How to Use Basic Search

Use the search box found on the home page, the Basic Search page, and at the top of every page of the site to begin searching for clinical studies:

Enter one or more words in the search box and then click on Search. A list of search results will be displayed. The total number of results found is shown below the search box.

Searches Using the Operators AND, OR, and NOT

Words such as AND, OR, and NOT (in uppercase letters), known as operators, tell the search function how the words in your search relate to each other:

Use AND to find study records that contain all the words connected by AND.

Example: prostate cancer AND radiation

This search finds study records containing information on both prostate cancer and radiation. Using AND narrows your search.

Use OR to find study records that contain any of the words connected by OR.

Example: aspirin OR ibuprofen

This search finds study records containing either the word "aspirin" or the word "ibuprofen." Using OR broadens your search.

Use NOT to find study records that do not contain the word following NOT.

Example: immunodeficiency NOT AIDS

This search finds study records containing the word "immunodeficiency" but excludes records containing the word "AIDS" from the search results.


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