Update on the Measles Virus, a Novel Therapy for Glioblastoma, Ovarian Cancer and Multiple Myeloma. Maybe Even Breast Cancer in the Future

Doctors at the Mayo clinic have engineered a new therapy that takes the Measles virus (MV-Edm) Measles Vector Edmonston and it's derivatives (MV-CEA) human carcinoembryonic antigen, which express soluble marker peptides and (MV-NIS) which facilitate imaging and therapy, such as the human thyroidal sodium iodide to be able to track how this virus causes tumor cells to commit suicide. (They are also using polio virus)

To put it in their own words,

"It is of note that a number of viral strains, including certain derivatives of the attenuated live measles virus Edmonston (MV-Edm) vaccine strain, demonstrate a propensity to preferentially infect, propagate in, and destroy cancerous tissues."

Clinical testing of engineered oncolytic measles virus strains in the treatment of cancer: An overview

Update on the measles virus, a novel therapy for glioblastoma

And in plain English:

Mayo Clinic Cancer Center: Harnessing the measles virus to attack cancer