In a new study, researchers have developed and tested one of the first U.S.-based models to predict risk for advanced precancerous polyps and colon cancer in average-risk individuals.
The research was conducted by a team at Regenstrief Institute and Indiana University.
Colorectal cancer is the third most common cancer and the second most lethal cancer in the U.S.
Especially during the COVID-19 pandemic, when many people are hesitant to visit medical facilities and healthcare resources are stretched, the new risk estimation model could help physicians determine whether an average risk patient’s specific risk indicates an at-home stool test would be a good screening option or points to a colonoscopy as the most appropriate option.
The team says the new model helps to define where on the average risk continuum an individual falls.
This information could be used to guide doctor-patient discussions about screening options, with the potential to increase patient acceptance of screening by giving them a choice correlated to their individual risk—true precision medicine.
Studies have shown that giving individuals a choice increases screening uptake as many people look for alternatives to colonoscopy.
Personalized risk-based tailoring of colorectal screening is commonly recommended but not generally used, except for decisions about when to commence screening based on race and family history.
Eight out of 10 individuals who fall within the range for whom colorectal cancer screening is recommended by national guidelines are considered to be at average risk of the disease.
The new predictive model for average-risk individuals considers age, sex, lifestyle, diet, smoking history, and eight other factors.
In the study, the team developed and validated the tool evaluated 4,500 individuals ages 50 to 80 who had not had a previous colonoscopy and identified sizeable lower risk and higher risk groups among average-risk individuals.
About a quarter of average-risk individuals in the study were found to be at 2% risk, which is considered low risk.
Approximately 60% were found to be a medium risk, reflective of truer “average risk.” About 10% were deemed high risk for which a screening colonoscopy is appropriate.
The team says the importance of colorectal cancer screening cannot be overstated.
Particularly during the COVID-19 pandemic, people are less willing to consider screening colonoscopies.
Having an accurate risk assessment tool to determine for whom other options are perfectly good and letting them know which options are suitable is essential.
It also has the added benefits of enabling us to prioritize those who are in greatest need of colonoscopy while conserving potentially scarce resources.
One author of the study is Thomas Imperiale, M.D., of Regenstrief Institute and IU School of Medicine.
The study is published in BMJ.
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