General descriptive information.

1Registry acronyms stand for: Australian New Zealand Clinical Trials Registry (ANZCTR), Chinese Clinical Trial Register (ChiCTR), Clinical Trials Registry - India (CTRI), German Clinical Trials Register (DRKS), Iranian Registry of Clinical Trials (IRCT), International Standard Randomized Controlled Trial Number Register (ISRCTN), The Netherlands National Trial Register (NTR), Sri Lanka Clinical Trials Registry (SLCTR).
2Other sponsors consisted of persons that were registered as primary sponsor, non-governmental organizations, collaborative research institutions and clinical research organizations.
3Overlap was possible, total in this category is greater than 731.
4Genetic interventions consisted of gene transfer therapy and somatic cell transplants.
5The presence of study phase in records was analysed separately for trials in drugs, biologicals or vaccines. Of 439 trials researching these types of interventions, study phase was reported in 370 records (84.3%).
6For single arm trials, randomization is not applicable. However, one single arm trial was registered as being randomized.