Demographics, Prognostic Factors, and Survival Outcomes in Hepatic Angiosarcoma: A Retrospective Analysis.

Background: Hepatic angiosarcoma (HA) is a rare malignant vascular neoplasm. Currently, there are no standardized protocols for treating HA. This study aims to understand clinicopathologic analysis, prognostic factors, and treatment outcomes comprehensively.

Methods: The data retrieved from the SEER database was reviewed for hepatic angiosarcoma cases between 2000 and 2021.

Results: A total of 389 patients with hepatic angiosarcoma were identified with a mean age of 63.9 years (SD ± 16). Most patients were male (64%), and per US census data, non-Hispanic Asians or Pacific Islanders were the most common race (17%). In known cases of tumor stage (61%), the most common tumor stage was distant (22%), and most were grade III (18%) tumors. Overall, the 3-year survival rate was 6.7% with a 95% confidence interval (95% CI 0.044-0.100), disease-specific survival at a 1-year survival rate was 4.43% (95% CI 0.023-0.083), and no patients survived by 3 years. The best overall survival rate was the 1-year rate for surgical resection, 18.20% (95% CI 0.075-0.441). Chemotherapy had a 1-year survival rate of 11% (95% CI 0.057-0.211), and radiation therapy had no survival significance (p = 0.2). Multivariate analysis shows age above 70 years (H.R. 1.67 (95% CI 1.181-2.381), p < 0.05), no surgical intervention (H.R. 2.29 (95% CI 1.585-3.336) p < 0.001), and distant stage (H.R. 2.54 (95% CI 1.696-3.805) p < 0.001) are negative prognostic factors, whereas female sex (H.R. 0.68 (95% CI 0.536-0.875) p < 0.05) is a positive prognostic factor.

Conclusion: Increasing age (> 70 years), male sex, and distant stage were found to be strong predictors of poor survival outcomes. Patients had better outcomes when surgical resection and chemotherapy were included in their treatment. These results can provide continued evidence in the future management of patients with hepatic angiosarcoma.