the patients so when the primary tumor somehow transported to a distant site that grows a new tumor and a grow to grow everywhere that kills the patient so CTC or circulating tumor cells are very important because this is one mechanism where cancer cells spread now we're able to monitor you'll see these flashes of white ash these are circulating tumor cells if we can man identify them in the bloodstream right you can do multiple things to stop the metastasis right you could well you can imagine that potentially you can