In other words... we *can* change our genes... and we can reduce and eliminate any familial genetic disease *predispositions*.
Many disease that are considered hereditary such as cancer and diabetes are not hereditary in the first place.
And many of these studies are done in test tube, which do not correlate to the body. For example viruses can infect cells causing them to go cancerous but because their genetic expression has changed these cells are considered foreign and are often destroyed by the body's immune system.