Edmondson-steiner grading increases the predictive efficiency of TNM staging for long-term survival of patients with hepatocellular carcinoma after curative resection

Background The 6th edition TNM staging (TNM-6) for hepatocellular carcinoma (HCC) has been recommended. However, its superiority, in contrast to the previous 5th edition (TNM-5), has not been fully recognized. Besides, tumor differentiation was not included. The current study was designed to compare the value of these two staging systems and, more importantly, to elucidate whether Edmondson-Steiner grading, a well-acknowledged histological classification, is helpful in further discriminating different prognosis of HCC. Methods Prospectively collected clinicopathological and follow-up data of consecutive 171 patients with HCC undergoing curative hepatic resection (CHR) were reviewed retrospectively. The impacts of variables on survival were determined by univariate and multivariate statistical analyses. Results The differences of survival between stages of the TNM-6 and TNM-5 were almost significant, except for disease-free survival for TNM-5. Moreover, TNM-6 might be a more powerful prognostic predictor compared with TNM-5, although their impacts on survival were all not independent, unlike Edmondson-Steiner grading. For patients with each stage of TNM-6, Edmondson-Steiner grade was the sole significant variable in both univariate and multivariate analyses. Finally, a novel scoring criteria (prognostic scoring for CHR, PSCHR) integrating Edmondson-Steiner grading and TNM-6 was attempted and statistically shown to be of independent significance and stronger predicting value for prognosis of curatively resected HCC. Conclusion TNM-6 revealed to be more significantly prognostic than TNM-5 in patients with HCC after curative hepatic resection. Edmondson-Steiner grading could raise the predictive efficiency of TNM-6 for postresectional survival of patients with HCC. Therefore, PSCHR containing Edmondson-Steiner grading was preliminarily proposed.