[by:www.51voa.com] [00:00.00]¸ü¶àÌýÁ¦Çë·ÃÎÊ51VOA.COM [00:01.08]Researchers are using the polio virus to fight cancer cells in the brain. [00:06.24]A team at Duke University is using a polio virus to infect tumor cells. [00:13.04]It sets off an immune response that lasts for several months. [00:18.48]The tumor goes away permanently. [00:21.44]Dr. Matthias Gromeier began clinical trials more than three years ago. [00:28.16]So far, 12 of 20 patients with a type of brain tumor [00:33.32]called glioblastoma have responded well to the treatment. [00:38.00]Gromeier said these patients had no chance of survival before the treatment. [00:44.68]He added, "If you look at them today, [00:47.84]you would not know they were cancer patients." [00:51.12]This may seem like a miracle cure. [00:54.48]But Gromeier pointed out that the approach has limits. [00:58.56]It causes a toxic reaction that can cause brain swelling. [01:04.12]This causes other side effects like muscle weakness and paralysis, [01:08.56]seizures, limb swelling and tingling, speech impairment and headaches. [01:15.04]Still, Gromeier said, "I am optimistic that we have identified the right dose [01:21.64]and the right way to use our virus [01:24.16]to get an immune response strong enough to fight the tumor, [01:27.68]but not so strong to harm the patient." [01:31.28]He called immunotherapy, "the most exciting [01:35.56]and most promising development in cancer research." [01:38.88]He said it would one day transform the way tumors are treated. [01:43.68]Glioblastomas, the most common and lethal of all brain cancers, [01:49.40]affect an estimated 240,000 people around the world per year. [01:55.68]I'm Mary Gotschall.