The US National Institutes of Health's National Cancer Institute provides this site, a gateway to clinical trials information. Central to the site is access to PDQ (Physician Data Query), a searchable database of over 1,500 cancer trials. PDQ can be searched by up to ten diagnostic and geographic variables, as well as by trials added to the database in the last month. Retrieved information includes rationale, purpose, eligibility, treatment, and contact information, as well as relevant links to a glossary and clinical trial abstracts. In addition, the site contains information on defining clinical trials, deciding whether to participate in one, and a budding cancer research news section.