Purpose: The aim of the present study was to analyze a single-center experience with hepatic arterial infusion (HAI) in patients with unknown or uncertain primary or tumors not usually treated with HAI.

Methods: A retrospective analysis of 14 patients treated between 1996 and 2003 for liver tumors of unknown, uncertain or unusual primary was performed.

Results: All patients were treated with HAI combination regimens based on 5-fluorouracil and folinic acid. The response was not evaluable in most patients, predominantly because of only a single course of therapy could be administered and no cases of partial or complete response were noted. The median survival of all patients was 6.6 months (5-year survival 14%).

Conclusion: The present data demonstrate limited efficacy of HAI in patients with liver tumors of unknown, uncertain or unusual primary. HAI should not be offered to these patients.

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