The American Cancer Society has updated its screening guidelines for colorectal cancer to include blood tests, providing a new option for those who prefer to avoid more invasive procedures. This update is significant as colorectal cancer cases are rising among younger populations.

New Screening Options

Traditionally, colonoscopies have been the primary method for detecting colorectal cancer, allowing doctors to examine the colon and rectum for signs of disease. However, many individuals avoid these procedures due to their invasive nature. Stool-based tests have also been available, yet some find the process of collecting samples at home unappealing.

To address these concerns, the American Cancer Society now recommends the Shield test, a blood-based screening developed by Guardant Health, for adults aged 45 and older who are at average risk and have not completed other recommended tests. This test was approved by the FDA in 2024 and is covered by Medicare.

Effectiveness and Limitations

While the Shield test offers a less invasive option, it is not as sensitive as colonoscopies or stool tests in detecting early-stage cancers or precancerous polyps. It is recommended primarily for those who decline other screening methods. The test detects signals of colorectal cancer from tumor DNA in the blood, and a positive result should be followed by a colonoscopy.

Experts like Dr. William Dahut from the American Cancer Society emphasize that while blood tests are a valuable addition, they should not replace more sensitive tests when patients are willing to undergo them. The goal is to increase screening rates and catch cancers earlier, improving survival rates.

Future of Cancer Screening

As technology advances, more blood-based tests are expected to emerge, potentially reducing barriers to effective screening. Dr. Scott Kopetz from MD Anderson Cancer Center notes that while the Shield test is a step forward, future developments may enhance performance and accessibility.

For now, individuals with symptoms or a family history of colorectal cancer should consult their doctors about the most appropriate screening methods. The updated guidelines aim to broaden screening options, particularly for younger, at-risk populations, acknowledging that no single method fits all.

Original reporting: KRDO (Colorado Springs metro) — read the source article.