CNSide Diagnostics, LLC, a wholly-owned subsidiary of Plus Therapeutics, Inc. (Nasdaq: PSTV) ("Plus" or the "Company"), announced today that it has signed a national agreement with Elevance Health, Inc. (NYSE:ELV), effective May 1, 2026, covering approximately 45.4 million people throughout the United States, to provide the CNSide® Cerebrospinal Fluid (CSF) Tumor Cell Enumeration (TCE) assay. This brings CNSide CSF TCE assay total contracted coverage to 126 million people.

The CNSide® CSF Assay Platform supports rapid diagnoses, treatment monitoring, and treatment guidance for patients with leptomeningeal metastases. The superior clinical utility of CNSide® over standard of care has been shown in 9 peer-reviewed publications, the FORESEE clinical trial, and has been validated in the market through real-world use.