How can a cancer patient's blood disappear after a transfusion?

How can a cancer patient's blood disappear after a transfusion?
Blood cells own a short life. They die rotten naturally and entail to be replaced. The blood always wants a constant supply of fresh cells. Just close to your hair is other growing, your blood is always growing, too.
Normally the bone marrow produces the cell. In cancer patients on chemotherapy, the marrow is suppressed and doesn't make cell for a while after the chemo. So they sometimes receive transfusions.
The red cells will finishing for a few weeks, the platelets will last for lately a few days. White cells die bad so quickly that it is usually not worthwhile to transfuse them.
Sometimes patients will be given medicine to stimulate the marrow to produce more cells (procrit for red cell, neupogen for white cells) and that can help to avoid transfusions and infections.
Your Red Blood cell don't last forever, they breakdown and get hold of passed out through your body as waste. These are the cell that primarily make up blood and take oxygen to your tissues. Your body should be producing them as fast as they will. In cancer patients, these mechanisms don't work and adjectives kinds of blood cell are low because of it. Transfusions help provide them a boost but don't last because of your bodies instinctive way of using them.