Blood Transfusions and Cancer Treatment Herbert A. Perkins, MD Blood is a complex living tissue . It is made up of three kinds of cells that are manufactured in the blood cell "factory"—the marrow cavity of our bones. All these cells are suspended in a liquid called plasma, and each cell plays a critical role in keeping us alive. • Red blood cells carry oxygen to our tissues. • White blood cells—leukocytes—help us fight off infections. • Platelets are necessary to form the blood clots that stop bleeding. Blood transfusions play a crucial role in cancer treatment. The disease can reduce the marrow's ability to produce blood cells, sometimes so severely that the cells have to