First Patient Dosed in SANTANA-225 Ph 1/2 Trial of 225Ac-SSO110 in Patients with ES-SCLC or MCC

“RLTs are redefining precision oncology by enabling targeted delivery of radiation directly to tumor cells while minimizing exposure to healthy tissue,” said Germo Gericke, MD, Chief Medical Officer of Ariceum Therapeutics. “225Ac-SSO110 is the first SSTR2 antagonist RLT in clinical development, designed to deliver higher doses of alpha radiation directly to patients’ tumors while maintaining a favorable safety profile for individuals with neuroendocrine cancers, including ES-SCLC and MCC. Dosing the first patient in the SANTANA-225 trial is a significant step for our lead program and an important milestone towards addressing urgent patient needs in these aggressive cancers. We expect to report initial safety data from the SANTANA-225 trial in 2026, which may support expansion into additional neuroendocrine tumor indications and further validate the differentiated mechanism of action of 225Ac-SSO110.”

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