ANTI-TIGIT Antibodies

ABOUT TIGIT: TIGIT is a checkpoint receptor expressed on immune cells, including T cells and NK cells. It binds CD155 on tumor cells preventing its interaction with CD226, resulting in immunosuppression.

TIGIT is co-expressed with PD-1 on tumor-infiltrating lymphocytes or NK cells and has been associated with poor prognosis in a variety of cancers.

TIGIT and PD-1 have distinct, non-redundant functions in controlling anti-tumor immune responses. Preclinical studies have shown synergistic anti-tumor activity with combined inhibition of TIGIT and PD-1.

Arcus is developing two anti-TIGIT monoclonal antibodies: domvanalimab (Fc-silent) and AB308 (Fc-enabled). Both bind to TIGIT and may enable CD155:CD226 interaction and subsequent immune cell activation.


Domvanalimab, our most advanced anti-TIGIT candidate, is an Fc-silent investigational monoclonal antibody that blocks TIGIT and has demonstrated complete receptor coverage on all TIGIT-expressing peripheral leukocytes. This investigational medicine is designed to treat solid tumors because the silent Fc domain is believed to eliminate the potential for depletion of TIGIT-bearing immune cells, which are critical for anti-tumor immune activity. Domvanalimab is currently being evaluated in an ongoing Phase 3 registrational study in combination with zimberelimab, our anti-PD-1 monoclonal antibody in first-line locally advanced or metastatic, PD-L1>50% non-small cell lung cancer.


AB308 is a second investigational anti-TIGIT monoclonal antibody that is Fc-enabled. AB308 in combination with zimberelimab is currently being investigated in a Phase 1b study of people with advanced solid and hematologic malignancies.


Unresectable, Stage III, Non-Small Cell Lung Cancer

A Phase III, randomized, double-blind, placebo-controlled, multicenter, international study of durvalumab plus domvanalimab in participants with locally advanced (Stage III), unresectable non-small cell lung cancer whose disease has not progressed following definitive platinum-based concurrent chemoradiation therapy (CRT).

Non-Small Cell Lung Cancer, PD-L1 Positive (ARC-10)

A randomized Phase 3, open-label, study to evaluate the efficacy of zimberelimab (AB122) monotherapy compared to standard chemotherapy or zimberelimab combined with domvanalimab (AB154) in front-line, PD-L1-positive locally advanced or metastatic non-small cell lung cancer.

Non-small cell lung cancer, PD-L1 positive (ARC-7)

A Phase 2 trial to evaluate the safety and efficacy of zimberelimab monotherapy, domvanalimab + zimberelimab, and domvanalimab + zimberelimab + etrumadenant in front-line non-small cell lung cancer.

Multiple Cancer Types (domvanalimab + Zimberelimab)

A Phase 1b trial to evaluate the safety, tolerability, PK, PD, and clinical activity of domvanalimab ± zimberelimab in participants with advanced solid malignancies.

Upper Gastrointestinal Tract Malignancies (ARC-21)

A phase 2 trial to evaluate the safety and efficacy of domvanalimab and zimberelimab and multiagent chemotherapy in the first-line setting, and of domvanalimab and zimberelimab in the second-line or greater setting in participants with locally advanced unresectable or metastatic esophageal, gastroesophageal junction (GEJ), and gastric adenocarcinoma.


Multiple Cancer Types (AB308 + zimberelimab; ARC-12 study)

A Phase 1/1b, multicenter, open-label, dose-escalation, and dose-expansion study to evaluate the safety, tolerability, pharmacokinetic (PK), pharmacodynamic (PD), and clinical activity of AB308 in combination with zimberelimab in participants with advanced malignancies.