he is professor of cancer medicine and founding dean of the university of buckingham medical school. he joins us now from london. thank you very much for joining us on the, on their news are. so in your opinion, how significant a development might this test turn out to be? so, to be honest, we just don't know what it has to be, try it out in the population. and it's great that it's a single system of health care delivery. when you compare those that have the chest 2 years every year and those that don't. and so the plan is to gather 840000 people and 270002 give them the test every year. and the results. the other 70000 blog will just be stored and then you can see how the cancer experience is for them to grow. should always say we're going to people over 50 percent to be cancer becomes more common as people get. okay, so obviously the size of the population going through this trial is, is very important from what we know so far about this test. other, any types of cancer that there's blood test cannot detect? no, it's basically everyone's familiar with pcr testing for cobra. now eve