What are the chemotherapy regimens for relapsed leukemia?

There are different types of leukemias, and going into the treatment regime for each one is beyond the scope of this QnA.

For example, there are 4 main types of leukemia alone:

1. Acute myeloid leukemia (AML)
2. Chronic myeloid leukemia (CML)
3. Acute lymphocytic leukemia (ALL)
4. Chronic lymphocytic leukemia (CLL)

I’d advise speaking to an oncologist to discuss about your query, as he will be able to provide a much more helpful answer in the context of additional details.

Cheers