The earlier diagnosis, coupled with advances in operative and postoperative management and patient selection have increased survival after hepatectomy for hepatocellular carcinoma (HCC) (1). Survival rates from HCC in the United States have doubled over the past 2 decades (2).
The two most frequently used curative treatments for HCC are surgical resection and orthotopic liver transplantation (OLT) transplantation. In patients with advanced cirrhosis and tumors within transplantation criteria, in the absence of extrahepatic spread and macrovascular invasion, liver transplantation is the gold standard, as it allows treatment of the tumor and the underlying cirrhosis as well. In patients with well-preserved hepatic function (Child-Pugh grade A and early Child-Pugh grade B) and resectable disease, surgical resection is the most appropriate treatment (3-6).
For years, selection of candidates for resection has been based on the Child-Pugh classification, however even Child-Pugh A patients may already have liver functional impairment with clinically significant portal hypertension (7). A normal serum bilirubin level and the absence of clinically significant portal hypertension (i.e., hepatic vein pressure gradient <10 mmHg) appear to predict a low risk of postoperative liver failure after hepatectomy (8). Other researchers have emphasized that the Model of End-Stage Liver Disease (MELD) score (Table 1) can be a useful predictor of postoperative liver failure (11). In Japan, the indocyanine green retention rate is used to identify the best candidates for resection. The hepatocyte clearance of indocyanine green (ICG), an anionic dye, in the bile at 15 minutes is used to evaluate the hepatocyte function (12). A value of 40% retention suggests severe liver dysfunction and prohibits surgical resection (13).
The care of HCC patients was revolutionized after a landmark publication, that established OLT as therapy for HCC patients with cirrhosis, by Mazzaferro et al. (9) in 1996. It showed that patients with up to 3 foci of HCC each less than 3 cm in size or one tumor measuring less than 5 cm, without vascular invasion or extrahepatic spread (known as the “Milan criteria”) experienced a 5-year overall survival rate that was comparable to the survival rates of cirrhotics undergoing transplant without cancer (75%) with recurrence-free survival rate of 83%. Before that, it was known that transplantation was associated with a significant disease free survival for 3 or fewer tumors each within 3 cm compared to resection (14).
Subsequently, researchers in the University of California at San Francisco (UCSF), broadened the criteria to include single tumors measuring less than 6.5 cm or 2-3 tumors, none greater than 4.5 cm in size, with total tumor diameter not greater than 8 cm (Table 1) (10). The initial study revealed no adverse impact on survival (5-year overall survival rate 75%). However it was criticized as the tumor characteristics were obtained at the time of explantation. Subsequently, prospective validation of the UCSF criteria based on preoperative imaging yielded similar results (17). Patients meeting UCSF criteria had similar 5-year survival as patients meeting Milan criteria both by preoperative imaging (18,19).
The MELD score (Table 1), was implemented in 2002 in an effort to quantify liver insufficiency and prioritize patients in waiting lists for OLT according to their mortality risk. Additional points were allotted to patients with HCC to equilibrate their mortality risk in relation to the mortality of end-stage cirrhosis. Patients with at least a solitary lesion that is greater than 2 cm in size are awarded 22 MELD points (20-22), adjusted every 3 months to reflect a 10% increase in mortality.
The UNOS criteria specify that patients eligible for liver transplantation should not be resection candidates. Only candidates with Stage II HCC are upgraded on the waiting list to a MELD score of 22 (equivalent to a 15% probability of candidate death within 3 months) with the intent to shorten their waiting time. An additional point every 3 months is granted based on the 20-50% dropout rate seen at 1 year due to progression of disease (15). One should always be aware that wait times can vary considerably among regions (23).
Patient eligibility is further being broadened with the use of neo-adjuvant liver-directed therapies. A favorable response to liver-directed therapies prior to transplant resulting in tumor down-staging to within Milan or UCSF criteria coupled with a surveillance period to select individuals that will remain transplantable allows patients with higher stage tumors to receive a transplant and experience similar cancer-specific survival.
In this context, we will examine the controversial areas between surgical resection, transplantation and ablation and give an overview of the recent advances in minimally invasive surgery.
Early hepatocellular carcinoma: surgical resection versus ablation
Ablative techniques destroy tumor via temperature changes [radiofrequency (RFA), microwave (MWA), cryotherapy or lase] while causing minimal damage to adjacent, normal liver, by injection of chemicals (ethanol, acetic acid) or by combination of the above. The combination of HCC of a soft tumor surrounded by a fibrotic liver makes HCC an ideal target for ablation (24).
The most commonly used ablation techniques are RFA and MWA with radiofrequency ablation being usually the first line (25). Although most ablations are done percutaneously, open surgery offers some advantages as percutaneous approaches cannot assess the abdomen for extrahepatic disease or additional hepatic disease detectable with intraoperative US (26).
In a review that included 95 studies between 1990-2004 and 5,224 ablated tumors, 2,369 of which being hepatocellular cancer, surgical ablation (open or laparoscopic) was superior to percutaneous. Local recurrences were 14% for tumors ≤3 cm and increased to 25% for tumors 3-5 cm and to 58% for tumors >5 cm (27). In a prospective cohort of 218 patients who underwent RFA for lesions ≤2 cm and were followed for a median of 31 months, overall 5-year survival was 55% and it was 68.5% for 100 patients who were considered potential candidates for resection. However, the overall 5-year risk of recurrence was as high as 80% (28).
Huang et al. (29) randomized 76 patients with 1 or 2 tumors ≤3 cm to surgical resection and percutaneous ethanol injection and found no statistically different 5-year disease free rates (45% vs. 48%, respectively) and survival rates (46% vs. 82%, respectively) concluding equal effectiveness. Chen et al. (30) randomized 161 tumors ≤5 cm to percutaneous ablation or surgical resection and reported similar 4-year disease free rates (46% vs. 52%, respectively) and survival rates (67.9% vs. 64%, respectively). Huang et al. (32) randomized 230 patients within Milan criteria to percutaneous ablation for 115 and surgical resection for another 115 and found 5-year disease free rates (29% vs. 51%, respectively) and survival rates (55% vs. 76%, respectively) concluding that surgical resection was associated with better survival and lower recurrence. A smaller trial of 105 patients with tumors within Milan criteria, randomized them to surgical resection for 54 and percutaneous ablation with RFA or MWA for 51 and reported 3-year disease-free survival were 82% vs. 51% and 86% vs. 87% respectively which were not statistically significant and concluded similar results (31). A more recent trial of 1-2 tumors of ≤4 cm comparing resection (n=84) and RFA (n=84) found 3-year survival rates of 75% and 67% respectively and recurrence-free survival rates 61% and 50%, respectively, concluding similar therapeutic effects but percutaneous RFA more likely to be incomplete at specific sites (33).
However, these trials have been met with some skepticism as they have power limitations, treatment allocation and consent withdrawal issues whereas patients were not always followed in an intention-to-treat manner. Further evidence is needed before drawing definite conclusions.
A recent meta-analysis of small HCC treated with RFA (n=441) or resection (n=436) found higher 5-year recurrence free and survival rates for the resection group whereas in a subgroup analysis of tumors ≤3 cm resection offered improved 3-year survival rates (39).
Another meta-analysis and cost-effectiveness with Markov modeling found that RFA has a similar life expectancy and lower cost for single tumors <2 cm, resection had better life expectancy and cost-effectiveness for single tumors 3-5 cm whereas for 2-3 tumors ≤3 cm similar life expectancy and better cost-effectiveness for RFA (40).
Other studies focusing on long term outcomes for tumors <3 cm found a superiority of resection compared to ablation (41,42) whereas long term results for single tumors <7 cm comparing resection to embolization/ablation suggest that their might be a place for a combination of embolization and ablation of larger tumors (43).
Although the heterogeneity of findings necessitates more prospective randomized studies, especially from Western groups, before making definite conclusions many groups consider RFA as an effective alternative to resection for small (≤3 cm) HCC. The success of ablation decreases significantly in tumors measuring larger than 3 cm (44) and is not recommended for tumors larger than 5 cm (45).
Localized hepatocellular carcinoma: resection versus transplantation
Not every HCC patient is eligible for both resection and transplantation. Many of the HCC patients who undergo curative surgery harbor tumors beyond any criteria of transplantation. For example, resection is the only curative option for patients with large tumors and preserved liver function. The OS rate for patients with tumors greater than 10 cm is still approximately 40%, which is comparable oftentimes with survival in patients with smaller tumors (46). At the same time for many transplanted patients the degree of compromise of their liver function does not allow a safe resection. OLT is clearly the choice for patients with significant cirrhosis, although advanced cirrhosis is associated with a worse outcome even after OLT (35). Outcomes of liver resection are poorer for multifocal HCC and some authors argue against resection for multifocal tumors although it can offer good survival rates in some patients. Liver transplantation addresses HCC along with its multifocal potential and underlying cirrhosis.
One of the controversial areas is the choice between surgery and transplantation for cirrhotics with local, early stage lesions and good hepatic reserve (Child-Pugh A). The UNOS transplantation criteria oversimplify this dilemma by stating that resection candidates are excluded from eligibility for transplantation. When HCC is endemic and the number of affected patients is large, guidelines are leaning towards recommending surgical resection as a first-line treatment option for patients with early HCC who have good liver function (47,48). The main benefits of surgery for this patient population are the comparable survival, the avoidance of long waiting periods for an OLT with danger of disease progression as well as the avoidance of lifelong immunosuppression. Patients within Milan criteria appear to have similar survival after resection or transplantation (49). The benefits of transplantation are the lower recurrence rates in stage-matched patients compared to resection (50). The higher recurrence rates associated with resection vs. OLT, have made some authors suggesting OLT for tumors within Milan criteria who have good liver function (34,51). True recurrence usually arises within the first 2 years after resection and are related to tumor characteristics such as microvascular invasion, satellites and multifocal disease, whereas late recurrences are related to de novo tumors due to the underlying cirrhosis (52-55). However, a recent review of tumors within Milan criteria who underwent curative intent surgical resection concluded that although recurrence rates are high the median overall survival at 5-year was 67% and is improving the recent years (34). When examining results from liver transplant registries such as the Organ Procurement and Transplantation Network and the European Liver Transplant Registry, involving 4,482 and 8,273 patients respectively, the 5-year survival rates of 51% and 60% respectively (35,36) in contrast to the rates of 70 per cent cited by high-volume established centers(9,56).
Salvage transplantation, is a technique which allows some patients to be treated effectively with resection, and offers OLT to patients whose cancer would recur after resection (57-59). Most of the recurrences after resection occur in the liver and the majority of those are still eligible for a transplantation (49). Some researchers believe that the outcomes after salvage transplantation are similar to using transplantation as the first therapeutic choice i.e., without resection (60,61). This is supported by a recent meta-analysis as well (62). Others have expressed concern that operative mortality and recurrence rates are higher (63). The histopathologic information obtained at resection can also be used as a means to immediate listing for salvage transplantation or not. These represent interesting therapeutic strategies and more data are needed (57).
Another controversial area is the use of neoadjuvant more accurately called converison treatment to higher stage tumors and subsequent transplantation. The Barcelona Clinic Liver Cancer Group has demonstrated 5-year survival ≥50% using expanded criteria, or downstaging to Milan criteria with neoadjuvant therapies (64,65). Recently neoadjuvant TACE was successfully used to downstage 24% stage III/IV tumors to within Milan criteria and, subsequently OLT resulting in 94% survival after limited follow-up of 20 months (66). Yao et al. (67) reported that in carefully selected patients effective downstaging can be achieved in the majority followed by an observation period of 3 months minimum, and for the 57% of their patients who received an OLT the 4-year post-transplant survival was 92%. The strategy of adjuvant treatments while waiting for transplantation appears to be cost-effective for patients with anticipated waiting times longer than 1 year (68). Physicians are recommended to treat patients whose wait-list time exceeds 6 months (69,70).
Donor availability is a crucial factor in the decision making as tumors can progress during the waiting period and impede transplantation (71). Anywhere from 18% up to 50% of patients can progress beyond the Milan criteria while waiting for a transplant (15,35,72). In a study by Yao and colleagues, a 6-month waiting period for LT was associated with a 7.2% cumulative dropout probability, increasing to 55.1% at 18 months (73). Policies for transplantation aim to prioritize the sickest patients (74). Intention-to-treat analysis shows that waiting times for liver donors result in decreasing the 2-year survival from 84% to 54% and result in 5-year overall survival rates of 50-60% due to tumor progression (15). Geographic differences in waiting periods can significantly affect the decision to choose transplantation or not for early stage disease (23).
Efforts to address the large waiting list of LT candidates and to decrease the dropout rate have included new transplantation strategies (living donor, domino, split, use of extended criteria donors, and donors after cardiac death). Liver donor grafts offer shorter waiting times however there are concerns that are associated with much higher recurrence rates compared to patients who receive a cadaveric transplant after being in an observation period for a time period appropriately selective those with a less aggressive tumor biology (75). A recent meta-analysis found decreased disease free survival associated with living donor liver transplantation compared to deceased donor liver transplantation (76). However, most available data are retrospective and heterogeneous; prospective studies are needed in order to delineate under which circumstances different transplant methods should be used.
Minimally invasive surgery for hepatocellular carcinoma
Laparoscopic and robotic surgeries are being increasingly used for hepatic resections. Although the amount of existing data is limited, there is growing evidence that laparoscopic surgery is associated with lower perioperative morbidity and postoperative ascites in patients with cirrhosis and appears to have similar oncologic outcome with adequate surgical margins and long-term survival (77).
The smaller, non-anatomic resections preserve liver parenchyma which might be crucial for patients with marginal hepatic function. Advantages which are met in laparoscopic surgery in general, such as less analgesia, smaller incisions, better cosmetic result, and faster discharges are applicable for HCC patients as well. A recent meta-analysis of the existing experience showed less blood loss, fewer transfusions, shorter hospital stay and fewer complications with no differences in surgical margins and tumor recurrences (37). On the other hand, inability to tolerate pneumoperitoneum and extensive adhesions preclude the use of laparoscopic liver resection (LLR), it entails a learning curve, major bleeding might be difficult to control laparoscopically and there are procedure-specific risks such as gas embolism (78).
There are no prospective randomized clinical data comparing laparoscopic or robotic surgery to open surgery. In a large retrospective study, 116 patients underwent laparoscopic liver resection for HCC reporting a 5-year survival rate of approximately 60% (79). In a matched pair study of 42 LLR with equal open resections laparoscopic surgery appeared oncologic adequate with no differences in surgical margins and disease recurrence at 30 months (80). Adequate surgical margins are important as a RCT comparing wide (2 cm) to narrow (1 cm) resection margins in solitary HCC patients reported decreased disease recurrence and improved survival for the wide margin group (81). A recent review of the international experience with laparoscopic liver resection found 5-year survival rates comparable to open hepatic resections (78). A meta-analysis of studies on laparoscopic versus liver resection focusing on long term outcome and analyzing differently the HCC and the colorectal liver metastases patients found no differences in the 1-, 3- or 5-year survival rates (38). The international consensus conference on laparoscopic liver surgery suggested that laparoscopic surgery does not change the indications for surgery and its primary indication of laparoscopic procedures are single lesions 5 cm or less in peripheral segments recognizing the important of significant experience for extensive operations (82).
It cannot be emphasized enough that these reports of LLR come from high-volume, specialized centers and surgeons with significant experience both in open and laparoscopic surgery and the ability to choose laparoscopic surgery when it can be done safely and effectively.
Even fewer data exist about robotic liver resections (RLR) for HCC. Robotic surgery is associated with some intrinsic benefits which are visual (3-dimensional view, improved depth of perception, magnification capability) and technical (articulating instruments, degrees of freedom, tremor filtration) (83). In the few existing case series in appears to be equally effective with open and laparoscopic surgery with some authors supporting that it allows for better suturing in confined spaces, facilitating demanding procedures such as biliary reconstruction (84). Even though the existing data are limited to small case series it is important to emphasize that the existing series come from experienced surgeons and highly selected patients and tumors and are not generalizable at present. In a recent review of robotic surgery for oncologic surgery it was shown that robotic surgery is widely used for variety of operations and for several procedures, there is evidence that robotics offer short-term benefits with comparable safety profiles and oncologic outcomes (85). However, long-term oncologic outcomes are generally lacking, and robotic surgeries are more costly than open or laparoscopic surgeries. Prospective, randomized, comparative studies are needed before any statements can be made.
Summary and future perspectives
Curative treatment of hepatocellular carcinoma is particularly challenging because it should incorporate a variety of factors related to the tumor stage (size, number, location, vascular involvement), the underlying hepatic reserve (cirrhosis early vs. late), the patient’s medical comorbidities as well as the available resources which might be country specific or even hospital specific.
Surgical advances have enabled transplantation for patients with more advanced tumors and underlying liver disease. Pre-transplant therapy coupled with a surveillance period is increasingly being used in order to select the appropriate candidates for such an approach. At the same time surgical resection has entered a minimally invasive era with its inherent advantages and challenges.
Multiple risk stratification schemes exist in an attempt to assess risk and better select patients. One should also be aware that tumor clinical characteristics might be weighed differently by transplant vs. non-transplant surgeons (86).
Therefore, a multidisciplinary team, involving surgeons, hepatologists, oncologists, interventional and diagnostic radiologists, and pathologists is the most effective way to tailor the treatment plan to an individual patient’s characteristics and to the available resources and experience (Table 3).
Disclosure: The authors declare no conflict of interest.
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