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Active, Not Recruiting

NCT Number: NCT05891171

Study of AB598 Monotherapy and Combination Therapy in Participants With Advanced Cancers

The primary purpose of this study is to assess the safety and tolerability of AB598 in participants with advanced malignancies.

Active, Not Recruiting

This study is active but is not currently recruiting participants.

Key information

Conditions

Advanced Cancer Adenocarcinoma Adnexal Diseases Advanced Malignancies Bladder Cancer Breast Diseases Breast Neoplasms Bronchial Neoplasms Carcinoma Carcinoma, Bronchogenic Carcinoma, Non-Small-Cell Lung Carcinoma, Renal Cell Carcinoma, Squamous Cell Cervical Cancer Digestive System Diseases Digestive System Neoplasms Endocrine Gland Neoplasms Endocrine System Diseases Esophageal Cancer Esophageal Diseases Esophageal Neoplasms Female Urogenital Diseases Female Urogenital Diseases and Pregnancy Complications Gastric Cancer Gastroesophageal-junction Cancer (GEJ) Gastrointestinal Diseases Gastrointestinal Neoplasms Genital Diseases Genital Diseases, Female Genital Neoplasms, Female Gonadal Disorders Head and Neck Neoplasms Head and Neck Squamous Cell Carcinoma (HNSCC) Kidney Diseases Kidney Neoplasms Lung Diseases Lung Neoplasms Male Urogenital Diseases Neoplasms Neoplasms by Histologic Type Neoplasms by Site Neoplasms, Glandular and Epithelial Non-small Cell Lung Cancer (NSCLC) Ovarian Cancer Ovarian Diseases Ovarian Neoplasms Renal Cell Carcinoma (RCC) Respiratory Tract Diseases Respiratory Tract Neoplasms Skin Diseases Skin and Connective Tissue Diseases Squamous Cell Carcinoma of Head and Neck Stomach Diseases Stomach Neoplasms Thoracic Neoplasms Triple Negative Breast Cancer (TNBC) Triple Negative Breast Neoplasms Urinary Bladder Diseases Urinary Bladder Neoplasms Urogenital Diseases Urogenital Neoplasms Urologic Diseases Urologic Neoplasms Uterine Cervical Diseases Uterine Cervical Neoplasms Uterine Diseases Uterine Neoplasms

Age range

18 year and older

Sex eligibility

All sexes

Study type

Interventional

Phase

Phase 1

Primary location

Research Site, Adelaide, Australia

Loading trial locations.

Who can participate

Healthy volunteers accepted: No

Only the study team can determine whether someone qualifies for participation.

Key Inclusion Criteria:

  • Must have at least 1 measurable lesion per Response Evaluation Criteria in Solid Tumors (RECIST) guidance
  • Eastern Cooperative Oncology Group (ECOG) performance status score of 0 or 1
  • Prior systemic radiation or whole brain radiation therapy must have been completed at least 4 weeks before investigational product (IP) administration. Other palliative radiotherapy must be completed 2 weeks before investigational product administration, if radiation therapy-related AEs have resolved to Grade ≤ 1.
  • Monotherapy-specific criteria for dose escalation and PD cohorts:
  • Dose Escalation: Participants may have any pathologically confirmed advanced or metastatic solid tumor for which standard therapy has proven ineffective, intolerable, or is considered inappropriate.
  • Pharmacodynamic Cohorts: Participants may have any pathologically confirmed advanced or metastatic solid tumors for which standard therapy has proven ineffective, intolerable, or is considered inappropriate. Participants must be able to undergo collection of a fresh frozen biopsy during screening, as well as provide an on-treatment fresh frozen biopsy.
  • Dose Expansion cohort criteria:
  • Histologically confirmed, documented diagnosis of HER2-negative locally advanced unresectable or metastatic gastric or GEJ adenocarcinoma.
  • No prior systemic treatment for locally advanced unresectable or metastatic disease.
  • Cannot have progressed within 6 months of prior platinum-based chemotherapy for earlier stage disease.

Key Exclusion Criteria:

  • Use of any live vaccines against infectious diseases (eg, influenza, varicella) within 4 weeks (28 days) of initiation of study
  • Underlying medical conditions or AEs that, in the investigator or sponsor's opinion, will make the administration of the study drugs hazardous
  • Any active or documented history of autoimmune disease including but not limited to inflammatory bowel disease, celiac disease, Wegner syndrome, Hashimoto syndrome, systemic lupus erythematosus, scleroderma, sarcoidosis, or autoimmune hepatitis, within 3 years of the first dose of study treatment
  • History of trauma or major surgery within 28 days prior to the first dose of study drug
  • Treatment with systemic immunosuppressive medication within 2 weeks prior to initiation of study treatment, or anticipation of need for systemic immunosuppressant medication during study treatment with certain protocol specified exceptions

Note: Other protocol defined Inclusion/Exclusion criteria may apply.

Treatment and study plan

AB598

Drug

Administered as specified in the treatment arm

Zimberelimab

Drug

Administered as specified in the treatment arm

Other names: AB122

Fluorouracil

Drug

Administered as specified in the treatment arm

Leucovorin

Drug

Administered as specified in the treatment arm

Oxaliplatin

Drug

Administered as specified in the treatment arm

Primary outcomes

  1. Number of Participants with Adverse Events (AEs) and Serious Adverse Events (SAEs)

    Time frame: Up to 2 years

  2. Dose Escalation Cohorts: Number of Participants with Dose-Limiting Toxicities (DLTs)

    Time frame: Up to 2 years

Secondary outcomes

  1. Area Under the Concentration-Time Curve from Administration ("0") to the Time That the Drug is No Longer Present in the Body ("infinity") (AUC 0-inf) in Whole Blood and Plasma

    Time frame: Predose, Up to 4 hours post dose

  2. Maximum Concentration (Cmax) in Whole Blood and Plasma

    Time frame: Predose, Up to 4 hours post dose

  3. Time to Maximum Concentration (Tmax) in Whole Blood and Plasma

    Time frame: Predose, Up to 4 hours post dose

  4. Number of Participants Who Test Positive for Antidrug Antibodies (ADAs) to AB598

    Time frame: Up to 2 years

  5. Objective Response Rate (ORR)

    Time frame: Up to 2 years

  6. Dose Expansion Cohort: Duration of Response (DOR)

    Time frame: Up to 2 years

Sponsors and collaborators

Lead sponsor

Arcus Biosciences, Inc.

Industry

Registry information

Official study title

A Phase 1/1b Study to Evaluate the Safety and Tolerability of AB598 Monotherapy and Combination Therapy in Participants With Advanced Malignancies

Acronym: ARC-25

Important dates

Study start
2023
Primary completion
2027
Study completion
2027
First posted
Jun 6, 2023
Registry last updated
Jul 30, 2026

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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