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Health Disparity Exists Within Lung Screening Guidelines


 

Guidelines that determine which smokers qualify for CT scans are excluding a significant number of African Americans who develop lung cancer, according to a study released June 27 in JAMA Oncology. The health disparity merits modifications to lung cancer screening criteria, said lead author Melinda Aldrich, PhD, MPH, assistant professor of Thoracic Surgery at Vanderbilt University Medical Center.

"Among smokers diagnosed with lung cancer, 32 percent of African Americans versus 56 percent of whites were eligible for screening, so it's a striking disparity in eligibility," Aldrich said.

The study reviewed cancer incidence data on 48,364 smokers from the Southern Community Cohort Study in one of the largest comprehensive evaluations to date of lung cancer screening guidelines established by the U.S. Preventive Services Task Force (USPSTF).

The USPSTF issued the guidelines in 2013 after the National Lung Screening Trial demonstrated that CT scans provided early detection of lung cancer and reduced deaths from the disease by 20 percent compared to participants who received standard chest X-rays.

Aldrich and fellow researchers concluded that those guidelines might be too conservative for African Americans, setting the stage for later diagnoses and reduced odds of survival.

The guidelines, which insurance companies follow in determining coverage for CT scans, are based on smoking history and age. However, studies have shown that African Americans have a higher risk of lung cancer than whites even if they smoke less over time. The USPSTF guidelines currently recommend screenings for smokers age 55 to 80 who have a 30 pack-year history and who still smoke or have quit within 15 years. The researchers calculated that lowering the threshold for African Americans to a minimum 20 pack-year history increased their eligibility and resulted in more equitable screening eligibility.

"This is a proposal for the first step, acknowledging that the guidelines are inadequate -- woefully inadequate, actually, as they exist right now -- with a suggested change that would largely correct the disparity," said William Blot, PhD, associate director for Population Science Research at Vanderbilt-Ingram Cancer Center, research professor of Medicine and Ingram Professor of Cancer Research.

The study also noted that the mean age for lung cancer diagnosis occurs significantly earlier in African Americans compared to whites. Among patients diagnosed with stage IV lung cancer, the median age for diagnosis for whites was 63 compared to 59 for African Americans.

Modifying the minimum age for African Americans from 55 to 50 would also increase the eligibility percentage. "The age shift may be equally important because it will shift the age at which we can diagnose African Americans to an earlier cancer stage and have better potential for curative treatment," Aldrich said. "If we don't shift that, then we are still going to potentially diagnose African Americans at a later stage."

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