Increased risk of cancer for patients with ankylosing spondylitis: a nationwide population-based retrospective cohort study

Objectives: Few studies have investigated the relationship between ankylosing spondylitis (AS) and other inflammatory spondyloarthritis and subsequent cancer. The aim of this study was to determine whether AS is associated with cancer risk.Method: We used data from the National Health Insurance (NHI) system of Taiwan to investigate this association. The AS cohort included 4133 patients, and each patient was randomly frequency matched with four...