Introduction: Venous thromboembolism (VTE) is associated with significant morbidity and mortality in cancer patients. Our study compares the mortality in hospitalized VTE patients among the four most common Gastrointestinal (GI) malignancies which includes esophageal, gastric, pancreatic, colorectal cancer.
Methods: A retrospective study was conducted utilizing the Nationwide Inpatient Sample database (NIS) from 2016 to 2019. Patients with Venous thromboembolism (VTE) were identified using ICD-10 codes from all primary discharge diagnoses. Only deep venous thrombosis (DVT) and pulmonary embolism (PE) were considered. Patients with VTE were further divided into groups: esophageal cancer, gastric cancer, pancreatic cancer, colorectal cancer, and compared with patients who did not have these malignancies. Adjusted odds ratio (aOR) was calculated using multivariate regression analysis.
Results: Among 999,559 patients discharged with a VTE diagnosis, 25,775 (2.6%) had one of the four GI malignancies. Among patients with one of the four included GI malignancy diagnosis, 18,816 (73%) patients had PE and 6,959 (27%) patients had DVT. The study shows that adults admitted to the hospitals for VTE have higher mortality when compared to patients who did not have GI malignancies, with esophageal cancer having the highest inpatient mortality with an aOR of 2.701; 95% Confidence interval (CI) 1.989-3.669, P-value < 0.000. For the remaining GI cancers, gastric cancer had an aOR 1.576; CI 1.094-2.269, P-value 0.015, pancreatic cancer had an aOR of 1.736; 95% CI 1.445-2.085, P-value < 0.000). Patients with colorectal cancer had no significant increase in the odds of mortality with aOR of 1.213; 95% CI 0.988-1.489, P-value 0.066.
Conclusions: This study demonstrates that VTE in hospitalized patients with esophageal cancer is associated with greater mortality compared to other GI malignancies.