For one point about anticancer genes is that several have to go wrong in the same cell before a tumour can grow.

ECONOMIST: Cancer genetics

Zinc fingers, so named because they contain a zinc atom and are shaped like an index finger, can turn specific genes off or on or to some point in between, delete genes altogether or add new genetic material.

FORBES: Magazine Article

But from the point of view of the selfish genes themselves, there is no paradox.

FORBES: The Myth ... of the Myth of Junk DNA

"There are some people who say we should never do this, from an ethical point of view it is wrong to tamper with the genes of future generations, " he told BBC News Online.

BBC: Scientists oppose human gene modification

The other point to make from this: For the first time, this study tells us about new genes we had no idea had anything to do with breast cancer.

CNN: Mutated genes may cause breast cancer