'It's incredible, like science fiction': How a new wave of immunotherapy is eliminating cancers

The body has a natural ability to "detect and eliminate cells that look like not-you," explains Karen Knudsen, chief executive of the Parker Institute for Cancer Immunotherapy, a US nonprofit that furthers immunotherapy development. If all is working well, that should include cells that have become cancerous. But sometimes, cancer cells evade or outsmart that system, leading to dangerous unchecked growth. They hide, in plain sight, indistinguishable from the healthy cells around them.