Can saliva save poeple from cancer? Simple saliva test for cancer patients

A revolutionary system has been created to find out the bone marrow transplant donors and this system and the test will begin on Monday - requiring only a saliva test, and no any kind of blood-extraction or whatever.

This system that has been developed in united states does involves a ver simple kind of test that is made to find out the matching donors for marrow transplants by first taking out samples of the saliva of the donors and thus avoiding any kind of need to extract their blood samples for analysis.