This approach has been severely criticized on several counts. For example, it presumes that the cancer just somehow appeared regardless of the lack of involvement of the immune system. Normally, it is thought that cancerous cells are continuously created but the immune system detects and destroys them before the gang gets too large. Clearly, then, if cancer appears the immune system is weak and unable to do its job. Rather than bolstering the immune system, conventional medicine destroys it even more with strong immune suppressants .
Cancer is a systemic disease that needs to be dealt with in a holistic manner.
In fairness to conventional medicine, it has been a standard idea that cancer cells do not trigger an immune response by the body. Given this idea, the only other recourse is to eliminate the tumor by what ever means necessary. This idea may not be correct, however. Cancer therapy does considerable damage to the body which further weakens it and diverts energy and resources away from dealing with the cancer and toward repairing the damage from therapy. In only a few relatively rare cancers do chemotherapies and radiation work.