What is immunotherapy and how does it treat cancer and other conditions?

From infections and allergies to brain diseases and autoimmune disorders, a wave of trials offers hope

Clinical trials of immunotherapies have rocketed in the past decade as researchers have turned their understanding of the body’s defences into powerful new treatments. Leading the pack are cancer therapies, but researchers have other conditions in their sights, from infections and allergies to brain diseases and autoimmune disorders. Here, we explore how these therapies work.