MAHOGANY: margetuximab combination in HER2+ unresectable/metastatic gastric/gastroesophageal junction adenocarcinoma

Future Oncol. 2021 Apr;17(10):1155-1164. doi: 10.2217/fon-2020-1007. Epub 2020 Dec 2.


Standard-of-care, first-line therapy for patients with advanced HER2+ gastric/gastroesophageal junction adenocarcinoma is chemotherapy plus trastuzumab, a monoclonal antibody (mAb) targeting HER2. Margetuximab is an Fc-optimized mAb that binds HER2. Retifanlimab, a humanized IgG4 mAb, binds to PD-1 and blocks its interaction with PD-L1/2. Tebotelimab, an IgG4κ bispecific DART® molecule, binds PD-1 and lymphocyte activation gene 3 concomitantly, disrupting these nonredundant inhibitory pathways to further restore exhausted T-cell function. Here, we describe the design and rationale of the randomized, open-label, Phase II/III MAHOGANY trial evaluating margetuximab plus retifanlimab with/without chemotherapy and margetuximab plus tebotelimab with chemotherapy in first-line unresectable metastatic/locally advanced gastroesophageal junction adenocarcinoma. Primary end points include objective response rate, overall survival and safety/tolerability. Clinical trial registration: NCT04082364 (

Keywords: HER2; I-O combination; LAG-3; PD-1; checkpoint inhibitor; first-line therapy; gastric cancer; gastroesophageal adenocarcinoma; gastroesophageal junction cancer; immuno-oncology.

Publication types

  • Clinical Trial, Phase II
  • Clinical Trial, Phase III
  • Randomized Controlled Trial

MeSH terms

  • Adenocarcinoma / drug therapy*
  • Adenocarcinoma / mortality
  • Adenocarcinoma / pathology*
  • Antibodies, Monoclonal / administration & dosage
  • Antineoplastic Combined Chemotherapy Protocols / therapeutic use
  • Biomarkers, Tumor
  • Esophageal Neoplasms / drug therapy*
  • Esophageal Neoplasms / mortality
  • Esophageal Neoplasms / pathology*
  • Esophagogastric Junction / pathology*
  • Female
  • Humans
  • Male
  • Neoplasm Staging
  • Receptor, ErbB-2 / metabolism
  • Stomach Neoplasms / drug therapy*
  • Stomach Neoplasms / etiology
  • Stomach Neoplasms / mortality
  • Stomach Neoplasms / pathology*
  • Treatment Outcome


  • Antibodies, Monoclonal
  • Biomarkers, Tumor
  • Receptor, ErbB-2
  • margetuximab

Supplementary concepts

  • Adenocarcinoma Of Esophagus

Associated data


Grant support