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Review Article
Liver Transplantation in Mixed Hepatocellular Carcinoma and Cholangiocarcinoma
Jong Man Kimorcid
Journal of Liver Cancer 2019;19(2):85-90.
Published online: September 30, 2019

Department of Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea

Corresponding author : Jong Man Kim Department of Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, 81 Irwon-ro, Gangnam-gu, Seoul 06351, Korea tel. +82-2-3410-1719, Fax. +82-2-3410-0040 e-mail;
• Received: March 11, 2019   • Revised: April 29, 2019   • Accepted: April 29, 2019

Copyright © 2019 The Korean Liver Cancer Association

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License ( which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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  • Mixed hepatocellular carcinoma and cholangiocarcinoma (HCC-CC) are rare tumors, and the risk factors associated with them are not well understood yet. Moreover, the diagnosis of mixed HCC-CC can be complicated due to the difficulty in distinguishing mixed HCC-CC from HCC and intrahepatic CCC on radiological images. Serum tumor markers are useful when the radiological images are inconclusive. It remains unclear whether the prognosis of mixed HCC-CC differs from that of HCC. However, several studies have reported that the tumor recurrence and patient survival rates of mixed HCC-CC were similar to those of HCC after liver transplantation (LT) and liver resection. In this paper, we report that LT in patients with mixed HCC-CC achieves outcomes which are similar to those seen in LT for HCC. Therefore, the diagnosis of mixed HCC-CC should not be considered as a contraindication for LT.
Mixed hepatocellular carcinoma and cholangiocarcinoma (HCC-CC) comprise a minority of primary liver malignancies with histological features of both hepatocellular carcinoma (HCC) and cholangiocarcinoma (CC) [1,2]. The geographical distribution and the age and gender distribution for mixed HCC-CC and HCC are similar; however, mixed HCC-CC has a poor prognosis [3,4].
The origin of mixed HCC-CC is still debatable; however, a bipotential precursor might explain the origin of mixed HCC-CC tumors [5]. Patients often remain asymptomatic until the advanced stage of the disease, and common symptoms, such as weight loss, malaise, abdominal discomfort, jaundice, hepatomegaly or a palpable abdominal mass, are non-specific [6]. The original histological classification of mixed HCC-CC included three types: type A for separate nodules of HCC and intrahepatic CCC (iCCC), type B for contiguous masses that might mingle with continued growth, and type C for HCC and CC combined within the same tumor [7]. A second classification system classified thee types; type I for coincidental occurrence of HCC and intrahepatic iCCC as separate nodules, type II for transitional tumors, and type III for the fibrolamellar HCC variant [7]. In 2010, the WHO proposed a new classification for mixed HCC-CC: [1] “classic” HCC-CC that includes Allen Type 1 and Good-man Type A tumors (distinct nodules of HCC and intrahepatic cholangiocarcinoma (ICC) ranging from low to high grade) and [2] “stem cell” HCC-CC, which is further divided into three subgroups: typical, intermediate and cholangiocellular [3].
The finding of mixed HCC-CC is much lower than that of HCC in liver transplantation (LT) patients (accounting for 0.4-14.2% of preoperatively diagnosed HCC patients) and a preoperative diagnosis is difficult [8]. Most mixed HCC-CC lesions have been detected incidentally in surgical specimens. Moreover, because of its rarity, the clinic-pathological characteristics and post-transplant prognosis of mixed HCC-CC have not previously been reported in detail. Here, we review the literature and report the rates of misdiagnosis of mixed HCC-CC, and the outcomes after LT for mixed HCC-CC.
It is difficult to diagnose mixed HCC-CC accurately before surgical resection or LT (Table 1). Thus, most mixed HCC-CC are misdiagnosed as HCC, and surgical resection or LT is performed. The overall incidence of misdiagnosed HCC or incidental ICC and/or mixed HCC-CC in patients undergoing LT for any cause was reported as 0.7% [9]. The reported incidence of misdiagnosed iCCC alone was 0.34% and that of mixed HCC-CC alone was 0.48% (P =0.056). These findings suggest that mixed HCC-CC is more common than iCCC. In addition, the reported incidences of these uncommon tumors in liver explants were similar worldwide [9].
While mixed HCC-CC tumors have been reported to be more common in male patients and in those with cirrhosis and/or chronic hepatitis, their clinical characteristics remain poorly understood [3]. Some previous reports suggested that preoperative radiologic imaging with contrast enhancement in the arterial and portal venous phases without washout could reveal the presence of mixed HCC-CC. Several studies have reported that these tumors present characteristics of both iCCC and HCC but demonstrate an enhancement pattern and have ancillary features similar to iCCC [10,11]. Additionally, these tumors might be associated with higher carbohydrate antigen (CA) 19-9 and alpha-fetoprotein levels [12]. Therefore, distinguishing between mixed HCC-CC, HCC, and CCC without biopsy continues to be a challenge, and malignancies other than HCC are still encountered, often unexpectedly, in explanted liver specimens.
Dynamic contrast-enhanced magnetic resonance imaging (MRI) and computed tomography (CT) are often used in the evaluation of mixed HCC-CC. In one small case series study, MRI was reported to be 100% sensitive, while CT demonstrated a sensitivity of 78% [13]. The authors propose that the evidence of both HCC and CCC features in the same tumor suggest the possible presence of mixed HCC-CC [13]. Another study reported that a high signal on T2 sequences, the presence of tumor areas with progressive enhancement/contrast retention, and lack of a capsule could indicate a mixed HCC-CC [14]. In 2013, Ijichi et al. [15] reported the use of 18F-fluorodeoxyglucose positron emission tomography-CT (PET-CT) imaging to evaluate three patients by mixed HCC-CC. In this case series, all the mixed HCC-CC tumors were detected by PET, with maximum standardized uptake value (SUVmax) of 9.9, 12.0, and 13.0. Moreover, SUVmax levels correlated with the tumor size or tumor markers. Li et al. [16] conducted a retrospective evaluation of tumor markers in their cohort of patients. They found a wide variety of characteristics displayed by mixed HCC-CC, particularly variations in alphafetoprotein (AFP) and CA 19-9 expression. They concluded that investigating patients for elevation of multiple tumor markers, or discordance between the tumor marker levels and imaging patterns of the lesions (i.e., AFP elevation but the absence of classical imaging features consistent with HCC), might significantly increase the diagnosis of mixed HCC-CC.
However, radiologists generally agree that it is extremely difficult to identify mixed HCC-CC accurately, based only on imaging findings [10]. Therefore, several authors have proposed that lesion biopsy could be helpful for a more precise diagnosis [1].
Survival of mixed HCC-CC patients depends on the type of treatment received. The most common treatment for mixed HCC-CC has been liver resection, and several studies have reported a 3-year survival rate of 25-50% after liver resection [4,17]. HCC is now a primary indication for LT in patients with within Milan criteria or downstaged HCC, and an overall survival rate of 70% has been reported with LT [4,7]. Unfortunately, there are only a small number of studies about LT for mixed HCC-CC.
Chan et al. [18] were the first to report about LT for mixed HCC-CC, and two of the three patients were alive with no evidence of disease at 25 and 35 months after the procedure. Panjala et al. [1] published the largest single-institution case series of 12 patients undergoing LT for mixed HCC-CC. Of these, one patient died 48 days after LT due to procedure-related complications, and the median overall survival (OS) of the remaining patients was 3.6 years. Song et al. [19] reported outcomes in patients diagnosed with mixed HCC-CC either after liver resection for primary liver cancer (68 patients) or after LT for primary liver cancer (eight patients) between 1995 and 2012. In their study, one patient underwent deceased donor LT while seven patients underwent living donor LT. The authors reported that patients showed slightly better disease-free survival (DFS) and OS after LT, although the results were not statically significant. Specifically, 5-year DFS rates were 26.2% vs. 37.5% (P =0.333), while 5-year OS rates were 42.1% vs. 50% (P =0.591). There were no differences in DFS or OS rates between the liver resection and LT group. Given the limitation due to the retrospective nature of the study, they concluded that the role of LT in the treatment of mixed HCC-CC remains unclear and that in cases with preserved liver function and tumors smaller than 5 cm, liver resection should still be considered, particularly when complete resection with an adequate safety margin is possible. Jung et al. [4] reported favorable post-transplant outcomes in patients with 1 or 2 mixed HCC-CCs ≤2.0 cm in size, with a tumor recurrence rate of 13.3% and a patient survival rate of 93.3% after 5 years. The long-term post-transplant prognoses were similar following LT and liver resection, but the post-recurrence patient survival rate was poor in LT recipients. These potential selection criteria for LT in mixed HCC-CC are similar to the super-selection criteria for LT in HCC patients, namely the presence of 1 or 2 tumors up to 2 cm in size [20]. Considering the favorable outcomes reported for patients with 1 or 2 mixed HCC-CCs ≤2.0 cm, this suggests that patients in the very early stage of mixed HCC-CC might be suitable candidates for LT. Additionally, given that very early mixed HCC-CC demonstrated favorable post-transplant prognosis, less stricter follow-up may be required (Table 2).
Several studies have reported that the OS rate of mixed HCC-CC patients is comparable to that of HCC patients [11,21,22]. However, one study reported that the OS rate of patients with HCC was statistically significantly higher than that of patients with iCCC or mixed HCC-CC. However, this difference was not significant in the subgroup analyses of patients with only mixed HCC-CC and in those with a solitary tumor less than 2 cm in size [23]. Additionally, several studies found a significantly lower DFS in patients with iCCC or mixed HCC-CC compared to matched HCC patients [21,23]; however, another study reported no difference in DFS between the two groups [22].
A Spanish, matched cohort, multicenter study reported that patients with either iCCC or mixed HCC-CC had a higher rate of recurrence, a higher cumulative risk of recurrence, and a lower survival rate compared to HCC patients [23]. However, further analyses demonstrated that these differences were driven by the iCCC patients in the group. Particularly, when we analyzed the iCCC and mixed HCC-CC subgroups separately, the mixed HCC-CC cohort had a 5-year survival rate of approximately 80% (n=15), equivalent to that of the matched cohort of HCC patients (n=30). Furthermore, no significant differences were observed in the 5-year cumulative risk of recurrence between the mixed HCC-CC and HCC patients (7% vs. 4%, respectively). A recurrence rate was lower than what has been previously reported for mixed HCC-CC patients could be attributed to the fact that 67% of the patients had a single tumor, and <20% showed microvascular invasion or satellite lesions. Further, they reported that mixed HCC-CC patients who had single tumors of size 2 cm or smaller, achieved excellent survival rates that were comparable to the controls. The mixed HCC-CC subgroup of patients that met the above criteria achieved a 5-year survival rate after LT, which is similar to that of HCC patients within the Milan criteria [24]. The authors concluded that preoperative biopsy resulting in a diagnosis of mixed HCC-CC should not exclude patients from undergoing LT [23].
Based on the data obtained from the United Network for Organ Sharing (UNOS) database collected between 1994 and 2013, patients who underwent LT for HCC-CC had overall 1-, 3-, and 5-year survival rates of 82%, 47%, and 40%, respectively, and a median survival duration of 29 months [7]. Patients who underwent LT for HCC had significantly better 1-, 3-, and 5-year survival rates (86%, 72%, and 62%, respectively) than those who underwent LT for mixed HCC-CC [7]. Additionally, LT for mixed HCC-CC achieves a survival rate similar to that after LT in carefully selected patients of iCCC, based on the data from the UNOS database. Similarly, graft survival rate was significantly better in the HCC group (82%, 68%, 54% at 1-, 3-, and 5-years, respectively) compared to patients with mixed HCC-CC or iCCC [7]. Interestingly, the acute rejection rate at 6 months was higher in patients with iCCC (22.4%) than in those with mixed HCC-CC (19%) and HCC (12.7%) [7]. The recurrence rate in mixed HCC-CC patients after LT was reported to be 42% in a meta-analysis [9]. The most common site for recurrence was extrahepatic (73%). Intrahepatic recurrence was noted in 12% of all recurrences, while both intra- and extrahepatic recurrences were present in 15% of recurrence cases [9].
Surgical resection is associated with acceptable outcomes in mixed HCC-CC. In addition, the long-term outcomes of tumor recurrence and patient survival following LT and liver resection were similar in patients with mixed HCC-CC and HCC. Therefore, if mixed HCC-CC is diagnosed on biopsy, the patient should not be excluded from the LT program. However, reported studies have been limited by small sample sizes and do not allow for definite conclusions. Future prospective studies are required to maximize the benefits of LT in patients with mixed HCC-CC.

The authors have no conflicts to disclose.

Table 1.
Clinical characteristics of the patients in the selected studies
Study Country/study period Numbers of mixed HCC-CC Mean/median age (years) Median AFP (ng/mL) Median CA 19-9 (U/mL) Mean/median MELD score
Gupta et al. [9] Japan/1996-2015 2/573 (0.3) 48.5 7 (2-17) 80 (9-509) 20
Serra et al. [25] Italy/2000-2015 4/655 (0.6) - - - -
takahashi et al. [26] USA/2003-2014 4/1,188 (0.3) 60.1 - - 20
Itoh et al. [22] Japan/1999-2014 8/178 (4.5) 57.5 19.7 (2.8-49.6) 57.2 (0.6-100.9) -
Sapisochin et al. [23] Spain/2000-2010 24/7,876 (3.0) 58 6.6 (1.2-216) - 11
Facciuto et al. [21] USA/1993-2013 25/3,073 (0.8) 60 - - 14
Park et al. [27] Korea/1999-2009 15/2,137 (0.7) 59 32.6 (0.9-793) - 14
Sapisochin et al. [11] USA/1999-2009 10/302 (3.3) 59 6.5 (1.6-464) - 16
Song et al. [19] Korea/1995-2012 8/- 53.7 - - 17
Panjala et al. [1] USA/1998-2008 12/- 61 - - -
Groeschl et al. [17] SeeR database/1973-2007 19/1,466 (1.3) 61.5 - - -
Jung et al. [4] Korea/2005-2014 32/3,103 (1.0) 53.4 32.6 13.7 14

Values are presented as number (%) or median (range).

HCC-CC, hepatocellular carcinoma and cholangiocarcinoma; AFP, alpha-fetoprotein; CA 19-9, carbohydrate antigen 19-9; MELD, model for endstage liver disease.

Table 2.
Pathological data and outcomes
Study Mean/median tumor size (cm) Mean/median tumor numbers Mean/median follow-up durations (months) Disease-free survival rate (%)
Overall survival rate (%)
1-year 3-year 5-year 1-year 3-year 5-year
Gupta et al. [9] 1.8 1 60 (6-168) 60 60 60 60 60 60
Serra et al. [25] - - - - - - - - -
takahashi et al. [26] 2.1 1.9 18.8 67 42 - - -
Itoh et al. [22] 2.6 - - 86 86 86 88 73 73
Sapisochin et al. [23] 2.9 1 41.7 (3.3-140.6) - - - 83 70 60
Facciuto et al. [21] 2.5 1 47 62 - 44 71 - 57
Park et al. [27] 2.9 - - 60 53 53 66.7 60 60
Sapisochin et al. [11] 3 1 32 60 - 30 79 - 32
Song et al. [19] 2.1 3 48.6 (11-124) 50 38 25 75 50 25
Panjala et al. [1] - - 111.6 - - - 79 66 16
Groeschl et al. [17] - - 36 (19-89) - - - 89 48 -
Jung et al. [4] 2.5 1.3 48.6 - - - 84.4 73.1 65.8

Values are presented as number (range) unless otherwise indicated.

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      J Liver Cancer. 2019;19(2):85-90.   Published online September 30, 2019
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