Validation of the Modified Tnm-Izumi Classification for Hepatocellular Carcinoma

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Abstract
Aims and background: The clinical value of the UICC TNM classification and the Izumi TNM modification regarding prognosis after hepatic resection was evaluated. Methods: Between January 1993 and December 1998, survival and disease-free survival were analyzed in 53 cirrhotic patients (40 males, 13 females; mean age, 65 years; range, 43-81) who underwent hepatic resection for HCC. Results: The 1-, 3-, and 5-year overall survivals were: 89%, 54%, and 50%, with disease-free survivals of 70%, 38%, and 28%, respectively. The difference between stages 1 and 2 or stages 3 and 4A using the UICC TNM classification was not significant with respect to survival or disease-free survival. Conversely, the Izumi TNM modification showed a significant difference between each stage with respect to survival and disease-free survival. In a multivariate analysis the lack of micro/macro vascular invasion was predictive of long-term outcome. Conclusions: Our results show that the UICC TNM classification for hepatocellular carcinoma is inadequate. The Izumi modified TNM staging system is superior in assessing prognosis for surgical HCC patients.