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Down-regulation of RASA1 Is Associated with Poor Prognosis in Human Hepatocellular Carcinoma
Yao-Li Chen1,2,3, Wei-Chieh Huang4, Hsin-Lei Yao5
1School of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan, R.O.C.
Background/Aim:
RASA1 (p120RasGAP), encodes Ras GTPase-activating protein 1 and, is a potent tumor suppressor gene that is frequently inactivated in several human cancer types. However, its precise role in hepatocellular carcinoma (HCC) has been blurred.
Materials And Methods:
We hypothesized that RASA1 plays a crucial role in tumor pathogenesis and progression of HCC. RASA1 expression levels were analyzed in 226 cases of HCC by immunohistochemistry.
Results:
It was found that 38.68% (41/106) of the high-grade HCC samples and 54.17% (65/120) of the low-grade HCC samples expressed RASA1 protein. The difference between RASA1 expression in high-grade and low-grade HCC was statistically significant (p=0.02). Additionally, RASA1 high expression was inversely associated with larger tumor size (p<0.001). Although RASA1 is known as a tumor suppressor, its role in overall survival (OS) in HCC is unclear. Kaplan-Meier survival analysis showed that patients with low level of RASA1 expression correlated with a significantly poorer survival compared to those with high level of RASA1 expression.
Conclusion:
These data support that RASA1 could serve as an independent prognostic marker for HCC patients.
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