A Genetic Result That Brought Clarity
Colorectal Cancer Awareness Month and the Role of Genetics
Each March, Colorectal Cancer Awareness Month highlights the importance of screening, early detection, and understanding hereditary risk factors.
While many cases of colorectal cancer occur sporadically, up to 10% of colorectal cancers are linked to hereditary cancer syndromes. In these families, inherited genetic variants can significantly influence cancer risk and guide screening decisions.
Genetic testing plays a powerful role in identifying individuals who may be at risk for hereditary colorectal cancer, allowing patients and their healthcare providers to take proactive steps toward prevention and early detection.
Recently, one of our genetic counselors worked with a patient whose experience illustrates how genetic information can transform uncertainty into clarity.
A Variant in the APC Gene
Recently a patient met with one of our genetic counselors after receiving a genetic test result showing a pathogenic variant in the APC gene.
The APC gene is most commonly associated with Familial Adenomatous Polyposis (FAP), a hereditary condition that greatly increases the risk of colorectal cancer. Individuals with classic FAP may develop hundreds to thousands of colon polyps and often require early and frequent screening.
Understandably, the patient was alarmed. However, further review of the genetic result revealed an important detail. The patient carried a milder APC variant, one that does not cause the severe polyp burden or extremely high colorectal cancer risk typically associated with classic FAP.
During genetic counseling, she learned several important points:
- APC gene variants exist on a spectrum
- Not all APC mutations cause classic FAP
- Her specific APC variant carries a significantly lower colorectal cancer risk than she initially feared
For the patient, this explanation brought immediate relief. It also highlights a critical truth in genetic medicine: identifying a variant is only the first step, interpreting it accurately is what truly informs care.
When Family History Reveals Additional Clues
During the counseling session, the patient also shared something important about her family history. Several close relatives had been diagnosed with breast cancer in their early thirties.
This pattern raised additional questions. While APC variants are linked to colorectal cancer risk, early-onset breast cancer is typically associated with other hereditary cancer genes, such as BRCA1 and BRCA2.
When the patient asked whether her family members should be tested for the APC variant, the answer required a broader perspective. While relatives could consider APC testing, a more informative approach would be a comprehensive hereditary cancer panel, which evaluates multiple genes associated with inherited cancer risk.
A broader panel can assess genes linked to:
- Hereditary colorectal cancer
- Hereditary breast and ovarian cancer syndromes
- Other hereditary cancer conditions
By evaluating multiple genes simultaneously, healthcare providers can develop a more complete understanding of cancer risk within a family.
Why This Story Matters for Colorectal Cancer Awareness
This patient’s experience highlights several important lessons during Colorectal Cancer Awareness Month:
- Hereditary colorectal cancer risk can vary widely
- Even within the same gene, variants can lead to very different levels of cancer risk and screening recommendations.
- Genetic results require expert interpretation
- Understanding the clinical significance of a variant helps ensure patients receive appropriate guidance and care.
- Family history remains essential
- Patterns of cancer across generations can provide critical clues to underlying hereditary cancer syndromes.
- Comprehensive genetic testing may reveal the bigger picture
- A hereditary cancer panel can identify risks that may not be detected through single-gene testing alone.
Genetic Testing and the Future of Colorectal Cancer Prevention
Colorectal cancer is one of the most preventable cancers when risk is identified early. When individuals understand their genetic risk, they can work with healthcare providers to implement personalized screening and prevention strategies.
At Otogenetics, we believe genetic testing should provide more than a result. It should offer clear, accurate insights that empower patients and healthcare providers to make informed decisions about cancer prevention.
Learn More About Hereditary Cancer Risk
Otogenetics offers comprehensive hereditary cancer genetic testing panels designed to evaluate genes associated with colorectal, breast, ovarian, and other inherited cancer syndromes.
By combining advanced sequencing technology with clear clinical interpretation, our testing helps healthcare providers and patients better understand hereditary cancer risk and take proactive steps toward prevention.
Learn more about Otogenetics’ hereditary cancer testing and how genetic insights can support earlier detection and personalized care.