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Government Funding Lapse

Because of a lapse in government funding, the information on this website may not be up to date, transactions submitted via the website may not be processed, and the agency may not be able to respond to inquiries until appropriations are enacted. The NIH Clinical Center (the research hospital of NIH) is open. For more details about its operating status, please visit  cc.nih.gov. Updates regarding government operating status and resumption of normal operations can be found at OPM.gov.

Data Collected

A vast amount of data was collected in the PLCO trial, covering various areas of focus from a variety of sources. The purpose of this section is to break down the data by topic, to explain how it was collected and identify in what files the data can be found.

The bullets to the left are arranged in a loosely chronological order, beginning with questionnaires completed near the start of the trial, through screening, cancer diagnoses and other events of interest, and ending with exit conditions, mortality information and general data cleaning and compilation into files.