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Blocking IL1RAP May Strip Pancreatic Cancer of Its Defenses

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University of Miami scientists found that targeting the IL1RAP receptor weakened pancreatic tumors in lab tests. A pre-surgery clinical trial is now planned.

Scientists at the University of Miami have found a way to weaken one of pancreatic cancer's toughest defenses, and they are preparing to test it in patients. The team, based at Sylvester Comprehensive Cancer Center within the Miller School of Medicine, showed that blocking a receptor called IL1RAP dismantled much of the protective network that shields these tumors from treatment. Their findings appear in the journal JCI Insight.

The study was led by Jashodeep Datta, a surgical oncologist specializing in pancreatic and hepatobiliary cancers who co-leads the Gastrointestinal Site Disease Group at Sylvester. He and his colleagues are now moving the work toward what they describe as a first-of-its-kind neoadjuvant trial, meaning treatment given before surgery. That trial will pair an IL1RAP-targeting drug with chemoimmunotherapy in patients whose pancreatic tumors can still be removed by an operation.

Pancreatic cancer is one of the hardest cancers to treat, and much of the difficulty comes from the tissue and cells that surround the tumor. This tumor microenvironment acts as a support system, helping cancer cells adapt, keep growing and shrug off drugs. The researchers found that IL1RAP sits at the center of that system, tying together tumor cells, immune cells and fibroblasts into a coordinated defense against therapy.

"When we target IL1RAP, we are blocking a shared 'helper' receptor that many inflammatory signals rely on to transmit their message," Datta said. Because so many inflammatory signals pass through this single point, interfering with it can disrupt a wide swath of the tumor's support structure at once.

That point matters because pancreatic tumors tend to be highly inflamed while at the same time holding the immune system back. This combination of heavy inflammation and suppressed immunity is a major reason chemotherapy and immunotherapy often fall short. High levels of IL1RAP appear to help lock the tumor into that state, feeding both its growth and its resistance to treatment.

What happened in the lab

In preclinical experiments, shutting down IL1RAP reshaped the environment around the tumors in several ways. Cells that normally suppress the immune response became scarcer. T cells, the immune system's cancer-fighting agents, grew more active and worked more effectively. The tumors also built up less fibrosis, the dense scar-like tissue that walls them off, and they responded more strongly when combination treatments were added.

The strategy marks a shift in thinking. Instead of aiming only to kill cancer cells directly, it goes after the surrounding tissue that keeps them alive. By breaking down those defenses, the researchers believe existing drugs could finally reach and act on the tumor as intended.

The timing adds urgency. A newer therapy aimed at the KRAS mutation has shown it can extend survival in patients whose cancer has already spread. But adapting that approach for people with operable tumors is expected to take years. That gap leaves patients whose cancer can still be surgically removed with few new options, and Datta's team frames the IL1RAP work as a way to help fill it.

From bench to clinic

By pinpointing IL1RAP as a weak spot and linking its activity to how tumors respond to treatment, the researchers built the case for testing the idea in people. Sylvester is now advancing the neoadjuvant trial, which will deliver the IL1RAP-targeted treatment alongside chemoimmunotherapy to patients before their operations.

"Moving this work into a clinical trial is a landmark development for our GI cancer program at Sylvester," Datta said. "We're testing a clear, patient-centered strategy to disrupt IL1RAP using a treatment plan that can be delivered in the clinic."

Giving the treatment before surgery carries a practical advantage for the science. Because doctors will remove the tumor afterward, they can study the same cancer both before and after therapy, comparing the tissue to see whether blocking IL1RAP changed the environment in patients the way it did in the lab.

For now, the results come from preclinical models rather than people, and the planned trial will be the first real test of whether the approach helps patients. Still, the work offers a fresh angle on a disease that has resisted decades of effort, targeting not the cancer cell alone but the crowd of cells that protect it.

pancreatic cancer, IL1RAP, Sylvester Comprehensive Cancer Center, Jashodeep Datta, chemoimmunotherapy, neoadjuvant clinical trial, tumor microenvironment, cancer immunotherap

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