Cancerous cells emerge in the body all the time. They aren’t usually harmful because the body’s immune system clears them away before they have an opportunity to cause disease. However, this cancer-clearing system can sometimes malfunction, and tumors grow unchecked.
Immunotherapy is a set of treatments that attempt to cajole the immune system into fighting cancer cells more effectively. Since scientists first developed it, it has become a popular treatment choice, due to its non-invasiveness compared to standard therapies.