# National Cancer Institute (NCI): Observational study closed enrollment, 154900 enrolled (Cancer, Death)

**Score:** 40/100

| Field | Value |
|---|---|
| Sponsor | National Cancer Institute (NCI) |
| Sponsor type | NIH |
| Study | Prostate Lung Colorectal and Ovarian (PLCO) Cancer Screening Trial |
| NCT ID | NCT00339495 |
| Phase | Observational |
| Status | active not recruiting |
| Conditions | Cancer; Death |
| Target enrollment | 154900 |
| Site countries | United States |
| Posted | 2006-06-21 |
| Planned start | 1998-05-01 |
| Event | Enrollment closed (active, not recruiting) |
| Event date | 2026-10-02 |
| Last update posted | 2026-10-02 |

## Why this score
- Enrollment closed: data management, monitoring and closeout ahead.
- 154900 participants planned.

Source: ClinicalTrials.gov (U.S. National Library of Medicine) API v2 (https://clinicaltrials.gov/study/NCT00339495). Last refreshed: 2026-11-05T08:46:16.625Z.
From public ClinicalTrials.gov registrations. Sponsor and study level only: we never list investigators, contacts or participants. A registration describes a planned study and can change. Status changes are read from each study's current status, actual dates and latest posted update, not a full change history, so an update can be a correction rather than a new change. Verify on ClinicalTrials.gov.