Immune Cell that kills cancer

I just had a client here that had bladder cancer. Diagnosed 2 years ago. In full remission today.

We began to discuss...no chemo.

The did immunotherapy. He was actually given attenuated Tuberculosis thru catheter direct into bladder. Within 6 months, full remission. The best part was absolutely minimal side effects.

I think i remember watching a Vice story how docs use attenuated viruses to trick the immune system into attacking the virus when its attached to the cancer ( cells/tumor) with great success.

This is really amazing if they stumbled upon something even greater!