Results from the first three rounds of the Scottish demonstration pilot of FOBT screening for colorectal cancer.

Area of Science:

• Oncology
• Public Health
• Gastroenterology

Background:

• Colorectal cancer (CRC) poses a significant public health challenge.
• Population-based screening programs are crucial for early detection and mortality reduction.
• Guaiac faecal occult blood testing (gFOBT) is a widely used screening modality.

Purpose of the Study:

• To evaluate the effectiveness of the initial three rounds of a pilot colorectal cancer screening program in Scotland.
• To assess the feasibility and implications of a national, population-based screening program utilizing gFOBT.

Main Methods:

• A pilot screening program was implemented across three NHS Boards in Scotland.
• The study included residents aged 50-69 years, identified via the Community Health Index.
• Guaiac faecal occult blood testing (gFOBT) was the primary screening tool used.

Main Results:

• Uptake rates ranged from 53.0% to 55.3% across three rounds.
• Cancer detection rates decreased from 2.1/1000 to 0.7/1000 screened over the rounds.
• Positive predictive values for gFOBT declined, while the proportion of early-stage (Dukes' A) cancers detected also decreased over time.

Conclusions:

• The pilot program demonstrated the feasibility of population-based colorectal cancer screening in Scotland.
• Findings suggest that such programs can achieve reductions in CRC-specific mortality, comparable to research-based trials.
• The study supports the implementation of a national screening program.