Racial impact of secondary metastasis in patients with lung cancer: Evidence of US hospitals in 2020.

213 Background: Lung cancer patient often encounter disparities in health outcomes, especially in difference racial and ethnic groups. Metastasis is the primary cause of cancer morbidity and mortality. However, data on the metastasis risks and clinical outcomes on hospitalized individuals with lung cancer is still limited. Therefore, we aim to assess the association between metastatic lung cancer and racial differences. Methods: We analyzed the 2020 U.S. National Inpatient Sample (NIS) to explore patients who have lung cancer as the primary diagnosis. Additionally, we identified evidence of metastasis, as recorded by ICD-10-CM. Adjusted odds ratios (aORs) for specified outcomes were calculated through multivariable logistic and linear regression analyses. The primary outcome was racial differences in organ metastasis and secondary outcomes included mortality and length of stay. Statistical significance was established at p-value of 0.05. Results: We identified 103,335 patients with primary diagnosis of lung and bronchus cancer at discharge. The mean age was 68.9 years; 50.5% were female. Caucasians accounted for 74.3%, with African Americans at 12.1% and Hispanics at 4.6%. 10% of the patients had brain metastasis, whereas 14% had bone metastasis. In a multivariate analysis adjusting for patient, COVID-19, chemotherapy usage and hospital factors, African Americans had higher risk of brain metastasis (aOR 1.18; 95%CI (1.02, 1.37), p = 0.002), higher risk of bone metastasis (aOR 1.16; 95%CI (1.02, 1.33), p = 0.025), higher risk of mortality (aOR 1.21; 95% CI (1.01, 1.45), p = 0.039) and longer length of stay (b = 0.85; 95%CI (0.55, 1.16), p = 0.001). Hispanics also had higher risk of brain (aOR 1.36, p < 0.05) and prolonged length of stay (b 0.79, p < 0.005). We observed an increase in risk of metastasis and mortality but non-statistically significant in some parameters and races, as shown in table provided. Conclusions: In conclusion, our study revealed that racial difference is associated with higher risk of metastasis, as well as other outcomes. Further longitudinal research is necessary to establish a causal relationship between races, metastasis, and mortality in patients with lung cancer. [Table: see text]