A stem cell transplant is often the best option to treat blood cancers, such as leukemia, lymphoma and multiple myeloma, as well as bone marrow failure syndromes like myelodysplastic syndrome.

To understand the different types of stem cell transplants and how they work, we spoke with Borje S. Andersson, M.D., Ph.D. Here’s what he had to say.

What are stem cells?

Bone marrow, the spongy tissue inside our bones, is...