Incidence of cancer after asthma development: 2 independent population-based cohort studies

Background Evidence regarding the risk of cancer development after asthma diagnosis is controversial and inconclusive. Objective This study sought to determine whether asthma is associated with an increased risk for incident cancer. Methods Two independent, population-based, longitudinal cohorts were examined, and estimated hazard ratios were determined using Cox regression. One group consisted of an unmatched cohort of 475,197 participants and...