<qa>  What is the distance from the tumor lower edge to anal more than 12cm?1. Resectable liver metastasis from colorectal cancerthe distance from the tumor lower edge to anal more than 12cm,no visible extrahepatic metastatic tumors. Curable by resection, as determined by a surgeon and imaging physicians. The minimum of the liver metastases needs 2cm. Patients can be recruited if meet the conditions about: 