from PART III - ORGAN-SPECIFIC CANCERS
Published online by Cambridge University Press: 18 May 2010
Liver metastases from colorectal cancer is a suitable clinical model for regional drug delivery for several reasons: as a result of portal venous drainage, the liver can be the first and only site of metastatic disease in patients with colorectal cancer (1). This is in contrast with other gastrointestinal malignancies, in which liver metastases are frequently a marker of widespread disease, as is the case of gastric cancer and pancreatic cancer (2). In addition, colon cancer has favorable tumor biology compared with other gastrointestinal or non-gastrointestinal malignancies. When liver resections were performed under the same criteria for liver metastases from colon cancer and from gastric cancer, 5-year overall survival was 30% for colon cancer patients and 0% for gastric cancer patients (3). Furthermore, the hepatic artery (HA) is the main blood supply of liver metastases (4). Totally implantable infusion systems have been developed (5), and the surgical techniques have improved (5), allowing a higher percentage of patients to receive regional treatment for longer periods of time.
Identification of ideal candidates is critical for optimal clinical results. Selection criteria focus on identifying patients with liver-only metastatic disease, with suitable hepatic arterial anatomy for pump placement. For this purpose, work-up should include computed tomography scan of the chest, abdomen and pelvis with liver angiography. Positron emission tomographic scans are not routinely performed, but they can be helpful in determining the nature of enlarged periportal lymph nodes or other indeterminate lesions (6).
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