Dr Jianguang Ji, Lund University, and Skåne University Hospital, Malmö, Sweden, and colleagues investigated data from the Swedish Cancer Registry. Researchers analyzed Swedish hospital data from 1969 to 2008. They found 1,510 patients with Huntington's disease. During the study period, 91 of those patients subsequently developed cancer. The authors said that was 53% lower than the levels expected for the general population.