Liver metastases

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Abstract
Liver metastases, especially from colorectal primary cancers, are treatable and potentially curable. Imaging techniques such as CT, MRI, and sonography have advanced in recent years and led to increased sensitivity and specificity in the diagnosis of liver metastases. Liver surgery also has been revolutionized in the past two decades. Dissections along nonanatomic lines have permitted the resection of multiple lesions that previously might have been considered unresectable. We regard resection of a solitary hepatic metastasis or up to four metastases from colorectal carcinoma as the best treatment for this condition. In patients over 70 years of age and those with medical conditions preventing surgery, we endorse expectant follow-up as long as the tumor remains stable. But if the tumor begins growing rapidly and local techniques cannot be used, we consider systemic chemotherapy. In patients with progressive metastatic liver disease, we initiate systemic therapy or hepatic arterial infusion. In young patients with metastatic disease, even when the disease is indolent or symptomatic, it may be difficult not to treat. We use either local regional therapy (resection or regional infusion) or systemic chemotherapy followed by regional therapy. In patients with neuroendocrine tumors metastatic to the liver, the first approach we use is not to treat because there may be a long period of stable disease. We use Sandostatin (Sandoz Pharmaceuticals, East Hanover, NJ) to treat symptoms. If the tumor progresses and symptoms cannot be controlled, these vascular tumors can be treated by embolization or chemoembolization, with high expectations of response. Newer approaches to liver metastases such as cryosurgery, chemoembolization, and interstitial radiation are also available. Cryosurgery is an ablative procedure that has not been proven yet to be as effective as surgical removal of metastases. However, in a situation where surgery cannot be performed, cryosurgery is an alternative. Chemoembolism has not been proven to be more effective than systemic therapy for liver metastases, but it allows another regional approach. External localized radiation can be used for patients who fail first-line treatment or in new protocols to delineate its value, perhaps in concert with chemotherapy. We also consider offering external localized radiation in patients who fail first-line treatment, perhaps in concert with chemotherapy. The usefulness of these techniques compared with surgery or regional therapy is being investigated.