Association Between Food and Drug Administration Approval and Disparities in Immunotherapy Use Among Patients With Cancer in the US

IMPORTANCE Clinical trials and compassionate use agreements provide selected patients with access to potentially life-saving treatments before approval by the Food and Drug Administration (FDA). Approval from the FDA decreases a number of access barriers; however, it is unknown whether FDA approval is associated with increases in the equitable use of novel therapies and reductions in disparities in use among patients with cancer in the US. OBJECTIVE To assess the association between FDA drug approval and disparities in the use of immunotherapy across health, sociodemographic, and socioeconomic strata before and after approval of the first checkpoint inhibitors for the treatment of patients with cancer in the US. DESIGN, SETTING, AND PARTICIPANTS This cohort study used data from the National Cancer Database to examine the use of immunotherapy across health, sociodemographic, and socioeconomic strata before and after FDA approval of the first checkpoint inhibitor therapies. A total of 402 689 patients 20 years or older who were diagnosed with stage IV non-small cell lung cancer (NSCLC), renal cell carcinoma (RCC), or melanoma of the skin between January 1, 2007, and December 31, 2018 (specific years varied by tumor type), were included. EXPOSURES Patient health (Charlson-Deyo comorbidity score and age), sociodemographic characteristics (sex, race, and ethnicity), and socioeconomic (insurance status and household income based on zip code of residence) characteristics. MAIN OUTCOMES AND MEASURES The association of patient characteristics with receipt of immunotherapy was evaluated in the 4 years before and the 3 years immediately after FDA approval using multivariable logistic regression modeling. RESULTS Among 402 689 patients (median [IQR] age, 68 [60-76 years]; 225 081 men [55.9%]), 347 233 had NSCLC, 43 714 had RCC, and 11 742 patients had melanoma. A total of 47 527 patients (11.8%) were Black, 15 763 (3.9%) were Hispanic, 375 874 (93.3%) were non-Hispanic, 335 833 (83.4%) were White, and 16 553 (4.1%) were of other races. Before FDA approval, 6271 patients (3.2%) with NSCLC, 1155 patients (4.8%) with RCC, and 504 patients (8.6%) with melanoma received immunotherapy compared with 23 908 patients (15.6%) with NSCLC, 3890 patients (19.7%) with RCC, and 1143 patients (19.3%) with melanoma after FDA approval. Before FDA approval, sociodemographic and socioeconomic characteristics were associated with variable immunotherapy administration by tumor type. For example, among those with NSCLC, Black patients were less likely to receive immunotherapy than White patients (odds ratio [OR], 0.78; 95% CI ,0.71-0.85; P < .001); among those with RCC, uninsured patients were less likely to receive immunotherapy than privately insured patients (OR, 0.31; 95% CI, 0.20-0.48; P < .001). After FDA approval, most disparities persisted, but several narrowed (eg, Black patients with NSCLC: OR, 0.87 [95% CI, 0.83-0.91; P < .001]; uninsured patients with RCC: OR, 0.60 [95% CI, 0.48-0.75; P < .001]). Although many disparities remained, some gaps across socioeconomic characteristics appeared to widen (eg, patients with NSCLC in the lowest vs highest income quartile: OR, 0.80; 95% CI, 0.76-0.83; P < .001), and new gaps emerged (eg, Black patients with RCC: OR, 0.82; 95% CI, 0.72-0.93; P = .003). CONCLUSIONS AND RELEVANCE In this cohort study, disparities in immunotherapy use existed across a number of sociodemographic and socioeconomic characteristics among patients with NSCLC, RCC, and melanoma before FDA approval, including during the important period when clinical trials were accruing patients. Although FDA approval was associated with a significant increase in the use of immunotherapy, gaps persisted, suggesting that FDA approval may not eliminate disparities in the use of novel therapies.