so, it's, really, exactly the sort of tool we've been looking for in routine clinical practice. dr samuel godfrey, research information lead at cancer research uk. talk us through what this potential blood test, what he could mean for us. �* . . blood test, what he could mean for us. �* , . , .. , blood test, what he could mean for us. �* , . , , ., us. it's quite exciting because one ofthe us. it's quite exciting because one of the challenges _ us. it's quite exciting because one of the challenges we _ us. it's quite exciting because one of the challenges we have - us. it's quite exciting because one of the challenges we have with - of the challenges we have with cancer is knowing when treatment is necessary. treatments like chemotherapy save millions of lives every year but what we don't yet know is who definitely needs chemotherapy for sub 20 people who get given it probably would be fine without it and on to note there was no real way to tell who should get chemotherapy and who shouldn't. anything we can do that can put people in the right buckets and make sure doctors are giving them treatment only to people who need it is a big step towards personalising