Peutz-Jeghers syndrome (PJS) and juvenile polyposis syndrome (JPS) are hamartomatous polyposis syndromes associated with increased cancer risk. The Danish national health registries systematically record health

The hamartomatous polyposis syndromes include Peutz-Jeghers syndrome, juvenile polyposis syndrome, PTEN hamartoma tumor syndrome (Cowden’s and Bannayan-Riley-Ruvalcaba syndromes), and hereditary mixed polyposis syndrome. This document is a