BACKGROUND
Leiomyosarcoma is a rare neoplasm of smooth muscle that can originate from various organ systems. Of the gastrointestinal tract, the rarity and the difficulty of diagnosing small intestine leiomyosarcoma affect its poor prognosis. With an average age of diagnosis of 64 years and a median life expectancy of 45 months, there exists a lack of information on the disparities that exist in these patients and how patient demographics contribute to differences in survival outcomes.
METHODS
We used the National Cancer Database to identify patients diagnosed with small intestine leiomyosarcoma (ICD-O-3 histology code 8890) between 2004-2019 (N=406). General patient characteristics were assessed using descriptive statistics. Survival was evaluated using Kaplan-Meier curves and log-rank tests. Significance was set at p<0.05.
RESULTS
When analyzing race, patients diagnosed with small intestine leiomyosarcoma were predominantly White (81.8%) and African American (14.3%); however, White patients had statistically worse survival outcomes than African Americans (67 vs 97 months) (p=0.004). Patients with private insurance had statistically better outcomes when compared to Medicare (p<0.001). When compared to White patients, African Americans had a higher proportion of private insurance (53.4% vs 37.2%) and lower proportion of Medicare coverage (5.2% and 48.2%), a lower average age of diagnosis (60.5 vs 64.7 years), shorter travel distances (14.7 vs 31.1 miles) and fewer days between staging procedure and surgical diagnostics from initial diagnosis (4.54 vs 12.5 days). Patients who received surgical intervention had a statistically significant improved survival outcome than those who did not (78 vs 15 months) (p<0.001) with the majority of these procedures being partial gastrectomies (53.6%). More patients of the cohort were treated at comprehensive community cancer programs (36.2%), followed by academic research programs (32.0%), integrated network cancer programs (18.5%) and community cancer programs (8.6%).
CONCLUSIONS
Factors associated with increased survival outcomes include race, average age of diagnosis, travel distance, fewer days between diagnostic procedure and initial diagnosis, insurance status and surgical treatment. These findings make a valuable contribution to the ongoing research on disparities affecting survival in patients with small intestine leiomyosarcoma.