|Year : 2015 | Volume
| Issue : 1 | Page : 11-17
|Surgical Treatment for Hepatocellular Carcinoma
Ahmad A Madkhali1, Zahir T Fadel2, Murad M Aljiffry3, Mazen M Hassanain4
1 Department of Surgery, College of Medicine, King Saud University, Riyadh, Saudi Arabia; Section of Hepatopancreatobilairy and Transplant, Transplant, McGill University, Montreal, Canada
2 Section of Hepatopancreatobilairy and Transplant, Transplant, McGill University, Montreal, Canada; Department of Surgery, Faculty of Medicine, King Abdulaziz University, Jeddah, Saudi Arabia
3 Department of Surgery, Faculty of Medicine, King Abdulaziz University, Jeddah, Saudi Arabia
4 Department of Surgery, College of Medicine, King Saud University, Riyadh, Saudi Arabia; Department of Oncology, McGill University, Montreal, Canada
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|Date of Submission||28-Feb-2014|
|Date of Acceptance||26-Apr-2014|
|Date of Web Publication||11-Feb-2015|
| Abstract|| |
Hepatocellular carcinoma (HCC) is an epithelial tumor derived from hepatocytes; it accounts for 80% of all primary liver cancers and ranks globally as the fourth leading cause of cancer-related deaths. HCC treatment is a multidisciplinary and a multimodal task, with surgery in the form of liver resection and liver transplantation (LT) representing the only potentially curative modality. However, there are variable opinions and discussions about applying these surgical options and using other supporting treatments. This article is a narrative review that includes articles published from 1984 to 2013 located by searching scientific databases such as PubMed, SCOPUS, and Elsevier, with the main keyword of hepatocellular carcinoma in addition to other keywords such as liver transplantation, liver resection, transarterial chemoembolization, portal vein embolization, bridging therapy, and downstaging. In this review, we focus mainly on the surgical treatment options offered for HCC, in order to illustrate the current relevant data available in the literature to help in applying these surgical options and to use other supporting treatment modalities when appropriate.
Keywords: Bridging therapy, downsizing, hepatocellular carcinoma, liver, liver malignant tumor, liver transplantation, liver resection, transarterial chemoembolization
|How to cite this article:|
Madkhali AA, Fadel ZT, Aljiffry MM, Hassanain MM. Surgical Treatment for Hepatocellular Carcinoma. Saudi J Gastroenterol 2015;21:11-7
Hepatocellular carcinoma (HCC), an epithelial tumor derived from hepatocytes, accounts for 80% of all primary liver cancers and ranks globally as the fourth leading cause of cancer-related deaths. Annual mortality rates of HCC remain comparable to its yearly incidence, making it one of the most lethal varieties of solid-organ cancers.  HCC treatment is a multidisciplinary and a multimodal task [Table 1], with surgery in the form of liver resection or liver transplantation (LT) representing the only potentially curative modality.  This article focuses on the surgical management of HCC.
| Materials and methods|| |
This study is a narrative review in which relevant papers, including cross-sectional, cohort, clinical trial, and systematic reviews, were selected using databases and scientific search engines such as PubMed, SCOPUS, and Elsevier, with the main keyword HCC in addition to other keywords such as liver transplantation, liver resection, transarterial chemoembolization, portal vein embolization, bridging therapy, and downsizing. Relevant articles published from the year 1984 up to 2013 were reviewed.
| Discussion|| |
Preoperative evaluation and procedures
The preoperative evaluation for the surgical treatment of HCC should focus on the likelihood of the disease being confined to the liver, and whether the anatomical location of the tumor and the underlying liver function will permit resection.
Determining the extent of tumor involvement
Anatomic delineation of tumor extent is best achieved with dynamic multiphase computed tomography (CT) or magnetic resonance imaging (MRI) scanning. , The typical picture of HCC on a CT scan will appear as an enhanced lesion in the arterial phase [[Figure 1]a] with early washout of the contrast in the venous phase [[Figure 1]b]. Lymph node metastases are uncommon overall (between 1% and 8%), but their presence portends a worse outcome. Preoperative detection of nodal metastases is limited by the frequent presence of benign nodal enlargement in patients with cirrhosis.  Highly suspicious nodes based on enhancement similar to the intrahepatic HCC lesions indicate the need for biopsy in a patient being considered for resection.  Furthermore, chest CT is currently recommended to complete the staging evaluation as well as bone scan if suspicious bone pain or hypercalcemia are present. 
|Figure 1: (a) Enhanced HCC lesion in the arterial phase of a CT scan (b) Early washout of contrast in the venous phase|
Click here to view
Assessment of hepatic reserve
Operative mortality is related to the severity of the underlying liver disease; it is 7%-25% in cirrhotic and less than 3% in noncirrhotic patients.  In patients with cirrhosis, surgical resection is most safely performed in those with Child-Pugh class A disease, who has a normal bilirubin and well-preserved liver function [Table 2]. However, even Child-Pugh class A patients may develop rapid hepatic decompensation following surgery due to limited functional hepatic reserve.  Although helpful, the Child-Pugh classification and other tools for assessing underlying liver disease, such as the model for end-stage liver disease (MELD) score [Table 3], are not adequate to select patients with sufficient hepatic reserve for major resection.  Multiple studies have demonstrated that a normal serum bilirubin level and the absence of clinically significant portal hypertension (i.e. hepatic venous pressure gradient less than 10 mmHg) are the best available indicators of acceptably low risk of postoperative liver failure after liver resection. ,, In many centers, the Child-Pugh score may be supplemented by specialized investigations such as the indocyaninegreen (ICG) retention test, especially in marginal cases (e.g. Child-Pugh B, possible mild portal hypertension).  ICG retention of 14% at 15 min is frequently accepted, mostly in the Asia-Pacific area, as a reflection of adequate functional reserves for major resection (defined as resection of more than two Couinaud segments). ,, The assessment of the volume and function of residual liver should also be addressed by hepatic volumetry, particularly because portal vein embolization (PVE) can be a valuable tool to increase the liver remnant volume prior to major hepatic resection, particularly for right -sided tumors.
Portal vein embolization
Preoperative PVE is a valuable adjunct to major liver resection. PVE can initiate hypertrophy of the anticipated future liver remnant to enable an extended resection in a patient with normal liver or major resection in a well-compensated cirrhotic patient that would otherwise leave a remnant liver insufficient to support life following liver resection. ,,
The potential benefits to the use of PVE are as follows:
The absence of compensatory hypertrophy identifies patient with impaired liver regeneration. Therefore, decreasing the incidence of post-liver resection failure in these patients by avoiding major liver resections.
- Reduction in postoperative morbidity and mortality, ,
- Conversion of unresectable tumor to insufficient future liver remnant to become resectable for potential cure
- Subclinical disease or rapid progression may be detected prior to definitive surgery on postembolization imaging studies, thus sparing the patient an unnecessary operation. ,
Transarterial chemoembolization (TACE) has been proposed as a complementary procedure prior to PVE in patients with HCC. TACE not only eliminates the arterial blood supply to the tumor, but it also embolizes potential arterioportal shunts in cirrhotic livers that attenuate the effects of PVE.  Most surgeons reserve the "double embolization" procedure for HCC patients with liver disease requiring right hepatectomy. ,
Liver resection versus transplantation
Surgical treatment is the only potentially curable option for patients with HCC. Although surgical resection is the treatment of choice in patients with good hepatic function, it is contraindicated in those with moderate-to-severe cirrhosis (Child class B or C), leaving these patients with liver transplantation as the only option. Moreover, transplantation is the optimal treatment even for small, otherwise resectable disease. This is a reflection of a number of factors. Liver transplantation will most likely result in a microscopically negative resection, which is the most effective oncologic treatment. Most HCCs are multifocal especially in the background of cirrhosis, although preneoplastic lesions may not be visible on perioperative evaluation; they are likely to continue to evolve into new primary HCCs. Furthermore, transplantation eliminates cirrhosis and restores normal hepatic function. However, limited organ availability mandates the restriction of liver transplantation to patients with early-stage tumors, which are not candidates for resection.  The debate regarding the best curative option for early HCC in a cirrhotic liver continues.  In a study by Adam et al, involving 198 patients with early HCC with liver cirrhosis, who underwent liver resection (97 patients) or liver transplantation (101 patients). The results have shown that liver transplantation has better overall survival (OS) and recurrence-free survival (RFS) than liver resection in 3, 5, and 10 years (OS, P = 0.008; RFS, P < 0.0001) in tumor size 5 cm or less and similar five 5-year OS after resection and liver transplantation (70% vs. 78%, respectively) in tumor size less than 3 cm, although RFS was better with liver transplantation.  On the other hand, Rahman et al. have shown in a meta-analysis comparing liver resection with liver transplantation in early HCC patients with liver cirrhosis, 1-year OS was significantly higher in patients undergoing liver resection, 5-year OS was comparable for both groups, and 10-year OS was significantly higher in transplanted patients.  The question still remains whether surgical resection and liver transplantation should be considered as alternatives, complimentary, or sequential options in the treatment strategy of HCC. Hence, the decision whether to transplant or resect should be individualized to the patient, institute facility, and waiting list time for transplant.
Liver resection is considered a potentially curative therapy for patients with early-stage HCC (solitary tumor ≤5 cm in size, or three or less tumors each ≤3 cm in size and no evidence of gross vascular invasion) in a Child-Pugh class A score and no evidence of portal hypertension (although a minor resection could be considered in some patients with portal hypertension) , [Table 4]. However, in highly selected cases, patients with a Child-Pugh class B score may be considered for limited liver resection, particularly if liver function tests were normal and no portal hypertension was evident.  There is no general rule regarding tumor size for selection of patients for resection. Certainly, patients with smaller tumors are less likely to harbor occult vascular invasion and have a better outcome after therapy.  However, patients with a solitary HCC without vascular invasion have a similar survival probability regardless of the tumor size.  Nevertheless, the presence of macro or microscopic vascular invasion is considered to be a strong predictor of HCC recurrence. , Hepatic resection is controversial in patients with limited and resectable multifocal disease and/or signs of major vascular invasion. , Multifocality is associated with lower survival, but does not exclude a good outcome in selected patients. In several studies, resection of multifocal HCC was associated with 5-year survival rates of approximately 24%.  Patients with multifocal HCC who appear to benefit from resection are those with sufficient liver reserve to tolerate resection, without extrahepatic disease and without major vascular invasion. Liver resection in patients with major vascular invasion should only be performed in highly selected situations by experienced teams. Owing to the high recurrence rate after surgery, it has been proposed that aggressive surgical liver resection with extended lymphadenectomy should be considered for patients with fibrolamellar HCC and the presence of advanced-stage disease. Invasion of tumor to adjacent organs or local lymph node spread, or limited distant metastasis should not be considered as contraindications for curative resection in patients with fibrolamellar HCC. , Laparoscopy and intraoperative ultrasound (IOUS) may improve the selection of patients for potentially curative resection. IOUS can accurately determine the size of the primary tumor and detect portal or hepatic vein involvement, which precludes curative resection. Another benefit of IOUS is the identification of major intrahepatic vascular structures, which can be used to guide segmental or nonanatomic resections.  In noncirrhotic livers, an anatomical resection should be performed. Up to two-thirds of the functional parenchyma can be removed safely depending on the age of the patient and his liver regenerative capacity. For cirrhotic patients, the resection needs to remove the least amount of nonmalignant parenchyma possible, because the capacity for liver regeneration is impaired in these patients, to preserve postoperative liver function. Both anatomic and wedge resection are acceptable, although some studies suggest portal-oriented resections, enabling longer overall and disease-free survival when feasible.  The 30-day postoperative mortality for cirrhotic patients ranges from 14% to 24%, compared with 0.8%-7% for noncirrhotic patients. ,, Intraoperative blood loss of more than 1500 mL and postoperative infection of any type are important factors affecting the development of postoperative liver failure in cirrhotic patients. , Appropriate selection of patients, meticulous surgical technique, use of low CVP (less than 5 mmHg) anesthesia and inclusion of preoperative volumetry with PVE when appropriate are important factors that have to be considered in order to decrease the rate of morbidity and mortality.
HCC is closely associated with chronic liver disease and cirrhotic livers. Although liver resection and local ablation are regarded as potentially curative treatments, the limited functional reserve of the liver restricts their application and there is a high chance of recurrence in the liver remnant.  Liver transplantation is the only treatment that offers a chance of cure for the tumor and the underlying cirrhosis by complete extirpation of both.
In an effort to prioritize liver transplant candidates according to the highest short-term risk of mortality from end-stage cirrhosis, the MELD scoring system was implemented in 2002 [Table 3].  To impart more urgent access to liver transplantation for patients with small HCCs, additional points within the scoring system were allotted to these patients. This is done to equilibrate their risk of death in comparison with the mortality of end-stage cirrhosis.  Using the American Liver Tumour Study Group Modified TNM staging system, the current UNOS guidelines do not allow upgrading of candidates with Stage I disease, irrespective of biopsy confirmation; only candidates with Stage II HCC disease are upgraded on the waiting list to an MELD score of 22 (equivalent to a 15% probability of candidate death within 3 months) with the intent to shorten their waiting time. From 2002 to 2007 in UNOS database, patients with a "HCC MELD-exception" had similar survival to patients without HCC. 
Criteria for transplantation
"Milan criteria" has achieved favorable results in patients with cirrhosis [Table 5]  with a 5-year survival of these early-stage patients exceeding 70%. Several groups reported a 5-year survival of more than 50% in patients transplanted for HCC beyond Milan,  in whom there were no macroscopic evidence of vascular invasion or extrahepatic spread, which many investigators have argued that it is the minimum acceptable survival rate. In 2001, Yao and colleagues at the University of California, San Francisco (UCSF), defined an expanded set of HCC criteria [Table 5], for which 1-year and 5-year survival rates after LT were 90% and 75%, respectively.  Although, liver transplantation in such candidates is controversial, it is still widely adopted. The short-term outcomes are similar to those who are transplanted within the Milan criteria. The Edmonton group studied the total tumor volume (TTV) in patients with HCC who had liver transplant based on the Milan or UCSF criteria in three centers and they found that TTV < 115 cm 3 has lower recurrence rate than TTV > 115 cm 3 . In the same study, they also found that patients beyond the Milan criteria but within TTV < 115 cm 3 had survivals similar to those of patients within the Milan criteria. On the contrary, patients with TTV > 115 cm 3 demonstrated lower survival than those within TTV < 115 cm 3 when pathology (5 year: 47% vs. 79%, P < 0.001) and radiology staging (5 year: 53% vs. 76%, P < 0.1) were used. 
Pretransplant treatment of HCC
The major limitation for liver transplantation as therapy for early-stage HCC is the insufficient number of donor livers. There is always a waiting period between candidate listing and transplantation. If the waiting period extends over a sufficient length of time, the tumor will grow and eventually hinder transplantation. In a study by Yao and colleagues on patients with HCC listed for transplantation, a 6-month waiting period for liver transplantation was associated with a 7.2% cumulative dropout probability, increasing to 37.8% and 55.1% at 12 and 18 months, respectively.  In this setting, the treatment of HCC prior to liver transplantation has three potential goals: (1) Controlling tumor growth and vascular invasion during the waiting time and therefore decrease dropouts from the waiting list; (2) carrying out neoadjuvant therapy to improve the post-transplant outcome by reducing the risk of postoperative recurrence, and (3) downsizing the HCC burden to make a patient eligible for transplantation. Follow up for patients on the waiting list is required every 3 months by CT or MRI and serum AFP to ensure continued eligibility for liver transplantation. 
Bridge therapy is used to decrease tumor progression and the dropout rate from the liver transplantation waiting list.  It is considered for patients who meet the transplant criteria. A number of studies have investigated the role of locoregional treatment, surgical resection, and sorafenib as a bridge to liver transplantation in patients on a waiting list. ,,,,, However, due to the limitations of these studies and the heterogeneous nature of the study populations, as well as the absence of randomized clinical trials evaluating the utility of bridge therapy for reducing the liver transplantation waiting list dropout rate, the conclusions that can be drawn are limited.  Therefore, locoregional therapy in patients with T2 (one nodule 2-5 cm or three or fewer nodules each ≤3 cm) HCC (Milan criteria) and a likely waiting time of longer than 6 months, may be appropriate.  In fact, patients with anticipated prolonged waiting time are encouraged to have a trial of TACE and/or ablation as bridging therapy to decrease the dropout of transplantation.
Downsizing is done using HCC-directed therapy that aims to reduce and/or number of HCC lesions. Several studies showed successful downsizing with different modalities of treatments and some of them have shown similar survival in patients who initially met the criteria for transplantation. Although such studies have used different selection criteria for downsizing and different transplant criteria, transplantation may be considered after successful downsizing. 
Immunosuppression is used post-liver transplantation to reduce the risk of graft rejection but some immunosuppressant agents used in HCC, such as cyclosporine and tacrolimus, have been associated with a risk of tumor regrowth and recurrence. Thus, minimizing the effective dose is extremely significant. ,, On the other hand, the calcineurin-independent immunosuppressive agent sirolimus, a binder of mTOR, inhibits tumor growth in cell lines; it inhibits primary and metastatic tumor growth in vivo. Furthermore, the benefits of sirolimus-based immunosuppression post-LT for HCC have been explored in a meta-analysis. The study showed improved patient outcomes with lower recurrence rates and significantly improved 1-, 3-, and 5-year RFS and OS.  Nevertheless, randomized trials would provide further understanding of the effect of sirolimus post-LT for HCC and will help directing future studies in the field.
Long-Term outcomes of HCC
The long-term outcome after liver resection is determined by pathologic tumor factors and the underlying liver disease.
The most important tumor-related prognostic factors are the presence and the degree of vascular invasion, tumor number and size, and the status of the surgical margins. Other poor prognostic indicators to be considered are the absence of a tumor capsule, preoperative alpha-fetoprotein (AFP) levels >10,000 ng/mL, and poor histologic grade of differentiation. 
Underlying liver disease
Preoperative underlying liver disease and cirrhosis are considered important negative prognostic factors. Early recurrence after resection of HCC was found to be related to liver cirrhosis, hepatitis B/C, Child-Pugh score, transaminase level, albumin level, and chronic active hepatitis.  A few reports pointed out that chronic active hepatitis and cirrhosis are the most significant risk factors for intrahepatic recurrence through multicentric carcinogenesis, the so-called multicentric occurrence. ,
Although there is no consensus as to the optimal approach for post-transplant surveillance as well, recommendations are based on the consensus that earlier identification of disease may facilitate patient eligibility for investigational studies or other forms of treatment. The Guidelines from the National Comprehensive Cancer Network (NCCN) recommends high-quality cross-sectional imaging every 3-6 months for 2 years, then every 6-12 months. AFP levels, if initially elevated, should be measured every 3 months for 2 years, then every 6-12 months. Re-evaluation according to the initial workup should be considered in the event of disease recurrence. 
Partial hepatectomy (i.e. liver resection) is a potentially curative therapy for patients with early-stage HCC. The 5-year survival rates are over 50% for patients who had liver resection for HCC.  Other studies additionally suggested that for selected patients with preserved liver function and early stages of HCC, liver resection can achieve a 5-year survival rate of approximately 70%.  However, HCC tumor recurrence rates at 5 years following liver resection have been reported to exceed 70%.  Thus, appropriate surveillance should be considered. However, there are clear survival benefits and low recurrence rates after transplantation for HCC. When surgeons adhere to the Milan criteria, 5-year survival rates after transplantation range from 70% to 80%, and tumor recurrence rates are approximately 10%. Furthermore, UCLA Transplant Centre has reported that OS at 1, 3, and 5 years was 82%, 65%, and 52%, respectively. Patients meeting Milan criteria had similar 5-year post-transplant survival to patients meeting UCSF criteria by both preoperative imaging and explant pathology. However, beyond the UCSF criteria the 5-year survival was significantly lower (<50%).  Hence, OS is significantly reflected by the proper selection of transplant candidates.
| Summary|| |
HCC management is a multidisciplinary and a multimodal task with the surgical treatments representing the only potentially curative modalities available today. Liver resection and liver transplantation are the two offered surgical options for HCC treatment. To apply the best option, careful selection of patients is required. Accurate diagnosis and proper evaluation, including the extent of the disease and the status of the hepatic reserve, are essential elements to determine the treatment strategy.
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Mazen M Hassanain
Assistant Professor of Surgery and Consultant HPB and Transplant Surgery, Department of Surgery, College of Medicine, Scientific Director Liver Disease Research Centre, King Saud University, P.O.Box 25179, Riyadh, 11466
Source of Support: None, Conflict of Interest: None
[Table 1], [Table 2], [Table 3], [Table 4], [Table 5]
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