Microvascular Invasion Is a Better Predictor of Tumor Recurrence and Overall Survival Following Surgical Resection for Hepatocellular Carcinoma Compared to the Milan Criteria

Milan criteria, multi-nodularity, and microvascular invasion predict the recurrence patterns of hepatocellular carcinoma after resection

AIMS

This study aims to evaluate the risk factors for tumor recurrence beyond the Milan criteria (MC) for patients with hepatocellular carcinoma (HCC) after surgical resection (SR) in which salvage liver transplantation is relatively contraindicated.

METHODS

A total of 447 patients who underwent SR for HCC were enrolled consecutively. Among them, 248 and 199 patients were within the Milan criteria and beyond the Milan criteria (BMC group), respectively. Overall survival, recurrence, and disease-free survival were analyzed by multivariate analysis.

RESULTS

After a median follow-up of 34.4 months, 130 patients died. Microvascular invasion, higher Edmondson stage of tumor cell differentiation, BMC group, and no anti-viral therapy were associated with poor overall survival. Multi-nodularity, higher Edmondson stage, BMC group, and no anti-viral therapy were independent risk factors for tumor recurrence, while BMC group and no anti-viral therapy were independent risk factors for disease-free survival. The Milan criteria, multi-nodularity, and microvascular invasion were used to stratify the patients into low-, medium-, and high-risk groups for tumor recurrence outside the MC and showed statistical significance (low vs. medium, p = 0.011; low vs. high, p < 0.001; medium vs. high, p = 0.009).

CONCLUSIONS

The combination of the MC, multi-nodularity, and microvascular invasion predict the post-operative recurrence of HCC and may provide a roadmap for further treatment.

Quantitative proteomic analysis identified paraoxonase 1 as a novel serum biomarker for microvascular invasion in hepatocellular carcinoma

This study aimed to identify serum biomarkers for microvascular invasion (MVI) in hepatocellular carcinoma (HCC). MVI is a histological sign of micrometastasis in the liver and is considered as one of the most powerful prognostic factors in HCC. The serum of HCC patients with different vascular invasion statuses was examined by iTRAQ-based proteomic profiling. The expression levels of 24 proteins were associated with the extent of vascular invasion in the pooled samples of 45 HCC cases. Western blot analyses in 90 HCC cases confirmed the correlation of the expression level of paraoxonase 1 (PON1) with the extent of vascular invasion. ELISA assays demonstrated the diagnostic utility of the PON1 level, with the area under curve values of 0.847 and 0.889 for the MVI and gross vascular invasion, respectively, relative to the patients without vascular invasion, in a cohort of 387 additional HCC cases. Immunohistochemistry revealed that PON1 expression in tumor cells was inversely correlated with the extent of vascular invasion in 200 additional HCC cases. In conclusion, using a proteomic approach, we found that serum PON1 was a novel diagnostic biomarker for MVI. The prognostic values of serum PON1 and its possible therapeutic applications are worth further investigation.

A systematic review of microvascular invasion in hepatocellular carcinoma: diagnostic and prognostic variability

Selected patients with hepatocellular carcinoma are candidates to receive potentially curative treatments, such as hepatic resection or liver transplantation, but nevertheless there is a high risk of tumor recurrence. Microvascular invasion is a histological feature of hepatocellular carcinoma related to aggressive biological behavior. We systematically reviewed 20 observational studies that addressed the prognostic impact of microvascular invasion, either after liver transplantation or resection. Outcomes were disease-free survival and overall survival. In liver transplantation, the presence of microvascular invasion shortened disease-free survival at 3 years (relative risk (RR)=3.41 [2.05-5.7]; five studies, n=651) and overall survival both at 3 years (RR=2.41 [1.72-3.37]; five studies, n=1,938) and 5 years (RR=2.29 [1.85-2.83]; six studies, n=2,003). After liver resection, microvascular invasion impacted disease-free survival at 3 and 5 years (RR=1.82 [1.61-2.07] and RR=1.51 [1.29-1.77]; four studies, n=1,501 for both comparisons). However inter/intraobserver variability in reporting and the lack of definition and grading of microvascular invasion has led to great heterogeneity in evaluating this histological feature in hepatocellular carcinoma. Thus, there is an urgent need to clarify this issue, because determining prognosis and response to therapy have become important in the current management of hepatocellular carcinoma. In this systematic review, we summarize the diagnostic and prognostic data concerning microvascular invasion in hepatocellular carcinoma and present a basis for consensus on its definition.

Prognostic role of C-reactive protein in hepatocellular carcinoma: a systematic review and meta-analysis

BACKGROUND

C-reactive protein (CRP) which used to be a prototypical inflammatory cytokine has been identified involving in the progression of tumor-promoting inflammation. Several studies have indicated that CRP is a predictor for hepatocellular carcinoma (HCC), but the results are controversial.

METHODS

We conducted a systematic review of ten studies (1885 patients) to examine the association of high serum CRP expression with overall survival (OS) and recurrence-free survival (RFS) in HCC patients by meta-analysis. Moreover, the correlation between high serum CRP and tumor clinicopathological parameters was also assessed. Hazard ratio (HR) or odds ratio (OR) with its 95% confidence interval (CI) was used as the effect size estimate.

RESULTS

Our pooled results showed that high expression level of serum CRP (≥ 10 mg/L) was associated with poor OS (HR: 2.15, 95% CI: 1.76-2.63) and RFS (HR: 2.66, 95% CI: 1.54-4.58) in HCC. Serum CRP overexpression (≥ 10 mg/L) was also significantly associated with the presence of tumor vascular invasion (OR: 3.05, 95% CI: 1.79-5.23), multiple tumor (OR: 2.36, 95% CI: 1.36-4.10), larger tumor size (OR: 3.41, 95% CI: 1.04-11.18), and advanced TNM stage (OR: 3.23, 95% CI: 2.29-4.57). In addition, serum CRP overexpression (≥ 10 mg/L) tended to be correlated with poor differentiation (OR: 1.58, 95% CI: 0.74-3.39), though not significantly.

CONCLUSION

The present systematic review and meta-analysis demonstrate that high serum level of CRP (≥ 10 mg/L) denotes a poor prognosis of patients with HCC.

Patients with multiple hepatocellular carcinomas within the UCSF criteria have outcomes after curative resection similar to patients within the BCLC early-stage criteria

BACKGROUND

Surgical strategies for the treatment of multiple hepatocellular carcinomas (HCC) remain controversial. This study compared the prognostic power of the University of California, San Francisco (UCSF) criteria with the Barcelona Clinic Liver Cancer (BCLC) early-stage criteria.

METHODS

Clinical and survival data of 162 multiple-HCC patients in Child-Pugh class A who underwent curative resection were retrospectively reviewed. Prognostic risk factors were analyzed using univariate and multivariate analyses.

RESULTS

UCSF criteria were shown to independently predict overall and disease-free survival. In patients within the UCSF criteria, 3-year overall and disease-free survivals were significantly better than in those exceeding the UCSF criteria (68 vs. 34 % and 54 vs. 26 %, respectively; both p < 0.001). There were no significant differences in 3-year overall and disease-free survival between patients within the UCSF criteria but exceeding the BCLC early stage and patients with BCLC early-stage disease (71 vs. 66 %, p = 0.506 and 57 vs. 50 %, p = 0.666, respectively). Tumors within the UCSF criteria were associated with a lower incidence of high-grade tumor (p = 0.009), microvascular invasion (p = 0.005), 3-month death (p = 0.046), prolonged Pringle's maneuver (p = 0.005), and surgical margin <0.5 cm (p < 0.001) than those exceeding the UCSF criteria. Tumors within the UCSF criteria but exceeding the BCLC early stage had invasiveness and surgical difficulty similar to those within the BCLC early-stage criteria.

CONCLUSIONS

Multiple HCC patients within the UCSF criteria benefit from curative resection. Expansion of curative treatment is justified.

Effect of transcatheter arterial chemoembolization prior to surgical resection for hepatocellular carcinoma

The aim of the present study was to evaluate the influence of preoperative transcatheter arterial chemoembolization (TACE) on survival after surgical resection (SR) for hepatocellular carcinoma (HCC). Two hundred and thirty-five HCC patients who underwent SR with curative intent were analyzed. Overall survival (OS), recurrence-free survival (RFS) and complication rates were compared between the TACE (n=110) and control groups (n=125). Moreover, TACE subjects were classified into TACE responders (n=85) and TACE non-responders (n=25), according to the therapeutic efficacy of pretreatment TACE, and the factors contributing to OS and RFS after SR were analyzed using univariate and multivariate analyses. The 1-, 3- and 5-year OS rates were 87.4, 76.0 and 62.5%, respectively, in the TACE group and 94.9, 79.0 and 57.8%, respectively, in the control group (P=0.674). The corresponding RFS rates at 1, 3 and 5 years were 73.3, 48.9 and 33.2%, respectively, in the TACE group and 73.3, 29.4 and 16.3%, respectively, in the control group (P=0.062). No TACE-related serious adverse events (SAEs) were observed. There were no significant differences between the groups in terms of surgery-related SAEs (P=0.714), operation time (P=0.881), blood loss during surgery (P=0.334) and hospitalization period (P=0.447). Multivariate analyses identified TACE responder, TACE non-responder, total bilirubin ≥1 mg/dl, serum albumin ≥4 g/dl, pretreatment α-fetoprotein (AFP) level ≥100 ng/ml and microscopic vascular invasion as significant prognostic factors linked to OS. TACE non-responder, tumor number (multiple) and pretreatment AFP level ≥100 ng/ml were significant adverse prognostic factors linked to RFS. In conclusion, TACE is a safe procedure in patients with HCC, and the efficacy of TACE prior to surgery may be associated with clinical outcomes after SR.

Preoperative predictors of short-term survival after hepatectomy for multinodular hepatocellular carcinoma

AIM: To investigate preoperative factors associated with poor short-term outcome after resection for multinodular hepatocellular carcinoma (HCC) and to assess the contraindication of patients for surgery.

METHODS: We retrospectively analyzed 162 multinodular HCC patients with Child-Pugh A liver function who underwent surgical resection. The prognostic significance of preoperative factors was investigated by univariate analysis using the log-rank test and by multivariate analysis using the Cox proportional hazards model. Each independent risk factor was then assigned points to construct a scoring model to evaluate the indication for surgical intervention. A receiver operating characteristics (ROC) curve was constructed to assess the predictive ability of this system.

RESULTS: The median overall survival was 38.3 mo (range: 3-80 mo), while the median disease-free survival was 18.6 mo (range: 1-79 mo). The 1-year mortality was 14%. Independent prognostic risk factors of 1-year death included prealbumin < 170 mg/L [hazard ratio (HR): 5.531, P < 0.001], alkaline phosphatase > 129 U/L (HR: 3.252, P = 0.005), α fetoprotein > 20 μg/L (HR: 7.477, P = 0.011), total tumor size > 8 cm (HR: 10.543; P < 0.001), platelet count < 100 × 10⁹/L (HR: 9.937, P < 0.001), and γ-glutamyl transpeptidase > 64 U/L (HR: 3.791, P < 0.001). The scoring model had a strong ability to predict 1-year survival (area under ROC: 0.925, P < 0.001). Patients with a score ≥ 5 had significantly poorer short-term outcome than those with a score < 5 (1-year mortality: 62% vs 5%, P < 0.001; 1-year recurrence rate: 86% vs 33%, P < 0.001). Patients with score ≥ 5 had greater possibility of microvascular invasion (P < 0.001), poor tumor differentiation (P = 0.003), liver cirrhosis with small nodules (P < 0.001), and intraoperative blood transfusion (P = 0.010).

CONCLUSION: A composite preoperative scoring model can be used as an indication of prognosis of HCC patients after surgical resection. Resection should be considered with caution in patients with a score ≥ 5, which indicates a contraindication for surgery.

Resection for hepatocellular carcinoma: is it justifiable to restrict this to the American Association for the Study of the Liver/Barcelona Clinic for Liver Cancer criteria?

Hepatocellular carcinoma (HCC) is an important cancer worldwide. The main curative treatment modality is surgical resection although only a minority of afflicted patients are amendable because of poor liver function reserve or extensive disease at the time of diagnosis. The selection criteria for surgical resection, however, are variable and frequently appear to be center-specific. Further, they are influenced by rapidly evolving data on the outcomes of surgical resection and other emerging modalities of treatment. Recently, two major international practice guidelines on the management of HCC were published at about the same time, namely those of the American Association for the Study of the Liver (AASLD), and of the Asia-Pacific Association for the Study of the Liver (APASL). These two practice guidelines differ significantly in philosophy and practice with regards to surgical resection. In fact, they reflect the two extremes of a spectrum of existing consensus opinions. The AASLD Guidelines have evolved from the guidelines of the Barcelona Clinic for Liver Cancer (BCLC), and are significantly more conservative with regard to surgical resection compared with the APASL Guidelines. The scientific basis for these major differences in criteria with regard to surgical resection for HCC is reviewed here, particularly with regard to the situation in the Asia-Pacific region where HCC is especially common.