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A total of 15 covariates were selected for analysis in this study, namely age, marital status, gender, race, AFP, radiotherapy, chemotherapy, systemic therapy, surgery, T stage, N stage, M stage, AJCC stage, tumor size and histologic grade. All patients were staged according to AJCC 8th edition. 
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A total of 15 covariates were selected for analysis in this study, namely age, marital status, gender, race, AFP, radiotherapy, chemotherapy, systemic therapy, surgery, T stage, N stage, M stage, AJCC stage, tumor size and histologic grade. All patients were staged according to AJCC 8th edition. 
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The patients were categorized into three groups based on the RX Summ–Surg Prim Site (1998+) field. These groups include: 
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The patients were categorized into three groups based on the RX Summ–Surg Prim Site (1998+) field. These groups include: 
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*(1) absence of surgery (A000); 
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(1) absence of surgery (A000); 
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*(2) local destruction of tumor (A100-A170); 
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(2) local destruction of tumor (A100-A170); 
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* (3) liver resection or liver transplantation (A200-A750).
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(3) liver resection or liver transplantation (A200-A750).