One of Ashworth's major contributions to cancer research has been his work on genes involved in cancer risk. He was a key part of the team that in 1995 discovered the BRCA2 gene, which is linked to an increased risk of some types of cancers/ which is now used to identify women at high risk of the disease. Ten years later, Ashworth identified a way to exploit genetic weaknesses in cancer cells including mutated BRCA 1 or BRCA2, leading to a new approach to work on Poly ADP ribose polymerase (PARP) as a drug target for cancer.
