New emerging targets in cancer immunotherapy: the role of VISTA
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Updated: Dec 18, 2025

Paramyxoviruses for Tumor-targeted Immunomodulation: Design and Evaluation Ex Vivo
Published on: January 7, 2019
Marco Tagliamento1, Paolo Bironzo2, Silvia Novello2
1Department of Medical Oncology, Medical Oncology 2, University of Genova & IRCCS Ospedale Policlinico San Martino, Genova, Italy.
Abstract:
The immune surveillance system is complex and regulated by different actors. Programmed death protein-ligand 1 (PD-L1), the only approved biomarker in clinical practice, has proven to be imperfect in selecting patients to immune checkpoint inhibitors treatment. Therefore, new biomarkers, and new therapeutic targets, are needed to maximise the efficacy of immunotherapy. V-domain Ig Suppressor of T-cell Activation (VISTA) is a programmed death protein-1 (PD-1) homolog expressed on T cells and on antigen-presenting cells, which regulates processes of activation and repression of the immune system with not yet completely clarified mechanisms. Its blockage has demonstrated in vitro and in vivo antitumour activity. The clinical research of VISTA antagonists is ongoing. Particularly, CA-170, an orally delivered dual inhibitor of VISTA and PD-L1, has shown to have clinical efficacy in phase I and II clinical trials in different advanced solid tumour types. Further data are needed to define whether this drug class can become a new therapeutic option for patients with VISTA expressing cancers.
Insights
New immunotherapy targets like V-domain Ig Suppressor of T-cell Activation (VISTA) show promise. CA-170, a VISTA and PD-L1 inhibitor, demonstrated clinical efficacy in advanced solid tumors, suggesting a potential new treatment option.
Area of Science:
- Immunology
- Oncology
- Pharmacology
Background:
- Immune checkpoint inhibitors (ICIs) are crucial in cancer therapy, but their efficacy is limited by biomarkers like PD-L1.
- Novel therapeutic targets and biomarkers are essential to enhance immunotherapy outcomes.
- V-domain Ig Suppressor of T-cell Activation (VISTA) is a key regulator of T-cell responses with emerging antitumour potential.
Purpose of the Study:
- To explore VISTA as a therapeutic target for cancer immunotherapy.
- To evaluate the clinical efficacy and potential of VISTA antagonists, specifically CA-170.
Main Methods:
- Preclinical studies investigating VISTA blockade for antitumour activity.
- Phase I and II clinical trials of CA-170, an oral dual VISTA and PD-L1 inhibitor, in patients with advanced solid tumors.
Main Results:
- VISTA blockade demonstrated in vitro and in vivo antitumour activity.
- CA-170 exhibited clinical efficacy across various advanced solid tumor types in early-phase trials.
- The drug is an orally delivered dual inhibitor targeting both VISTA and PD-L1.
Conclusions:
- VISTA represents a promising target for novel cancer immunotherapies.
- CA-170 shows potential as a new therapeutic option for patients with VISTA-expressing cancers.
- Further clinical data are required to establish VISTA antagonists as a standard treatment modality.
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