Apparently British scientists have created a made-to-order embryo that does not inherit a possibly cancer causing gene:

With the aid of genetics specialists, a woman has been able to make sure that her baby does not inherit a gene that might trigger a form a eye cancer. The lass - who has requested anonymity - and her husband are the first to tap a change in the laws around embryo screening. Previous rules dictated that mothers-to-be could only screen for genes guaranteed to lead to disease. In the case of the eye cancer, close to 90 per cent of the people with the gene actually get cancer, the paper reported.