Racial disparities in stage 3 lung cancer treatment

ABSTRACT

Background: In the 1990s, it was demonstrated that Black patients were less likely to receive timely treatment for Stage 3 lung cancer than White patients. While contemporary work has found racial disparities in accessing insurance, diagnostics, and treatments, we wished to explore whether patients faced disparities once in treatment. To do this, we examined whether racial disparities were observable in a 2019 cohort of Medicare Advantage beneficiaries receiving treatment for lung cancer. Methods: This retrospective, observational study used health plan claims data to identify Black and White patients aged 18 to 89 years with a Medicare Advantage health plan in calendar year 2019 who received diagnostic imaging (computed tomography or positron emission tomography) followed by lung cancer treatment (radiation therapy [RT] or surgery claims mentioning a diagnosis of lung cancer) within 90 days. Only patients treated in 2019 were considered so that the findings would reflect the state of care immediately preceding the COVID-19 pandemic. Patients were excluded if they had a history of RT or lung surgery in the year prior to the diagnostic imaging date. Other databases were used to determine cancer stage, patient demographics, comorbidities, the urbanicity and median income of patients' home ZIP code, and whether treatment was ordered by a hospital-based physician. A multivariate logistic model was used to examine the association between race and surgery, and a multivariate negative binomial model was used to examine the association between race and days to treatment (surgery or RT). Results: We identified 823 patients, 83.8% White (690), and 16.2% (133) Black. Surgery was received by 3.1% [4/133] of Black patients and 9.7% [61/690]) of White patients. Black patients received treatment on average 36.9 days after diagnosis, versus 35.1 days for White patients. Adjusted analysis did not find a significant association between race and receipt of surgery (P = 0.07) or race and days to treatment (P = 0.77). No covariate was significantly associated with receipt of surgery. Residence in a state with a higher obesity rate was associated with fewer days to treatment (P = 0.02). Conclusions: In a uniformly insured population that successfully received treatment, adjusted analysis found no evidence of a Black / White racial disparity in use of lung surgery for Stage 3 lung cancer or in timeliness of treatment. Given the directionality of the findings, they could potentially have been significant if the sample size had been increased by extending the enrollment period. The implication of these findings is that it may be most fruitful to address racial disparities at the frontend of the care process;working to ensure that patients have access to insurance, diagnostics, and treatments, as disparities were not observed in a population that had accessed treatment. Further research is needed to assess whether racial disparities in lung cancer treatment have dissipated over time.