How an overactive immune system can drive cancer

The immune system is designed to protect us against viruses and bacteria. In autoimmune diseases, however, the immune system instead attacks the body's own cells. Conditions such as systemic lupus erythematosus (lupus) and rheumatoid arthritis are well-known examples. It is estimated that just under 250,000 people in Norway live with some form of autoimmune disease, with approximately 8% to 10% of the population worldwide.