>By sequencing the abnormal DNA that a tumor releases into a person’s bloodstream. I didn't say just ones that effect the blood. Getting to a blood supply is p

>By sequencing the abnormal DNA that a tumor releases into a person’s bloodstream. I didn't say just ones that effect the blood. Getting to a blood supply is pretty bad too, makes it so the tumor can grow more. Many non-blood cancers can spread via the blood, which is also very bad.