My friend says she has type iv colon cancer, and it is blood borne, so she is going to have chemo. what does it mean when it becomes blood borne?

Cancer begins: In one organ, but kills by traveling to others and detroying function. Colon cancer travels, either by blood or lymphatics, to the lover, bones, lungs and brain.

Not a blood borne : I think most likely your friend missunderstood about " blood borne". Colon cancer is not a blood borne disease. It is not infection. Probably she meant that the disease has spread beyond the colon to other organ through her lymphatic system or blood.

Spread via blood: This means that tumor cells have spread to distant organs or sites via the bloodstream.