Question

what disease, which has killed more than 200 million people, is being used to treat myeloma (bone marrow cancer)?
measles
hiv
cancer
small pox
rewatch

Explanation:

Measles has been explored as a treatment for myeloma due to its oncolytic properties. HIV is a virus that attacks the immune - system, and cancer is not a disease used to treat cancer in this context. Smallpox has been eradicated and is not used for such treatments.

Answer:

Measles