A lady is reported to have been self cured of a horrible rare disease (WHIM syndrome) when her DNA mutated.
This mutation just happened to be perfect to cure her body.
An event called "chromosomal shattering" in which a part of the DNA is rearranged led to 164 genes being lopped out of her DNA. Crucially this included the mutated one that was causing the problem.
If this had happened in a muscle cell it would have made no difference to her. But it took place in a stem cell that manufactures immune cells.
Woman 'cured by lucky DNA mutation'