MADRID – Blacks may need additional guidance from clinicians to use radiotherapy for potentially curable lung cancer, a retrospective population-based study suggests.
Among 6,628 patients diagnosed with early-stage nonsquamous non–small cell lung cancer (NSCLC), primary radiation therapy doubled median survival from 11 months to 22.6 months for cases not receiving surgery (Log rank P value less than .0001).
Dr. Eric Flenaugh
Despite the survival advantage, blacks were significantly more likely than whites were to skip radiotherapy for stage IA NSCLC (46% vs. 37.5%; P = .02), Dr. Eric Flenaugh, chief of pulmonary and critical care medicine and vice chair of the department of medicine at Morehouse School of Medicine, Atlanta, reported at the world congress of the American College of Chest Physicians.
A subgroup analysis of nonsurgical stage IA cases in which surgery was not recommended or was contraindicated showed that 61% of whites went on to radiotherapy, compared with 47% of blacks (P = .007). When surgical resection was recommended but not performed, radiotherapy use was similar between races.
"What this basically says is that if they [blacks] chose not to have surgery, then they weren’t going to have anything," Dr. Flenaugh said in an interview. "We have to look at our approach to discussing with African Americans who have curable-stage cancer, particularly the IAs, that if you’re not a surgical candidate or choose not to have surgery, there are other options like radiotherapy that can improve your survival."
The data did not allow the investigators to determine patients’ chemotherapy status or which factors drove the lower uptake of radiotherapy, but prior research has shown that blacks undergo surgery for lung cancer less often than whites, even after access to care has been demonstrated (J. Clin. Oncol. 2006;24:413-8).
The current analysis, led by internal medicine resident Srinadh Annangi, MBBS, used data from the National Cancer Institute’s SEER (Surveillance, Epidemiology, and End Results) database for 6,628 patients diagnosed with NSCLC between 2004 and 2010, of which 4,210 did not receive surgery. NSCLC was staged as IA, IB, IIA, and IIB according to AJCC (American Joint Committee on Cancer) 6th edition classifications.
A little more than half of the 5,915 whites and 713 African-Americans were male, with a median age of 78 years and 67.5 years, respectively.
The proportion of tumors less than 2 cm in size for stages IA and IIA and less than 5 cm for stages IB and IIB was not significantly different between races, according to the poster presentation.
No significant racial disparities were seen for nonsurgical stage IB, IIA, and IIB cancers.
Among operable NSCLC cases, whites were significantly more likely to have surgery than were blacks (37% vs. 32%; P = .0004), whereas blacks were significantly more likely to have surgery recommended but refused or not performed (9% vs. 6%; P = .012).
Importantly, the proportion of blacks undergoing their recommended surgery was lower for both stage IA (78.3% vs. 86%; P less than .05) and IB cancers (74.6% vs. 81.3%; P less than .05).
The authors note that surgical resection remains the preferred treatment approach for operable stage I and II NSCLC, but conclude that eliminating the racial disparities in radiotherapy for early-stage NSCLC deemed inoperable or where surgery is refused can improve survival in the African American population.
Dr. Flenaugh and his coauthors reported no financial disclosures.