Mayo clinic has a clinical trial using the measles vaccine, which has no side effects & works very well. It is injected into the peritoneal cavity & the measles virus destroys the all of the cancer cells that it can reach, before the antibodies get to the virus.
Virotherapy has been around for awhile, but the FDA has never let it out of clinical trials, because the profit margin is too low. Hungary has been using the Newcastles vaccine for years, which is a chicken vaccine, & it has worked well. They use it in a nasal spray. It can be taken through various routes; enema's, inhalation, oral, etc.
Check it out. Some vaccines are obtainable & NCI has lists of the clinical trials using them.
Benjamin