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



This is a Phase 2/3, randomized, open-label study for the treatment of patients with HER2-positive Gastric cancer (GC) or Gastroesophageal Junction (GEJ) cancer to determine the efficacy of margetuximab combined with INCMGA00012 (also known as MGA012) (Cohort A) and margetuximab combined with INCMGA00012 or MGD013 and chemotherapy compared to trastuzumab combined with chemotherapy (Cohort B).

Official Title

Phase 2/3 Trial to Evaluate Margetuximab in Combination With INCMGA00012 and Chemotherapy or MGD013 and Chemotherapy in Patients With Metastatic or Locally Advanced, Treatment-naïve, HER2-Positive Gastric or Gastroesophageal Junction Cancer


A single-arm cohort (Cohort A, 40 to 110 patients) will evaluate safety and efficacy of margetuximab plus INCMGA00012. In a 4-arm cohort (Cohort B Part 1, 50 patients per arm), patients will be randomized to margetuximab plus chemotherapy plus INCMGA00012, margetuximab plus chemotherapy plus MGD013, margetuximab plus chemotherapy, or trastuzumab plus chemotherapy. A checkpoint inhibitor (CPI) (INCMGA00012 or MGD013) will be selected from Cohort B Part 1 and evaluated in a randomized 2-arm cohort (Cohort B Part 2, 250 patients per arm) of margetuximab plus chemotherapy plus INCMGA00012 or MGD013, or trastuzumab plus chemotherapy.


Gastric Cancer Gastroesophageal Junction Cancer HER2-positive Gastric Cancer HER2-positive gastroesophageal cancer anti-HER2 therapy checkpoint inhibitors PD-1 LAG-3 Stomach Neoplasms Trastuzumab Antibodies, Monoclonal margetuximab plus INCMGA00012 Margetuximab plus INCMGA00012 plus chemo Margetuximab plus MGD013 plus chemo Margetuximab plus chemo Trastuzumab plus chemo


You can join if…

Open to people ages 18 years and up

  • Histologically confirmed diagnosis of previously untreated locally advanced unresectable or metastatic HER2+ GC or GEJ adenocarcinoma
  • Prior systemic perioperative treatment is allowed; however the patient must have had a disease-free interval of at least 6 months from end of chemo/surgery
  • Patients receiving perioperative anti-HER2 therapy require testing of HER2 status for eligibility
  • Cohort A: HER2-positive (by IHC 3+) and PD-L1-positive (by IHC with 22C3 CPS ≥ 1%) per central review
  • Cohort B: HER2-positive (by IHC 3+ or IHC 2+ in combination with FISH+) by local review. PD -L1 status is not required for enrollment.
  • Availability of formalin-fixed, paraffin-embedded tumor specimen, unstained slides or contemporaneous biopsy for tumor target testing
  • Eastern Cooperative Oncology Group performance status of 0 or 1, verified within 3 days of Day 1
  • Life expectancy ≥ 6 months
  • At least one radiographically measurable target lesion
  • Acceptable laboratory parameters and adequate organ function

You CAN'T join if...

  • Other malignancy that is progressing or required treatment within the past 5 years, with certain exceptions
  • Patients with known MSI-H status
  • History of allogeneic stem cell or tissue/solid organ transplant
  • Central nervous system metastases
  • Clinically significant cardiovascular disease, gastrointestinal disorders, pulmonary compromise
  • Prior neoadjuvant or adjuvant treatment with immunotherapy


  • UCLA School of Medicine not yet accepting patients
    Santa Monica California 90404 United States
  • Norris Comprehensive Cancer Center (USC) accepting new patients
    Los Angeles California 90033 United States


accepting new patients
Start Date
Completion Date
Phase 2/3
Study Type
Last Updated