Original from: PR Newswire
Roche (SIX: RO, ROG; OTCQX: RHHBY) announced today that the VENTANAⓇ CLDN18 (43-14A) RxDx Assay is the first U.S. Food and Drug Administration (FDA) approved immunohistochemistry (IHC) companion diagnostic for determining CLDN18 protein expression in tumours of patients with gastric or gastroesophageal junction (GEJ) adenocarcinoma. These patients now may be eligible for treatment with Astellas' targeted therapy VYLOYTM (zolbetuximab).
"Patients who are diagnosed with gastric or gastroesophageal junction cancer are often diagnosed in an advanced stage as early symptoms can be similar across several conditions," said Jill German, Head of Pathology Lab at Roche Diagnostics. "Our companion diagnostic for CLDN18 can help identify patients eligible for targeted treatment and provide them with additional therapeutic options. With the launch of this test, Roche continues to advance personalised healthcare by expanding our innovative companion diagnostic portfolio."
Current guidelines for gastric/GEJ cancer recommend using biomarkers to guide therapeutic decision making. The new VENTANA CLDN18 (43-14A) RxDx Assay can help determine CLDN18.2 status and inform clinicians about the likelihood of patients benefiting from CLDN18.2 targeted therapy. VYLOY is the first FDA-approved treatment specifically targeting HER2-negative locally advanced unresectable or metastatic gastric or GEJ cancer patients whose tumours are CLDN18.2-positive.
Gastric cancer is the fifth most common cancer and the fourth leading cause of cancer deaths worldwide. In the U.S., 62% of gastric/GEJ cancer cases are advanced when initially diagnosed, contributing to a five-year overall survival rate of only 6%. Although gastric/GEJ cancer is less prevalent in the U.S. than in other parts of the world, it is often diagnosed late as signs and symptoms are common to other conditions.
About the VENTANA CLDN18 (43-14A) RxDx Assay
The VENTANA CLDN18 (43-14A) RxDx Assay is a qualitative immunohistochemical assay intended to be used in the assessment of Claudin 18 (CLDN18) protein in gastric adenocarcinoma including gastroesophageal junction (GEJ) adenocarcinoma. The OptiView DAB IHC Detection Kit is used for staining on a BenchMark ULTRA instrument. The assay is indicated as an aid in identifying patients with gastric or GEJ adenocarcinoma who may be eligible for treatment with VYLOY® (zolbetuximab) in accordance with the approved therapeutic product labelling. The Roche test measures expression of both variants of the CLDN18 protein (18.1 and 18.2 isoforms). CLDN18.2 is the predominant variant expressed in gastric and GEJ cancers.
The approval of the VENTANA CLDN18 (43-14A) RxDx Assay is based on the results of the SPOTLIGHT and GLOW clinical studies where it was used as the enrollment assay to identify patients whose tumours were CLDN18.2 positive. CLDN18.2 positivity is defined as ¡Ý 75% of tumour cells demonstrating moderate to strong membrane CLDN18 staining as measured by the VENTANA CLDN18 (43-14A) RxDx Assay. In these studies, approximately 38% of gastric/GEJ cancer patients expressed high levels of CLDN18 and were considered CLDN18.2 positive by the VENTANA CLDN18 (43-14A) RxDx Assay. Patients who received a combination of zolbetuximab and chemotherapy experienced a 25-31% reduction in disease progression or death.
