Study Suggests Change in Lung Cancer Screening Guidelines

A recent study from Northwestern Medicine indicates that current lung cancer screening guidelines might overlook a significant number of Americans diagnosed with lung cancer. Researchers are advocating for a substantial shift in these guidelines.

This study, which was published in JAMA Network Open, examined nearly 1,000 lung cancer patients treated at Northwestern Medicine from 2018 to 2023. The aim was to see how many of these individuals would qualify for screening based on the existing recommendations from the United States Preventive Services Task Force (USPSTF).

Currently, the USPSTF suggests an annual CT scan for adults aged 50 to 80 who have a smoking history of at least 20 packs a year. Interestingly, only about 35% of those diagnosed with lung cancer actually meet these screening criteria, meaning roughly two-thirds of patients were not identified for testing before their diagnosis.

Dr. Luis Herrera, a thoracic surgeon at Orlando Health, pointed out that this approach not only misses individuals who have quit smoking but also overlooks non-smokers at risk for lung cancer. Generally, these overlooked cases tend to involve adenocarcinoma, which is the most prevalent type of lung cancer among non-smokers.

Further findings revealed that those who did not fit the screening criteria were often women, individuals of Asian descent, and non-smokers. The research team also studied survival outcomes, discovering that patients who failed to meet the criteria had a median survival of 9.5 years, compared to just 4.4 years for those who were screened.

While this survival rate difference reflects tumor biology and the benefits of early detection, it also underscores how current screening rules are missing a broad spectrum of cases that could be treated earlier. Dr. Herrera, who was not part of the research team, noted that participation rates for lung cancer screening remain low among those eligible, likely due to complicated criteria and societal stigma associated with smoking.

To explore an alternative, the researchers proposed a new screening method that would cover everyone ages 40 to 85, regardless of their smoking history. The simulation suggests that this universal screening approach could detect about 94% of cancers in the studied cohort.

The researchers estimate that such a change could save around 26,000 lives annually in the U.S., at an estimated cost of roughly $101,000 for each life saved. They argue this method is notably more cost-effective compared to existing breast and colorectal cancer screening practices, which cost between $890,000 and $920,000 per life saved.

Despite the potential benefits, there are challenges to implementing broader lung cancer screening. Some healthcare providers still don’t recommend these tests, possibly due to a lack of awareness. However, Dr. Herrera reminded that many health insurance plans cover the test, and discounts may be available for uninsured patients.

Lung cancer continues to be the deadliest cancer in the U.S., causing more deaths each year than colon, prostate, and breast cancer combined, yet many high-risk individuals don’t get tested mainly due to the stringent eligibility criteria based on smoking history. Researchers from Northwestern Medicine argue that widening the screening eligibility could address these gaps, especially for often underdiagnosed groups.

It’s important to note that this study was conducted at a single academic center, which may not accurately represent the broader U.S. population. The researchers acknowledged that they couldn’t confirm how a new model would function in real-world screening scenarios; their findings were based on retrospective data.

Cost and mortality estimates in the study rely on assumptions that might vary based on the actual implementation of the screening. The researchers also mentioned not fully considering the potential downsides of more extensive screening, such as false positives or unnecessary follow-up tests.

For patients not eligible for lung cancer screening, there are still other ways to evaluate lung health, including tests like cardiac calcium scores and various imaging methods that can help identify suspicious nodules.