The goal of this study is to evaualte the impact of tumor size and microvascular invasion among patients with solitary hepatocellualr carcinoma and post operation. The main questions it aims to answer are: Does the tumor size have more impact on the survival and recurrence than microvascular invasion among solitary operable hepatocellular carcinoma patients? Researchers will retrospectively analyze the prospectively collected clinical database during January 2022 and December 2019 to see whether tumor size more than 6.5 cm or microvascular invasion. The solitary operable hepatocellular carcinoma patients would be classified based on the status of microvascular invasion and tumor size, and the outcome would be evaluated among different sub-populations of the feasible subjects.