The white blood cell production can be stimulated by the so
called human granulocyte colony-stimulating factor. This is
prescribed by a specialized physician when patients under certain
chemotherapy treatment have a very low white cell count.
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Examples of colony stimulating factors are filgrastim (Neupogen)
and sargramostim (Leukine).
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Although colony stimulating factors help restore the body's
natural defenses, the process takes time.