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Pancreatic cancer halted by virus injection in three patients

A cancer-killing virus has stopped pancreatic tumours from growing and spreading in three people in an initial safety trial, raising hopes that it may help to beat the deadly condition

By Alice Klein

29 May 2026

A scanning electron micrograph of pancreatic cancer cells

A scanning electron micrograph of pancreatic cancer cells

ANNE WESTON, EM STP, THE FRANCIS CRICK INSTITUTE/SCIENCE PHOTO LIBRARY

A virus has stopped pancreatic cancer in its tracks in three people in a clinical trial in the US. Further evaluation is needed in larger trials, but the early results are encouraging, especially since only small doses of the virus were administered for initial safety testing.

“We only injected one-tenth of the dose we are eventually aiming at, so the efficacy is better than I expected, especially as this is pancreatic cancer,” says Masato Yamamoto at the University of Minnesota, who led the development of the viral treatment.

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