European Medicines Agency Accepts Astellas Marketing Authorization Application for Zolbetuximab

Astellas Pharma US, Inc today announced the European Medicines Agency (EMA) has accepted for regulatory review the company's marketing authorization application (MAA) for zolbetuximab, a first-in-class investigational Claudin 18.2 (CLDN18.2)-targeted monoclonal antibody, for first-line treatment of patients with locally advanced unresectable or metastatic HER2-negative gastric or gastroesophageal junction (GEJ) adenocarcinoma whose tumors are CLDN18.2-positive. If approved, zolbetuximab would be the first CLDN18.2-targeted therapy available in Europe for these patients. Gastric cancer accounted for 3.1% of all new cancer cases in Europe in 2020, with around 136,000 new cases diagnosed.1 The average five-year survival rate for patients with gastric cancer in Europe is 26% across all stages.2 "Patients with gastric cancer in Europe face extremely low five-year survival rates regardless of their disease stage, and innovative therapies that extend survival are needed," said Moitreyee Chatterjee-Kishore, PhD, MBA, Senior Vice President and Head of Immuno-Oncology Development, Astellas. "The EMA's acceptance of the zolbetuximab MAA continues a cascade of regulatory milestones for Astellas that are aimed at bringing a new option to patients with advanced gastric and GEJ cancer." The MAA is based on results from the Phase 3 SPOTLIGHT and GLOW clinical trials. The SPOTLIGHT study evaluated zolbetuximab plus mFOLFOX6 (a combination regimen that includes oxaliplatin, leucovorin and fluorouracil) compared to placebo plus mFOLFOX6. The GLOW study evaluated zolbetuximab plus CAPOX (a combination chemotherapy regimen that includes capecitabine and oxaliplatin) compared to placebo plus CAPOX. In both SPOTLIGHT and GLOW, approximately 38% of patients screened for the trials had tumors that were CLDN18.2-positive (?75% of tumor cells with moderate-to-strong membranous CLDN18 staining intensity), as determined by a validated immunohistochemistry assay.3,4 The anticipated recommendation by the Committee for Medicinal Products for Human Use (CHMP) of the EMA regarding the MAA and subsequent European Commission (EC) decision are expected in calendar year 2024. About Locally Advanced Unresectable or Metastatic Gastric and Gastroesophageal Junction Cancer Gastric cancer, also commonly known as stomach cancer, is the fifth most commonly diagnosed cancer worldwide.5 Gastric cancer accounted for 3.1% of all new cancer cases in Europe in 2020, with around 136,000 new cases diagnosed.1 The average five-year survival rate for patients with gastric cancer in Europe is 26% across all stages.2 Signs and symptoms can include indigestion or heartburn, pain or discomfort in the abdomen, nausea and vomiting, diarrhea or constipation, bloating of the stomach after meals, loss of appetite, and sensation of food getting stuck in the throat while eating.6 Signs of more advanced gastric cancer can include unexplained weight loss, weakness and fatigue and vomiting blood or having blood in the stool.7 Risk factors associated with gastric cancer can include older age, male gender, family history, H. pylori infection, smoking and gastroesophageal reflux disease (GERD).6,8 Because early-stage gastric cancer symptoms frequently overlap with more common stomach-related conditions, gastric cancer is often diagnosed in the advanced or metastatic stage, or once it has spread from the tumor's origin to other body tissues or organs.6 The five-year relative survival rate for patients at the metastatic stage is 6.6%.9 Gastroesophageal junction (GEJ) adenocarcinoma is a cancer that starts at the area where the esophagus joins the stomach.10 About Zolbetuximab Zolbetuximab is an investigational, first-in-class chimeric IgG1 monoclonal antibody (mAb) that targets and binds to Claudin 18.2 (CLDN18.2), a transmembrane protein. Zolbetuximab acts by binding to CLDN18.2 on the cancer cell surface of gastric epithelial cells. In pre-clinical studies, this binding interaction then induces cancer cell death by activating two distinct immune system pathways

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