinical Diseases of Suzhou (Grant Number LCZX201813).
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JW, CL and KH designed the experiments, wrote and edited the manuscript. ZK performed the in vitro T cell activation, killing and cytokine release assay. JL performed the pre-toxicology study in HSC-NPG mice. YY, MW and YL designed and performed in vivo tumor growth and ex vivo TIL analysis experiments. FH, LL, XC and MX performed the hybridoma screening and antibody selection. NL, FF and SZ performed the antibody generation and engineering. ZW performed and interpreted all protein biophysical analyses. DK and XQ designed and oversaw GLP monkey studies. BC FG and WW conceived the study, assembled and interpreted all data and edited the manuscript.
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Chen Li and Feng Guo have no potential conflicts of interest to disclose. All other authors are employees of Innovent Biologics. Innovent Biologics has filed patent applications of this work.
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All mice experiments were performed in accordance with the regulations for care and use of laboratory animals at Innovent Biologics and were approved by the Institutional Animal Care and Use Committee. All monkey experiments were approved by IACUC and performed by WestChina-Frontier PharmaTech, according to the regulations of Association for Assessment and Accreditation of Laboratory Animal Care International (AAALAC).
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Wang, J., Li, C., He, K. et al. Characterization of anti-CD79b/CD3 bispecific antibody, a potential therapy for B cell malignancies. Cancer Immunol Immunother 72, 493–507 (2023). https://doi.org/10.1007/s00262-022-03267-5
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DOI: https://doi.org/10.1007/s00262-022-03267-5