Cancers are difficult to treat without also damaging healthy cells. To help solve this, researchers are trying to make cancer treatment more targeted.
Scientists in the USA have turned skin cells from mice with brain tumours into a type of cell that is naturally attracted to cancer cells. They also engineered the cells to deliver anti-cancer drugs directly into the tumour. Mice treated this way lived longer and had smaller tumours than untreated mice.
I think this is an exciting new development, although human trials are a long way off.