This was a regulatory rather than a scientific breakthrough. Using preimplantation-genetic diagnosis, the parents were able to choose an embryo that did not carry the BRCA gene, with an 80% chance of ensuing breast cancer. Whilst this does not cure or enhance the life of the gentically afflicted, this furthers the power of parents to use whatever medical technologies are available in safety and without too much oversight from the state.
Concerns about designer babies appear a shibboleth at this juncture.