A stem cell transplant (SCT) is a medical procedure used to replace damaged or destroyed bone marrow with healthy stem cells. It’s commonly used to treat blood cancers like leukemia, lymphoma, and multiple myeloma. The procedure involves high-dose chemotherapy to destroy the diseased cells, followed by an infusion of healthy stem cells to restore normal blood cell production. Stem cell transplants can help rebuild the immune system and improve long-term survival rates for patients with certain types of cancer.