Quite simply the cellular, immune and endocrine systems have gone somewhat haywire. There is some degree of auto-immune response and the immune system is working against itself. Many nutritional deficiencies are seen in cancer. In general there is an over-run of pathogens such as virus, bacteria, yeast and candida depressing the immune system wreaking havoc on the body as a whole. This is much too broad a topic to discuss here and I am by no means trying to over-simply this dis-ease process. Diet and nutrition play an important role in preventing and treating cancer.