Gene Therapy

As cancer is a disease caused by damaged DNA, many researchers have tried to find ways to correct this damage by correcting the DNA itself.
Some gene therapy strategies aim to replace damaged genes with copies that work - like replacing a faulty part of a car that has broken down.
For example, the p53 gene, which normally acts as a brake on cell division, is defective in the majority of human cancers. Many attempts have been made to try to replace the damaged copy of p53 in a tumour with a working one, but, as yet, none has been particularly successful.

read more at http://info.cancerresearchuk.org/cancerandresearch/learnaboutcancer/treatment/genetherapy/?a=5441