In Health Watch:Doctors are helping test what may be the next generation therapy for lung cancer patients.It's an experimental approach that uses a virus to attack the disease.Wendy Rigby has the story."Take a deep breath please"78-year-old Maphors Weatherly started spitting up blood in December.When he went to a doctor for help, he got some very bad news.Weatherly says, 'I was absolutely surprised. Very much so.'Tests revealed a huge tumor in his right lung that proved to be cancerous.In fact, stage four cancer.Not curable.Dr. Alain Mita says, 'this is a type of cancer for which not much progress has been made over the last years. And although we have made progress in other areas, there are very few drugs, new drugs for this type of cancer.'Enter a novel biologic agent called "reolysin."It's a viral treatment under investigation at the cancer therapy and research center.Here's how it works.Patients are infused through an i-v with a living virus.Normal cells don't allow the virus to replicate, but cancer cells do.So the virus copies over and over again in the diseased cells until the cells die and release thousands more viruses to continue the work.It targets the cancer with little consequences for normal cells.Weatherly says he's more than willing to give it a try.Weatherly says, 'thought well, what do i have to lose? I'm in stage four, I'm 78 years old. Eventually my time will run out anyhow. Let's do what I can to extend that period of time, you know, that I'm around here.'Doctors are hopeful Reolysin will extend the lives of thousands of people stricken with this killer disease.Dr. Mita says, 'adding this kind of new, promising agent hopefully is going to make a difference and is going to result in long-term benefit.'