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Targeting the Antibody Checkpoints to Enhance Cancer Immunotherapy-Focus on FcγRIIB
Ingrid Teige1, Linda Mårtensson1, Björn L Frendéus1
1BioInvent, Lund, Sweden.
Abstract:
Immunotherapy with therapeutic antibodies has increased survival for patients with hematologic and solid cancers. Still, a significant fraction of patients fails to respond to therapy or acquire resistance. Understanding and overcoming mechanisms of resistance to antibody drugs, and in particular those common to antibody drugs as a class, is therefore highly warranted and holds promise to improve response rates, duration of response and potentially overall survival. Activating and inhibitory Fc gamma receptors (FcγR) are known to coordinately regulate therapeutic activity of tumor direct-targeting antibodies. Similar, but also divergent, roles for FcγRs in controlling efficacy of immune modulatory antibodies e.g., checkpoint inhibitors have been indicated from mouse studies, and were recently implicated in contributing to efficacy in the human clinical setting. Here we discuss evidence and mechanisms by which Fc gamma receptors-the "antibody checkpoints"-regulate antibody-induced antitumor immunity. We further discuss how targeted blockade of the sole known inhibitory antibody checkpoint FcγRIIB may help overcome resistance and boost activity of clinically validated and emerging antibodies in cancer immunotherapy.
Insights
Fc gamma receptors (FcγR) regulate antibody immunotherapy effectiveness in cancer. Blocking the inhibitory FcγRIIB may overcome resistance and enhance anti-tumor immunity for better patient outcomes.
Area of Science:
- Immunology
- Oncology
- Pharmacology
Background:
- Therapeutic antibodies improve survival in cancer patients but resistance remains a challenge.
- Fc gamma receptors (FcγR) modulate the efficacy of antibody-based cancer therapies.
- Understanding FcγR roles is crucial for improving antibody drug responses.
Purpose of the Study:
- To discuss the mechanisms by which Fc gamma receptors regulate antibody-induced anti-tumor immunity.
- To explore how Fc gamma receptors contribute to resistance against antibody therapies.
- To evaluate the potential of blocking inhibitory FcγRIIB to enhance cancer immunotherapy.
Main Methods:
- Review of existing evidence on Fc gamma receptor function in cancer immunotherapy.
- Analysis of studies investigating FcγR roles in both direct-targeting and immune-modulatory antibodies.
- Discussion of clinical implications and potential therapeutic strategies targeting FcγR.
Main Results:
- Fc gamma receptors (FcγR) play a critical role in coordinating the therapeutic activity of antibodies.
- Both activating and inhibitory FcγRs influence the efficacy of various antibody-based treatments.
- FcγRIIB is identified as a key inhibitory checkpoint regulating anti-tumor immune responses.
Conclusions:
- Fc gamma receptors act as "antibody checkpoints" that govern the success of cancer immunotherapy.
- Targeting FcγRIIB blockade offers a promising strategy to overcome resistance to antibody drugs.
- Modulating Fc gamma receptor activity can enhance the effectiveness of existing and novel cancer immunotherapies.
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