Continued implications of the COVID-19 pandemic environment on non-small cell lung cancer characteristics and treatment in the United States

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Background: Given the continued disruption of the coronavirus disease 2019 (COVID-19) pandemic throughout 2021, we aimed to assess for continued implications of the altered healthcare landscape on non-small cell lung cancer (NSCLC) presentation and treatment in the second year of the pandemic. Methods: This was a retrospective cohort study using the United States National Cancer Database (2019-2021). Demographic, cancer-related, and treatment variables were compared between patients diagnosed in the pre-pandemic year [2019], pandemic-year-one [2020], and pandemic-year-two [2021]. Multivariate logistic regression was performed to control for the impact of demographics on oncologic variables, and then for the impact of oncologic variables on treatment modalities and outcomes. Results: Of 376,193 NSCLC cases, 135,649 (36.1%) were pre-pandemic, 119,338 (31.7%) were pandemic-year-one, and 121,206 (32.2%) were pandemic-year-two. Compared to the pre-pandemic year, patients diagnosed in pandemic-year-two had risk-adjusted increases in clinical T stage [odds ratio (OR) =1.017; 95% confidence-interval (CI): 1.003-1.031], N stage (OR =1.048; 95% CI: 1.033-1.063), M stage (OR =1.044; 95% CI: 1.028-1.060), and overall stage (OR =1.038; 95% CI: 1.023-1.052). Additionally, compared to the pre-pandemic year, patients diagnosed in pandemic-year-two continue to see risk-adjusted increases in time from diagnosis to staging (OR =1.044; 95% CI: 1.017-1.072), to first treatment (OR =1.143; 95% CI: 1.133-1.154), to surgery (OR =1.117; 95% CI: 1.093-1.141) and to systemic therapy (OR =1.021; 95% CI: 1.924-1.039). Conclusions: Compared to the pre-pandemic year, patients diagnosed with NSCLC in the United States during pandemic-year-two continue to present at later clinical stage and experience delays to treatment. The oncologic and treatment characteristics of NSCLC have not returned to pre-pandemic baseline in the United States, possibly due to compounding delays to diagnosis and treatment and a growing back log of cases.

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