This trial is designed for patients with metastatic colorectal carcinoma (CRC), who have undergone a complete resection of their primary tumor and recent resection of their liver metastases (R0 or R1) with curative intent. No generally accepted standard care is available following curative-intent resection of hepatic metastases in colorectal cancer patients. L-BLP25 is a cancer vaccine that targets MUC1, a well known tumor-associated antigen. Recently, it has been shown that MUC1 is associated with cellular transformation as demonstrated by tumorigenicity and can confer resistance to genotoxic agents. High levels of MUC1 cell surface expression, reported immunosuppressive activities of its released ectodomain, and anti-adhesive properties all contribute to the ability of the MUC1 antigen to protect and promote tumor cell growth and survival, and make MUC1 an attractive target for cancer immunotherapy.