Triple X syndrome is a form of chromosomal variation characterized by the presence of an extra X chromosome in each cell of a human female.
Triple-X syndrome is listed as a "rare disease" by the Office of Rare Diseases (ORD) of the National Institutes of Health (NIH). Approximately 0.10% or 1 per 1,000 newborn girls suffer from triple X syndrome.
The chromosome change that causes triple X syndrome cannot be repaired, so the syndrome itself has no cure but it's quite possible to live normal life with this syndrome.
Research in this field increased as the genetic mechanisms of the syndrome are understood to the full extent permitted by modern genetic tools and understanding.