for people ages 18 years and up (full criteria)
study started
estimated completion



This is a Phase 1, open-label, dose-escalation and dose-expansion study to evaluate the safety, tolerability, pharmacokinetic (PK), pharmacodynamic (PD) and clinical activity of etrumadenant (AB928) in combination with zimberelimab (AB122) (an anti-PD-1 antibody) in participants with advanced malignancies.

Official Title

A Phase 1 Study to Evaluate the Safety and Tolerability of Immunotherapy Combinations in Participants With Advanced Malignancies


In the dose-escalation phase, escalating doses of etrumadenant in combination with zimberelimab will be assessed in participants with advanced malignancies. Eligible participants will receive oral administration of etrumadenant as well as IV infusion of zimberelimab. The recommended dose for expansion (RDE) of etrumadenant will be determined upon completion of the dose-escalation phase. In the dose-expansion phase, etrumadenant at RDE in combination with zimberelimab may be assessed in participants with advanced clear-cell renal cell carcinoma (RCC) or metastatic castrate-resistant adenocarcinoma of the prostate (mCRPC). Overall duration of treatment will depend on how well the treatment is tolerated. Treatment may continue until unacceptable toxicity or progressive disease or other reasons specified in the protocol.


Non-small Cell Lung Cancer Squamous Cell Carcinoma of the Head and Neck Breast Cancer Colorectal Cancer Melanoma Bladder Cancer Ovarian Cancer Endometrial Cancer Merkel Cell Carcinoma GastroEsophageal Cancer Renal Cell Carcinoma Castration-resistant Prostate Cancer Carcinoma, Merkel Cell Carcinoma Carcinoma, Renal Cell Endometrial Neoplasms Squamous Cell Carcinoma of Head and Neck Etrumadenant Zimberelimab Dose Escalation Dose Expansion-advanced clear-cell RCC Dose Expansion-mCRPC


You can join if…

Open to people ages 18 years and up

  1. Male or female participants ≥ 18 years
  2. Must have at least 1 measurable lesion per RECIST v1.1.
  3. Eastern Cooperative Oncology Group (ECOG) performance status score of 0 or 1.
  4. Must have received standard of care, including potentially curative available therapies or interventions.
  5. Confirm that an archival tissue sample is available and ≤ 6 months old; if not, a new biopsy of a tumor lesion must be obtained. Biopsy must not put participant at undue risk and procedure must not be more invasive than a core biopsy.
  6. Adequate organ and marrow function

Dose escalation only:

  1. Pathologically confirmed non-small cell lung cancer, squamous cell carcinoma of the head and neck, renal cell carcinoma, breast cancer, colorectal cancer, melanoma, bladder cancer, ovarian cancer, endometrial cancer, Merkel cell carcinoma, or gastroesophageal cancer that is metastatic, advanced or recurrent with progression for which no alternative or curative therapy exists or standard therapy is not considered appropriate by the participant and treating physician (reason must be documented in medical records).

Dose expansion only:

  1. Patients with advanced clear-cell RCC or mCRPC.
  2. Clear-cell RCC patients may have received up to 2 prior lines of therapy, one of which must have included an anti-PD-(L)1 based therapy and must not have progressed within 16 weeks during an anti-PD-(L)1 therapy.
  3. . mCRPC patients must have progressed during or following treatment with an androgen synthesis inhibitor, and have also had one prior line of a taxane-containing regimen or the physician and participant consider the taxane-containing regimen to be inappropriate. mCRPC patients must be naive to any immunotherapy (including but not limited to anti-PD-(L)1 or anti-CTLA-4 antogonists, sipuleucel-T, etc.).

You CAN'T join if...

  1. Use of any live vaccines against infectious diseases (eg, influenza, varicella) within 4 weeks (28 days) of initiation of investigational product.
  2. Underlying medical conditions that, in the Investigator's or Sponsor's opinion, will make the administration of investigational product hazardous (eg, interstitial lung disease, active infections requiring antibiotics, recent hospitalization with unresolved symptoms) or obscure the interpretation of toxicity determination or AEs, or concurrent medical condition requiring the use of immunosuppressive medications or immunosuppressive doses of systemic or absorbable topical corticosteroids.
  3. Has known psychiatric or substance abuse disorders that would interfere with cooperation with the requirements of the trial.
  4. Is pregnant or breastfeeding or expecting to conceive or father children within the projected duration of the study, starting with the pre-screening or screening visit through 90 days after the last dose of etrumadenant in combination with zimberelimab.
  5. Any active or documented history of autoimmune disease, or history of a syndrome that required systemic steroids or immunosuppressive medications, except for vitiligo or resolved childhood asthma/atopy. Participants with asthma who require intermittent use of bronchodilators (such as albuterol) will not be excluded from this study.
  6. Prior malignancy active within the previous year except for locally curable cancers that have been apparently cured, such as basal or squamous cell skin cancer, superficial bladder cancer or carcinoma in situ of the cervix, breast, or prostate cancer.
  7. Dose escalation: Prior treatment with an anti-PD-L1, anti-PD-1, anti-CTLA-4, or other immune checkpoint inhibitor or agonist as a monotherapy or in combination;
  8. Use of other investigational drugs (drugs not marketed for any indication) within 28 days or at least 5 half-lives (whichever is longer) before investigational product administration.


  • University of California, Los Angeles
    Los Angeles California 90024 United States
  • The Angeles Clinic and Research Institute
    Los Angeles California 90025 United States


in progress, not accepting new patients
Start Date
Completion Date
Arcus Biosciences, Inc.
Phase 1
Study Type
Last Updated