This describes the trial, explaining how and what data was collected. The main findings of the study can be found here.

• Trial Summary
  This describes the history, organization and overview of the study's protocol.
• Data Collected
  This includes details of protocols for questionnaires, screening, and ascertainment of cancer and mortality data.
• Data Tables
  This page shows how many cancers are available on this website for multiple cohorts.
• Biospecimens Collected
  This describes the biospecimens collected from the PLCO trial.
• Biospecimen Tables
  You may check the availability of different types of PLCO biospecimens.
• Main Findings
  This page lists a collection of 14 trial publications summarizing the recruitment and outcomes of the study.