At a talk I attended today, this resource of patient cancer diagnoses was mentioned as an example of publicly available clinical data. A quick look over the documentation suggests it might be an interesting project to produce an RDF version of the data set.
http://seer.cancer.gov/data/The SEER limited-use data* include SEER incidence and population data associated by age, sex, race, year of diagnosis, and geographic areas (including SEER registry and county)
-Alan
