Importance: While the characteristics of COVID-19 infection and mortality among patients with a malignant neoplasm have previously been examined, little data are available for gender-specific COVID-19 mortality.
Objective: To examine the gender-specific COVID-19 case fatality risks among patients with a malignant neoplasm.
Design, setting, and participants: In this cohort study using the Healthcare Cost and Utilization Project's National Inpatient Sample, patients admitted to the hospital from April to December 2020 with a diagnosis of COVID-19 infection were identified by the World Health Organization's International Statistical Classification of Diseases and Related Health Problems, Tenth Revision code U07.1. Data analysis was performed from November 2022 to January 2023.
Exposure: Diagnosis of malignant neoplasm, identified and classified according to the National Cancer Institute's definition.
Main outcome and measure: COVID-19 in-hospital case fatality rate, defined as the number of deaths that occurred during index hospital admissions.
Results: There were 1 622 755 patients who were admitted to the hospital from April 1 to December 31, 2020, with a diagnosis of COVID-19. The cohort-level COVID-19 in-hospital case fatality rate was 12.9% with a median time to death of 5 days (IQR, 2-11 days). Frequently reported morbidities among the patients with COVID-19 included pneumonia (74.3%), respiratory failure (52.9%), cardiac arrythmia or cardiac arrest (29.3%), acute kidney injury (28.0%), sepsis (24.6%), shock (8.6%), cerebrovascular accident (5.2%), and venous thromboembolism or pulmonary embolism (5.0%). In a multivariable analysis, gender (male vs female, 14.5% vs 11.2%; adjusted odds ratio [aOR], 1.28; 95% CI, 1.27-1.30) and malignant neoplasm (17.9% vs 12.7%; aOR, 1.29; 95% CI, 1.27-1.32) were both associated with increased COVID-19 in-hospital case fatality risk at the cohort level. Among the group of female patients, there were 5 malignant neoplasms in which the COVID-19 in-hospital case fatality risk was greater than 2-fold higher. These included anal cancer (23.8%; aOR, 2.94; 95% CI, 1.84-4.69), Hodgkin lymphoma (19.5%; aOR, 2.79; 95% CI, 1.90-4.08), non-Hodgkin lymphoma (22.4%; aOR, 2.23; 95% CI, 2.02-2.47), lung cancer (24.3%; aOR, 2.21; 95% CI, 2.03-2.39), and ovarian cancer (19.4%; aOR, 2.15; 95% CI, 1.79-2.59). Among the group of male patients, Kaposi sarcoma (33.3%; aOR, 2.08; 95% CI, 1.18-3.66) and malignant neoplasm in the small intestine (28.6%; aOR, 2.04; 95% CI, 1.18-3.53) had a greater than 2-fold increased COVID-19 in-hospital case mortality risk.
Conclusions and relevance: The results of this cohort study confirmed the substantial case fatality rate among patients with COVID-19 in the early pandemic experience in 2020 in the US. While COVID-19 in-hospital case fatality risks were lower among women compared with men, the associations of a concurrent malignant neoplasm with the COVID-19 case fatality were overall more substantial for women than for men.