U.S. researchers said Monday they have identified a genetically-engineered chicken-killing virus as a promising treatment for prostate cancer in humans.

The so-called Newcastle disease virus, which harms chickens but not humans, kills prostate cancer cells of all kinds, including hormone-resistant cancer cells, according to the study published in the issue of the Journal of Virology.

"This potential treatment is available for immediate pre-clinical and clinical trials," lead author Elankumaran Subbiah said.

"We are looking for commercial entities that are interested in licensing the technology for human clinical trials and treatment. Newcastle disease virus has yet to be tested as a treatment for prostate cancer in patients."

About one in six men will develop prostate cancer. Patients typically receive hormone treatments or chemotherapy, both of which have adverse side effects. Subbiah said that the development of new treatment methodologies will not only better fight prostate cancer, but also lessen the side effects commonly associated with hormone treatments and chemotherapy.

Newcastle disease virus affects domestic and wild bird species, especially chickens, and is one of the most economically important viruses to the poultry industry. Although it can cause mild conjunctivitis and flu-like symptoms in humans who have been in close contact with infected birds, it does not pose a threat to human health.

Scientists first documented the cancer-fighting properties of Newcastle disease virus in the 1950s, but it is only with recent advances in reverse genetics technology that they have turned to the genetically engineered virus as a possible treatment.

"We modified the virus so that it replicates only in the presence of an active prostate-specific antigen and, therefore, is highly specific to prostate cancer. We also tested its efficacy in a tumor model in vitro," Subbiah said. "The recombinant virus efficiently and specifically killed prostate cancer cells, while sparing normal human cells in the laboratory, but it would take time for this to move from the discovery phase to a treatment for prostate cancer patients."

Earlier human clinical trials for other types of cancer with naturally occurring strains of Newcastle disease virus required several injections of the virus in large quantities for success. Subbiah believed that the recombinant virus would be able to eradicate prostate cancer in much lower doses.

It would also seek out metastatic prostate cancer cells and remove them.

Because it is cancer cell-type specific, "the recombinant virus will be extremely safe and can be injected intravenously or directly into the tumor," Subbiah added. Endi

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