Patients who undergo potentially curative surgery for colorectal cancer have an increased risk of recurrence. To reduce that risk, guidelines have been developed that specify a combination of regularly scheduled physician visits, colonoscopy, and other tests to detect changes that could indicate a recurrence. While some patients may not receive these recommended services, others may undergo other procedures, such as computerized tomography (CT) and positron emission tomography (PET) scans, which are generally not recommended. Therefore, some patients may not meet guidelines standards while others receive testing that goes beyond guideline recommendations.
Study researchers analyzed information from the Surveillance, Epidemiology and End Results (SEER) program of cancer registries and Medicare claims. They assessed overall adherence to guidelines as well as differences across patient subgroups.
A total of 9,426 patients over age 65 who were diagnosed with adenocarcinoma of the colon or rectum from 2000-2001 were included in the analysis. Patients were followed up to three years after diagnosis. The study investigators considered the screening guidelines to be fulfilled if a patient received two or more office visits per year, two or more carcinoembryonic antigen (CEA) tests per year, and at least one colonoscopy within three years.
Overall, six in 10 (60.2 percent) of patients received testing below recommended levels, while fewer than one in five (17.1 percent) received testing at the recommended frequency. Nearly one in four (22.7 percent) received follow-up services above those specified by screening guidelines. The researchers said that while some of the difference could be explained by clinical factors, such as stage of disease, they also found important differences across racial groups and region.
The researchers said the generally lower use of testing in African Americans is likely a contributing factor to the known poorer stage-specific survival compared to Caucasians. In addition, geographic differences across SEER sites suggest that patient and physician preferences may influence choice of testing.
“Further studies should ascertain the reasons for poor compliance and the effect on patient outcome,” study authors wrote.