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Scientist in what regulates the t cells, it is more complicated in that. there are circuits built into the t cells to keep them from hurting you. as soon as you push too hard, the off comes on to protect you and we figured out how to take the off switch off. >> joe biden talks oechb abofte moon shots to cure cancer and president trump has said as well. what role can the federal government play here? what can be done to further research and work like yours and people like you? >> the work i did stems from fundamental research trying to understand, you know, how the immune system works, how t ce...

Some hope. >> david roy was diagnosed two years ago with stage four pancreatic cancer. he was given four 1/2 moves to live. he called the doctor who he met on a plane years before. he recommended a uclaology ko-- ucla oncology that kbinld drugs. then he had roy's tumor genome sequenced. based on the results, roy has now taken part in a clinical trial involving another front in cancer treatment. >> that's the t cell. that is the cancer cell. >> it is called immunotherapy. he is not the only one working on it. he was anxious to show us why oncologists believe it's a promising field. a time lapse...