ClinicalTrials.gov (CTG) contains data on trials.

CTG staff and CTG record processing assigns each trial MeSH keywords that indicate trial conditions and trial interventions.

Some trials have **basic summary results data**. CTG results have mandatory components and optional components. Mandatory components include 2 tables: Serious adverse events and Other adverse events.

Example of XML data on a trial is provided here: 
http://clinicaltrials.gov/ct2/show/NCT00521599?resultsxml=true 
http://clinicaltrials.gov/ct2/show/NCT00521599 
http://clinicaltrials.gov/ct2/show/results/NCT00521599