Immunex's TRAIL Molecule Shows Potential As Anti-Tumor Agent

SEATTLE, WA -- A preclinical study published in the journal Nature Medicine today demonstrated that TRAIL (TNF-related apoptosis-inducing ligand) suppresses tumor growth, and in some instances caused complete remission of tumors, by a direct and specific mechanism. The work described in the journal was conducted in mice by scientists at Immunex Corporation (NASDAQ:IMNX).

In the study, groups of mice were injected with tumor cells from a human breast cancer, or either of two different colon cancers. Following two weeks of daily injections with TRAIL, complete remission of all tumors was observed in a high proportion (70%-100%) of the treated mice. In contrast, the tumors of the untreated control mice grew progressively. Importantly, because of TRAIL's apparent specificity in targeting tumor cells, normal tissues showed no observable adverse effects.

"TRAIL is the first of a new generation of novel molecules that directly and selectively induce apoptosis of tumor cells and may have potential in the treatment of a wide variety of cancers," said David Lynch, Ph.D., senior staff scientist and senior author of the manuscript. "We are particularly excited by the apparent lack of toxicity shown in mouse studies with TRAIL to date."

Unlike most traditional chemotherapeutics, TRAIL is a naturally occurring immune system protein that is a member of the tumor necrosis factor (TNF) family. TRAIL binds to at least four distinct receptors found on many tumor cells and signals these cells to destroy themselves via a process known as apoptosis. Immunex scientists constructed a soluble form of TRAIL that was found to stimulate tumor cell destruction.

"We are very pleased about the results of the study and have promoted TRAIL to a high priority pre-development product," said Doug Williams, senior vice president, discovery research. "We will continue to study TRAIL as an anti-tumor agent in a variety of cancers."

In June of 1998, the U.S. Patent an

Contact: Pam Rabe
Immunex Corporation

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