Could a cancer drug help kids with rare brain disorder?

This study is testing whether a drug called vorinostat is safe and helpful for people with Pitt Hopkins syndrome, a rare genetic condition that affects development. Five participants will each receive a placebo and two different doses of the drug in a special 'N-of-1' design, meaning each person acts as their own comparison. The goal is to see if the drug improves symptoms and to gather data for future larger studies.