myGVHDteam

Great question! After a stem cell transplant, the donor cells don't simply take over everything — it's more of a coexistence, at least at first.

Before the transplant, high-dose chemotherapy (sometimes combined with radiation) is used to destroy the existing bone marrow. This clears the way for the donor stem cells to move Show Full Answer

Great question! After a stem cell transplant, the donor cells don't simply take over everything — it's more of a coexistence, at least at first.

Before the transplant, high-dose chemotherapy (sometimes combined with radiation) is used to destroy the existing bone marrow. This clears the way for the donor stem cells to move in and set up shop. Once transplanted, the donor stem cells begin rebuilding the blood and immune system. Over time, they produce:

- Red blood cells that carry oxygen
- White blood cells that fight infections
- Platelets that help with clotting

So the donor cells gradually become the primary source of new blood cells. However, the rest of your body — organs, tissues, skin — remains your own. This is actually why GVHD can occur: the donor immune cells can sometimes see your body's own tissues as "foreign" and attack them.

 AI-generated responses are not a substitute for medical advice. These services are not intended to diagnose, treat, or cure any condition or disease. Always ask your doctor about specific health concerns.

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