Hepatitis C and hepatitis B nucleic acids are present in intrahepatic cholangiocarcinomas from the United States

HBV infection effects prognosis and activates the immune response in intrahepatic cholangiocarcinoma

BACKGROUND

The impact of HBV infection on the prognosis of patients with intrahepatic cholangiocarcinoma (ICC) remains uncertain, and the underlying mechanism has not been elucidated. This study aims to explore the potential mechanism via clinical perspectives and immune features.

METHODS

We retrospectively reviewed 1308 patients with ICC treated surgically from January 2007 to January 2015. Then, we compared immune-related markers using immunohistochemistry staining to obtain the gene expression profile GSE107943 and related literature for preliminary bioinformatics analysis. Subsequently, we conducted a drug sensitivity assay to validate the role of TNFSF9 in the ICC organoid-autologous immune cell coculture system and in the patient-derived organoids-based xenograft platform.

RESULTS

The analysis revealed that tumors in patients without HBV infection exhibited greater size and a higher likelihood of lymphatic metastasis, tumor invasion, and relapse. After resection, HBV-infected patients had longer survival time than uninfected patients (p<0.01). Interestingly, the expression of immune-related markers in HBV-positive patients with ICC was higher than that in uninfected patients (p<0.01). The percentage of CD8+ T cells in HBV-positive tissue was higher than that without HBV infection (p<0.05). We screened 21 differentially expressed genes and investigated the function of TNFSF9 through bioinformatics analyses. The expression of TNFSF9 in ICC organoids with HBV infection was lower than that in organoids without HBV infection. The growth of HBV-negative ICC organoids was significantly inhibited by inhibiting the expression of TNFSF9 with a neutralizing antibody. Additionally, the growth rate was faster in HbsAg (-) ICC patient-derived organoids-based xenograft model than in HbsAg (+) group.

CONCLUSIONS

The activation of the immune response induced by HBV infection makes the prognosis of HBV-positive patients with ICC differ from that of uninfected patients.

MYC determines lineage commitment in KRAS-driven primary liver cancer development

BACKGROUND & AIMS

Primary liver cancer (PLC) comprises hepatocellular carcinoma (HCC) and intrahepatic cholangiocarcinoma (iCCA), two frequent and lethal tumour types that differ regarding their tumour biology and responses to cancer therapies. Liver cells harbour a high degree of cellular plasticity and can give rise to either HCC or iCCA. However, little is known about the cell-intrinsic mechanisms directing an oncogenically transformed liver cell to either HCC or iCCA. The scope of this study was to identify cell-intrinsic factors determining lineage commitment in PLC.

METHODS

Cross-species transcriptomic and epigenetic profiling was applied to murine HCCs and iCCAs and to two human PLC cohorts. Integrative data analysis comprised epigenetic Landscape In Silico deletion Analysis (LISA) of transcriptomic data and Hypergeometric Optimization of Motif EnRichment (HOMER) analysis of chromatin accessibility data. Identified candidate genes were subjected to functional genetic testing in non-germline genetically engineered PLC mouse models (shRNAmir knockdown or overexpression of full-length cDNAs).

RESULTS

Integrative bioinformatic analyses of transcriptomic and epigenetic data pinpointed the Forkhead-family transcription factors FOXA1 and FOXA2 as MYC-dependent determination factors of the HCC lineage. Conversely, the ETS family transcription factor ETS1 was identified as a determinant of the iCCA lineage, which was found to be suppressed by MYC during HCC development. Strikingly, shRNA-mediated suppression of FOXA1 and FOXA2 with concomitant ETS1 expression fully switched HCC to iCCA development in PLC mouse models.

CONCLUSIONS

The herein reported data establish MYC as a key determinant of lineage commitment in PLC and provide a molecular explanation why common liver-damaging risk factors such as alcoholic or non-alcoholic steatohepatitis can lead to either HCC or iCCA.

IMPACT AND IMPLICATIONS

Liver cancer is a major health problem and comprises hepatocellular carcinoma (HCC) and intrahepatic cholangiocarcinoma (iCCA), two frequent and lethal tumour types that differ regarding their morphology, tumour biology, and responses to cancer therapies. We identified the transcription factor and oncogenic master regulator MYC as a switch between HCC and iCCA development. When MYC levels are high at the time point when a hepatocyte becomes a tumour cell, an HCC is growing out. Conversely, if MYC levels are low at this time point, the result is the outgrowth of an iCCA. Our study provides a molecular explanation why common liver-damaging risk factors such as alcoholic or non-alcoholic steatohepatitis can lead to either HCC or iCCA. Furthermore, our data harbour potential for the development of better PLC therapies.

Imaging features based on CT and MRI for predicting prognosis of patients with intrahepatic cholangiocarcinoma: a single-center study and meta-analysis

BACKGROUND

To evaluate the prognostic role of imaging features based on CT and MRI in intrahepatic cholangiocarcinoma (ICC).

METHODS

Two hundred and four patients from a single-center database who underwent radical ICC surgery from 2010 to 2019 were enrolled in the study. Cox proportional hazard model was used for survival analysis of imaging features. A meta-analysis was performed to determine imaging features that predict overall survival (OS) and event-free survival (EFS) in ICC.

RESULTS

In the CT group of the retrospective cohort, tumor multiplicity, infiltrative tumor margin, lymph node metastasis, enhancement pattern in hepatic arterial phase and tumor necrosis correlated with poorer EFS and OS; moreover, enhancing capsules, high carcinoembryonic antigen levels contributed to poor OS. In the MRI group, tumor multiplicity and enhancement pattern were prognostic factors for OS; tumor multiplicity and enhancement pattern resulted in poor EFS. A total of 13 articles containing 1822 patients with ICC were enrolled in the adjusted hazard ratios meta-analysis. The results showed that enhancement pattern and infiltrative tumor margin were predictors of OS and EFS, whereas bile duct invasion was a predictor of OS.

CONCLUSIONS

Arterial enhancement patterns and tumor margin status were associated with both OS and EFS of ICC patients following resection.

Hepatitis B virus infection and the risk of gastrointestinal cancers among Chinese population: A prospective cohort study

Our study aims to explore the relationship between chronic hepatitis B virus (HBV) infection and the risk of gastrointestinal (GI) cancers including liver, gastric, gallbladder or extrahepatic bile duct, pancreatic, small intestine, esophageal and colorectal cancer in the Kailuan Cohort study. We prospectively examined the relationship between HBV infection and new‐onset GI cancers among 93 402 participants. Cox proportional hazards regression models, subgroup analyses and competing risk analyses were used to evaluate the association between HBV infection and the risk of new‐onset GI cancers. During a median follow‐up of 13.02 years, 1791 incident GI cancer cases were diagnosed. Compared to HBsAg seronegative participants, a significant positive association between HBV infection and GI cancers was observed in the multivariate‐adjusted models (HR 5.59, 95% CI: 4.84‐6.45). In the site‐specific analyses, participants with HBsAg seropositive exhibited an increased risk of liver cancer (HR = 21.56, 95% CI: 17.32‐26.85), gallbladder or extrahepatic bile duct cancer (HR = 14.89, 95% CI: 10.36‐21.41), colorectal cancer (HR = 1.75, 95% CI: 1.15‐2.96) and pancreatic cancer (HR = 1.86, 95% CI: 1.10‐3.99). After taking death as the competing risk event, the associations of HBV infection with the risk of these cancers were attenuated but remained significant both in the cause‐specific hazards models, the subdistribution proportional hazards models and sensitivity analyses. Our study suggests that HBV infection is associated with the elevated risk of liver cancer and extrahepatic cancer including gallbladder or extrahepatic bile duct, pancreatic and colorectal cancer among adults in Northern China.

Impact of hepatitis C virus on survival in patients undergoing resection of intrahepatic cholangiocarcinoma: Report of a Japanese nationwide survey

AIM

We reviewed the data of a nationwide follow-up survey to determine the impact of hepatitis C virus (HCV) infection on the outcomes of hepatectomy for mass-forming (MF) type, and combined mass-forming and periductal infiltrating (MF + PI) type intrahepatic cholangiocarcinoma (ICC).

METHODS

In total, 956 patients with ICC who underwent curative hepatic resection were included in this cohort study, and patients were classified according to virus status. Patients were classified according to virus status as follows: HCV-related ICC (n = 138, 14.4%), hepatitis B virus (HBV)-related ICC (n = 43, 4.5%) and non-virus-related ICC (n = 775, 81.1%). To control for variables, we used 1:1 propensity score-matching to compare outcomes after surgery between HCV-related (n = 102) and non-virus-related ICC cases (n = 102).

RESULTS

We successfully matched HCV-related and non-virus-related ICC cases with similar liver function and tumor characteristics. Patients with HCV-related ICC had significantly shorter recurrence-free survival (hazard ratio 0.62, 95% confidence interval 0.42-0.92, p = 0.016) and overall survival (hazard ratio: 0.57, 95% confidence interval: 0.37-0.88, p = 0.011) than patients with non-virus-related ICC. Cox proportional hazard analysis showed that HCV-related ICC offered a worse prognosis than non-virus-related ICC.

CONCLUSIONS

HCV infection increases the risk of recurrence and worsens overall survival in patients after curative resection for MF and combined MF + PI type ICC.

Update on the association of hepatitis B with intrahepatic cholangiocarcinoma: Is there new evidence?

Intrahepatic cholangiocarcinoma (iCCA) is a subgroup of cholangiocarcinoma that accounts for about 10%-20% of the total cases. Infection with hepatitis B virus (HBV) is one of the most important predisposing factors leading to the formation of iCCA. It has been recently estimated based on abundant epidemiological data that the association between HBV infection and iCCA is strong with an odds ratio of about 4.5. The HBV-associated mechanisms that lead to iCCA are under intense investigation. The diagnosis of iCCA in the context of chronic liver disease is challenging and often requires histological confirmation to distinguish from hepatocellular carcinoma. It is currently unclear whether antiviral treatment for HBV can decrease the incidence of iCCA. In terms of management, surgical resection remains the mainstay of treatment. There is a need for effective treatment modalities beyond resection in both first- and second-line treatment. In this review, we summarize the epidemiological evidence that links the two entities, discuss the pathogenesis of HBV-associated iCCA, and present the available data on the diagnosis and management of this cancer.

Associations between hepatitis B virus exposure and the risk of extrahepatic digestive system cancers: A hospital-based, case-control study (SIGES)

OBJECTIVES

This case-control study was aimed to investigate associations between HBV infection and extrahepatic digestive system cancers.

METHODS

The patients of gastric, small intestinal, colonic, rectal, anal, biliary tract, and pancreatic cancers were retrospectively collected between 2016.5 and 2017.12. Simultaneously, the healthy controls were collected from the health check-up registry, and cancer-free status was confirmed based on medical records. Propensity score matching was performed to reduce bias. Multinomial logit model and conditional logistic regression model were used to assess the risk of individual cancer according to HBV serological markers and classifications.

RESULTS

Totally, 4748 patients involving seven cancers, and 57,499 controls were included. After matching, HBsAg was associated with increased risk of gastric cancer (aOR = 1.39, 95% CI: 1.05-1.85), and anti-HBs served as a protective factor for gastric (aOR = 0.72, 95% CI: 0.61-0.85), colonic (aOR = 0.73, 95% CI: 0.60-0.89), rectal (aOR = 0.73, 95% CI: 0.63-0.85), and pancreatic (aOR = 0.58, 95% CI: 0.42-0.82) cancers. Compared to subgroups with non-infection and vaccination status, inactive HBsAg carriers and active HBV infection subgroup were correlated with gastric carcinogenesis (aOR = 1.41, 95% CI: 1.03-1.93). However, no clear association was found between HBV infection and other cancers.

CONCLUSIONS

HBV infection was potentially associated with an increased risk of gastric cancer. The development mechanism of HBV-associated gastric cancer needs to investigate further.

Characterization of hepatitis B virus DNA integration patterns in intrahepatic cholangiocarcinoma

AIM

Hepatitis B virus (HBV) integration is one of the mechanisms contributing to hepatocellular carcinoma (HCC) development. However, the status of HBV integration in intrahepatic cholangiocarcinoma (ICC) is poorly understood. This study aims to characterize the viral integration in HBV-related ICC.

METHODS

The presence of HBV S and C gene in ICCs and the paratumor tissue was determined by polymerase chain reaction direct sequencing. Hepatitis B virus integration was detected by a high-throughput capture sequencing method. The expression analysis of the genes targeted by HBV in ICC was undertaken in The Cancer Genome Atlas dataset.

RESULTS

Hepatitis B virus S and/or C gene fragments were detected in 71.43% (10/14) ICCs and 57.14% (8/14) paratumor tissues. Using the high-throughput capture sequencing approach, 139 and 183 HBV integration breakpoints were identified from seven ICC and seven paired paratumor tissues, respectively. Seven genes (TERT, CEACAM20, SPATA18, TRERF1, ZNF23, LINC01449, and LINC00486) were recurrently targeted by HBV-DNA in different ICC tissues or different cell populations of the same tissue. TERT, which is the most preferential HBV target gene in HCC, was found to be repeatedly interrupted by HBV-DNA in three different ICC tissues. Based on The Cancer Genome Atlas dataset, TERT, as well as three other HBV recurrently targeted genes (SPATA18, TRERF1, and ZNF23), showed differential expression levels between ICC and para-ICC tissues.

CONCLUSIONS

Taken together, HBV integration is a common event in HBV-related ICC. The HBV recurrent integration genes identified from this study, such as TERT, provide new clues for further research on the causative link between HBV infection and ICC.

Viruses in Cancers of the Digestive System: Active Contributors or Idle Bystanders?

The human virome, which is a collection of all the viruses that are present in the human body, is increasingly being recognized as an essential part of the human microbiota. The human gastrointestinal tract and related organs (e.g., liver, pancreas, and gallbladder)-composing the gastrointestinal (or digestive) system-contain a huge number of viral particles which contribute to maintaining tissue homeostasis and keeping our body healthy. However, perturbations of the virome steady-state may, both directly and indirectly, ignite/sustain oncogenic mechanisms contributing to the initiation of a dysplastic process and/or cancer progression. In this review, we summarize and discuss the available evidence on the association and role of viruses in the development of cancers of the digestive system.

A case of focal confluent hepatic fibrosis in the patient with hepatitis C virus-related liver cirrhosis: a mimic of cholangiolocellular carcinoma

During routine ultrasound examination, a hyperechoic mass was detected in the anterior segment of the liver in an 80-year-old woman with hepatitis C virus-related cirrhosis. Computed tomography and magnetic resonance imaging findings suggested a malignant tumor with abundant fibrous stroma, similar to cholangiolocellular carcinoma. However, subsequent partial hepatectomy revealed a mass characterized by abundant fibrosis without tumor cells, dilated blood vessels, and marginal ductular reaction. Accordingly, focal confluent fibrosis was diagnosed. Generally, the diagnosis of focal confluent fibrosis is straightforward because of its well-established imaging characteristics. However, its differentiation from a malignant tumor can occasionally be difficult because of variation in presentation depending on the amount of fibrous stroma and the degree of inflammatory cell infiltration. In the present case, diagnosis was difficult because the lesion was more localized than usual, presenting a mass-like shape, and there was obvious hyperintensity on T2-weighted imaging and ring-shaped hyperintensity on diffusion-weighted imaging. Moreover, hepatic capsular retraction was indistinct, which can be one of the key findings of focal confluent fibrosis. When a hepatic mass is associated with a fibrous lesion, focal confluent fibrosis should be considered in the differential diagnosis, even though the lesion is associated with several atypical findings.

Prognostic impact of hepatitis B or C on intrahepatic cholangiocarcinoma

BACKGROUND/AIMS

Intrahepatic cholangiocarcinoma (ICC) is the second-most common primary liver malignancy, arising from the peripheral intrahepatic bile duct epithelium. Hepatitis B virus (HBV) or hepatitis C virus (HCV) may be involved in the development of ICC. We explored the prognostic value of hepatitis virus infection, as well as other prognostic factors affecting survival in patients with ICC.

METHODS

A retrospective chart review was performed for patients diagnosed with ICC between August 2005 and December 2018 at Konkuk University Medical Center. We identified a total of 131 patients with ICC. Overall survival rates of patients with and without hepatitis were determined. Univariate and multivariate analyses were used to estimate factors influencing survival outcomes.

RESULTS

A total of 17.6% (23/131) of patients were positive for HBV or HCV. Hepatitis B positive ICC patients were significantly younger with higher albumin and higher α-fetoprotein than those without hepatitis viral infections. The median survival of hepatitis-positive and hepatitis-negative groups was 280 and 213 days, respectively. Survival rates were not significantly different between the two groups (p = 0.279). Multivariate analyses indicated that lower serum carbohydrate antigen 19-9 (CA 19-9) (p < 0.001), lower T stage (p = 0.042), the absence of lymph-node metastasis (p = 0.043), and receiving curative surgery (p = 0.033) were independent predictors of better outcomes.

CONCLUSION

While hepatitis influenced a number of clinical features in ICC patients, it did not affect survival rate. Prognostic factors influencing survival outcomes with ICC were CA 19-9 level, T stage, the presence of lymph node metastasis, and curative surgery.

Hepatitis B and C virus infection and risk of haematological malignancies

Hepatitis B virus (HBV) and hepatitis C virus (HCV) are classified as oncogenic human viruses. Chronic HBV and HCV infections are associated with higher risk of haematological malignancy development. Direct and indirect oncogenic mechanisms have been demonstrated for both HBV and HCV in several studies. HCV and overt/occult HBV infections in patients with oncohaematological disease constitute an impediment and a threat during immunosuppressive chemotherapy treatment. We review the HBV and HCV oncogenic mechanisms and the impact and the safety of antiviral treatment in patients with haematological malignancies.

Chronic hepatitis B infection and non-hepatocellular cancers: A hospital registry-based, case-control study

Background

Prior epidemiological evidences suggest that hepatitis B virus (HBV) infection is linked to cancers other than hepatocellular carcinoma. This prospective hospital registry-based case-control study aimed to investigate the sero-epidemiological association between chronic HBV infection and various types of cancer.

Methods

95,034 patients with first-diagnosed non-hepatocellular malignancy in a tertiary hospital between 2007 and 2014; and 118,891 non-cancer individuals as controls from a health promotion center were included. Cases and controls were compared for HBV surface antigen (HBsAg) positivity by conditional regression with adjustment for age, hypertension, diabetes, body mass index, alcohol consumption, smoking status and cholesterol level in both genders.

Results

An analysis of matched data indicated significant associations of HBV infection with lymphoma (adjusted odds ratio[AOR] 1.53 [95% CI 1.12–2.09] in men and 3.04 [1.92–4.82] in women) and biliary cancer (2.59[1.98–3.39] in men and 1.71[1.16–2.51] in women). Cervical (1.49[1.11–2.00]), uterine (1.69[1.09–2.61]), breast (1.16[1.02–1.32]), thyroid (1.49[1.28–1.74]), and lung cancers (1.79[1.32–2.44]) in women; and skin cancer (5.33[1.55–18.30]) in men were also significantly related to HBV infection.

Conclusions

Chronic HBV infection is associated with several malignant disorders including lymphoma, and biliary, cervical, uterine, breast, thyroid, lung, and skin cancers. Our findings may offer additional insights into the development of these neoplasms and may suggest the need to consider HBV screening in cancer patients and cancer surveillance in HBV-infected subjects.

Emergence of Intrahepatic Cholangiocarcinoma: How High-Throughput Technologies Expedite the Solutions for a Rare Cancer Type

Intrahepatic cholangiocarcinoma (ICC) is the cancer of the intrahepatic bile ducts, and together with hepatocellular carcinoma (HCC), constitute the majority of primary liver cancers. ICC is a rare disorder as its overall incidence is < 1/100,000 in the United States and Europe. However, it shows much higher incidence in particular geographical regions, such as northeastern Thailand, where liver fluke infection is the most common risk factor of ICC. Since the early stages of ICC are often asymptomatic, the patients are usually diagnosed at advanced stages with no effective treatments available, leading to the high mortality rate. In addition, unclear genetic mechanisms, heterogeneous nature, and various etiologies complicate the development of new efficient treatments. Recently, a number of studies have employed high-throughput approaches, including next-generation sequencing and mass spectrometry, in order to understand ICC in different biological aspects. In general, the majority of recurrent genetic alterations identified in ICC are enriched in known tumor suppressor genes and oncogenes, such as mutations in TP53, KRAS, BAP1, ARID1A, IDH1, IDH2, and novel FGFR2 fusion genes. Yet, there are no major driver genes with immediate clinical solutions characterized. Interestingly, recent studies utilized multi-omics data to classify ICC into two main subgroups, one with immune response genes as the main driving factor, while another is enriched with driver mutations in the genes associated with epigenetic regulations, such as IDH1 and IDH2. The two subgroups also show different hypermethylation patterns in the promoter regions. Additionally, the immune response induced by host-pathogen interactions, i.e., liver fluke infection, may further stimulate tumor growth through alterations of the tumor microenvironment. For in-depth functional studies, although many ICC cell lines have been globally established, these homogeneous cell lines may not fully explain the highly heterogeneous genetic contents of this disorder. Therefore, the advent of patient-derived xenograft and 3D patient-derived organoids as new disease models together with the understanding of evolution and genetic alterations of tumor cells at the single-cell resolution will likely become the main focus to fill the current translational research gaps of ICC in the future.

Risk factors for intrahepatic and extrahepatic cholangiocarcinoma in the United States: A population-based study in SEER-Medicare

Objectives

Intrahepatic (ICC) and extrahepatic (ECC) cholangiocarcinomas are rare tumors that arise from the epithelial cells of the bile ducts, and the etiology of both cancer types is poorly understood. Thus, we utilized the Surveillance, Epidemiology, and End Results (SEER)-Medicare resource to examine risk factors and novel preexisting medical conditions that may be associated with these cancer types.

Methods

Between 2000 and 2011, 2,092 ICC and 2,981 ECC cases and 323,615 controls were identified using the SEER-Medicare database. Logistic regression was used to calculate adjusted odds ratios (OR) and 95% confidence intervals (CI).

Results

Non-alcoholic fatty liver disease was associated with approximately 3-fold increased risks of ICC (OR = 3.52, 95% CI: 2.87–4.32) and ECC (OR = 2.93, 95% CI: 2.42–3.55). Other metabolic conditions, including obesity and type 2 diabetes, were also associated with increased risks of both cancer types. Smoking was associated with a 46% and 77% increased ICC and ECC risk, respectively. Several autoimmune/inflammatory conditions, including type 1 diabetes and gout, were associated with increased risks of ICC/ECC. As anticipated, viral hepatitis, alcohol-related disorders, and bile duct conditions were associated with both cancer types. However, thyrotoxicosis and hemochromatosis were associated with an increased risk of ICC but not ECC, but did not remain significantly associated after Bonferroni correction.

Conclusions

In this study, risk factors for ICC and ECC were similar, with the exceptions of thyrotoxicosis and hemochromatosis. Notably, metabolic conditions were associated with both cancer types. As metabolic conditions are increasing in prevalence, these could be increasingly important risk factors for both types of cholangiocarcinoma.

Comparison of clinicopathological characteristics between cirrhotic and non-cirrhotic patients with intrahepatic cholangiocarcinoma: A large-scale retrospective study

The effect of cirrhosis on the characteristics of intrahepatic cholangiocarcinoma (ICC) has not been fully elucidated. The purpose of this study was to investigate how cirrhosis affects the clinicopathological characteristics and survival of surgically treated ICC patients. A total of 1,312 ICC patients surgically treated between January 2007 and December 2011 at a single institution were retrospectively reviewed and the clinicopathological data were compared between cirrhotic and non-cirrhotic patients. Univariate and multivariate analyses were performed to identify significant and independent prognostic factors in this cohort. A total of 302 patients (23.0%) were cirrhotic. Compared with cirrhotic patients, the tumors in non-cirrhotic patients were usually larger, less differentiated, and more likely to have lymphatic metastasis, vascular and perineural invasion. Following resection, cirrhotic patients achieved a longer survival compared with non-cirrhotic patients (16.0 vs. 13.0 months, respectively; P<0.038). Multivariate analysis demonstrated that hepatitis B virus infection and cirrhosis were independent favorable prognostic factors, while the presence of cholelithiasis, elevated carbohydrate antigen 19-9 and carcinoembryonic antigen levels, multiple tumors, lymphatic metastasis, vascular invasion and positive surgical margin status were independent unfavorable prognostic factors. Overall, the clinicopathological characteristics of ICC patients with and without cirrhosis differed significantly. Compared with cirrhotic patients, in whom the biological behavior of ICC was similar to that of HCC, non-cirrhotic patients exhibited higher-risk pathological characteristics, lower curative resection rate and worse survival.

Hepatitis C and Risk of Nonhepatic Malignancies

Epidemiologic studies show an increased risk of mortality among hepatitis C virus (HCV)-infected individuals compared with uninfected individuals from hepatic and nonhepatic causes. This article reviews the biologic plausibility of and epidemiologic evidence for the association between HCV and five extrahepatic malignancies: cholangiocarcinoma (CCA), pancreatic adenocarcinoma, papillary thyroid cancer, oral squamous cell cancer, and renal/kidney cancer. There is sufficient evidence to suggest that HCV is associated with intrahepatic CCA. The evidence for the link between HCV and pancreatic adenocarcinoma, oral squamous cell cancer, and renal/kidney cancer is compelling but requires further study. Based on available studies, there is no significant association between HCV, extrahepatic CCA, and papillary thyroid cancer.

Epidemiology and risk factors: intrahepatic cholangiocarcinoma

Intrahepatic cholangiocarcinoma (ICC) is a rare entity with a distinct clinical course and epidemiology from hilar and extrahepatic cholangiocarcinoma. ICC makes up 8-10% of cholangiocarcinomas and 10-20% of all primary liver tumors. There remains a considerable amount of geographic variation in the incidence of ICC worldwide; however, the overall incidence of this malignancy appears to be rising. Several risk factors have been identified, such as infectious causes (liver flukes, viral hepatitis), biliary tract disease [primary sclerosing cholangitis (PSC), hepaticolithiasis, biliary cystic diseases], metabolic syndrome, lifestyle choices (alcohol abuse, tobacco use), and cirrhosis. Despite this, a substantial number of ICC patients do not have any identifiable risk factors, underlining the need for further work into the pathogenesis of this malignancy.

Glasgow Prognostic Score predicts prognosis of intrahepatic cholangiocarcinoma

High Glasgow Prognostic Score (GPS) has been associated with poor prognosis in patients with lung, ovarian, colorectal and renal cancer, as well as hepatocellular carcinoma. The aim of this study was to investigate the prognostic value of GPS in patients with intrahepatic cholangiocarcinoma (ICC) undergoing partial hepatectomy. A total of 72 patients with pathologically confirmed ICC were classified according to their GPS scores assigned based on the preoperative levels of C-reactive protein (CRP) and albumin. Their clinicopathological data were retrospectively assessed using univariate and multivariate analysis to determine their association with overall survival and recurrence. High GPS scores in ICC patients were associated with preoperative levels of CRP (P<0.001) and albumin (P<0.001), frequency of ascites accumulation (P=0.035), lymph node metastasis (P=0.002) and tumour size (P=0.005). On univariate analysis, preoperative levels of CRP (P<0.001), albumin (P=0.016) and carbohydrate antigen 19-9 (P=0.038), hepatitis B virus (HBV) positivity (P=0.009), occurrence of lymph node metastasis (P=0.001), Child-Pugh class B (P=0.013) and high tumour-node-metastasis (TNM) stage (P=0.002) were found to be associated with the 1- and 3-year overall survival. Multivariate analysis suggested that GPS score (HR=2.037, 95% CI: 1.092-3.799, P=0.025), TNM classification (HR=2.000, 95% CI: 1.188-3.367, P=0.009) and HBV positivity (HR=0.559 95% CI: 0.328-0.953, P=0.032) were independently associated with patient survival. High GPS scores also predicted ICC recurrence. In conclusion, our results demonstrated that GPS may serve as an independent marker of prognosis in patients with ICC following partial hepatectomy.

Hepatitis C virus infection and the risk of cancer among elderly US adults: A registry-based case-control study

BACKGROUND

Hepatitis C virus (HCV) infection causes hepatocellular carcinoma (HCC) and subtypes of non-Hodgkin lymphoma (NHL). Associations with other cancers are not established. The authors systematically assessed associations between HCV infection and cancers in the US elderly population.

METHODS

This was a registry-based case-control study using Surveillance, Epidemiology, and End Results (SEER)-Medicare data in US adults aged ≥66 years. Cases (n = 1,623,538) were patients who had first cancers identified in SEER registries (1993-2011). Controls (n = 200,000) were randomly selected, cancer-free individuals who were frequency-matched to cases on age, sex, race, and calendar year. Associations with HCV (documented by Medicare claims) were determined using logistic regression.

RESULTS

HCV prevalence was higher in cases than in controls (0.7% vs 0.5%). HCV was positively associated with cancers of the liver (adjusted odds ratio [aOR] = 31.5; 95% confidence interval [CI], 29.0-34.3), intrahepatic bile duct (aOR, 3.40; 95% CI, 2.52-4.58), extrahepatic bile duct (aOR, 1.90; 95% CI, 1.41-2.57), pancreas (aOR, 1.23; 95% CI, 1.09-1.40), and anus (aOR, 1.97; 95% CI, 1.42-2.73); nonmelanoma nonepithelial skin cancer (aOR, 1.53; 95% CI, 1.15-2.04); myelodysplastic syndrome (aOR, 1.56; 95% CI, 1.33-1.83); and diffuse large B-cell lymphoma (aOR, 1.57; 95% CI, 1.34-1.84). Specific skin cancers associated with HCV were Merkel cell carcinoma (aOR, 1.92; 95% CI, 1.30-2.85) and appendageal skin cancers (aOR, 2.02; 95% CI, 1.29-3.16). Inverse associations were observed with uterine cancer (aOR, 0.64; 95% CI, 0.51-0.80) and prostate cancer (aOR, 0.73; 95% CI, 0.66-0.82). Associations were maintained in sensitivity analyses conducted among individuals without documented alcohol abuse, cirrhosis, or hepatitis B or human immunodeficiency virus infections and after adjustment for socioeconomic status. Associations of HCV with other cancers were not observed.

CONCLUSIONS

HCV is associated with increased risk of cancers other than HCC in the US elderly population, notably bile duct cancers and diffuse large B-cell lymphoma. These results support a possible etiologic role for HCV in an expanded group of cancers. Cancer 2017;123:1202-1211. © 2016 American Cancer Society.

A potential association between exposure to hepatitis B virus and small bowel adenocarcinoma

Chronic infection with hepatitis B virus (HBV) has never been described as a risk factor for small bowel adenocarcinoma, although infection is a known risk factor for hepatocellular carcinoma. From May 2009 to December 2014, we implemented an institution-wide screening program for hepatitis B viral serologies prior to starting chemotherapy. Evidence of exposure [hepatitis B core antibody (anti-HBc) positivity in the absence of hepatitis B surface antigen (HBsAg) positivity] was highest in patients with hepatocellular carcinoma (21.1%), followed by small bowel cancer (12.5%). The small bowel adenocarcinoma cases with anti-HBc positivity were reviewed. Special attention was paid to known risk factors for small bowel cancers. One patient had a diagnosis of hereditary nonpolyposis colorectal cancer (HNPCC). However, the other patients had no genetic syndromes, history of inflammatory bowel disease or other chronic inflammation to explain their risk. We postulate exposure to bile acids, tumorigenesis of hepatocytes and cholangiocytes, and/or damage to the intestinal mucosa secondary to HBV exposure/infection as potential mechanisms for development of small bowel adenocarcinoma. More research is warranted to further elucidate this association.

Possible association between hepatitis C virus and malignancies different from hepatocellular carcinoma: A systematic review

AIM: To summarize the current knowledge about the potential relationship between hepatitis C virus (HCV) infection and the risk of several extra-liver cancers.

METHODS: We performed a systematic review of the literature, according to the Preferred Reporting Items for Systematic reviews and Meta-Analysis (PRISMA) Statement. We extracted the pertinent articles, published in MEDLINE and the Cochrane Library, using the following search terms: neoplasm/cancer/malignancy/tumor/carcinoma/adeno-carcinoma and non-Hodgkin lymphomas, kidney/renal-, cholangio-, pancreatic-, thyroid-, breast-,oral-, skin-, prostate-, lung-, colon-, stomach-, haematologic. Case series, case-series with control-group, case-control, cohort-studies as well as meta-analyses, written in English were collected. Some of the main characteristics of retrieved trials, which were designed to investigate the prevalence of HCV infection in each type of the above-mentioned human malignancies were summarised. A main table was defined and included a short description in the text for each of these tumours, whether at least five studies about a specific neoplasm, meeting inclusion criteria, were available in literature. According to these criteria, we created the following sections and the corresponding tables and we indicated the number of included or excluded articles, as well as of meta-analyses and reviews: (1) HCV and haematopoietic malignancies; (2) HCV and cholangiocarcinoma; (3) HCV and pancreatic cancer; (4) HCV and breast cancer; (5) HCV and kidney cancer; (6) HCV and skin or oral cancer; and (7) HCV and thyroid cancer.

RESULTS: According to available data, a clear correlation between regions of HCV prevalence and risk of extra-liver cancers has emerged only for a very small group of types and histological subtypes of malignancies. In particular, HCV infection has been associated with: (1) a higher incidence of some B-cell Non-Hodgkin-Lymphoma types, in countries, where an elevated prevalence of this pathogen is detectable, accounting to a percentage of about 10%; (2) an increased risk of intra-hepatic cholangiocarcinoma; and (3) a correlation between HCV prevalence and pancreatic cancer (PAC) incidence.

CONCLUSION: To date no definitive conclusions may be obtained from the analysis of relationship between HCV and extra-hepatic cancers. Further studies, recruiting an adequate number of patients are required to confirm or deny this association.

Hepatitis C virus infection and the risk of intrahepatic cholangiocarcinoma and extrahepatic cholangiocarcinoma: evidence from a systematic review and meta-analysis of 16 case-control studies

Background

Studies investigating the association between hepatitis C virus (HCV) infections and the occurrence of cholangiocarcinoma (CCA), especially intrahepatic cholangiocarcinoma (ICC), have shown inconsistent findings. Although previous meta-analyses referred to HCV and CCA, they mainly focused on ICC rather than CCA or extrahepatic cholangiocarcinoma (ECC). Since then, relevant new studies have been published on the association between HCV and ICC. Since the different anatomic locations of CCA have distinct epidemiologic features and different risk factors, it is necessary to evaluate the relationship between HCV infection and ICC, ECC, and CCA.

Methods

Relevant studies were identified by searching PUBMED, EMBASE, and MEDLINE databases prior to 1 August 2013. Pooled risk estimates were calculated with random-effects models using STATA 11.0.

Results

A total of 16 case-control studies were included in the final analysis. Pooled risk estimates showed a statistically significant increasing risk of CCA (odds ratio (OR) = 5.44, 95% CI, 2.72 to 10.89). The pooled risk estimate of ICC (OR = 3.38, 95% CI, 2.72 to 4.21) was higher than that of ECC (OR = 1.75, 95% CI, 1.00 to 3.05). In a subgroup analysis, the pooled risk estimate of ICC in studies from North America was obviously higher than in Asia (6.48 versus 2.01). The Begg funnel plot and Egger test showed no evidence of publication bias.

Conclusions

HCV infection is associated with the increasing risk of CCA, especially ICC.

Hepatitis C virus infection of cholangiocarcinoma cell lines

Hepatitis C virus (HCV) infects the liver and hepatocytes are the major cell type supporting viral replication. Hepatocytes and cholangiocytes derive from a common hepatic progenitor cell that proliferates during inflammatory conditions, raising the possibility that cholangiocytes may support HCV replication and contribute to the hepatic reservoir. We screened cholangiocytes along with a panel of cholangiocarcinoma-derived cell lines for their ability to support HCV entry and replication. While primary cholangiocytes were refractory to infection and lacked expression of several entry factors, two cholangiocarcinoma lines, CC-LP-1 and Sk-ChA-1, supported efficient HCV entry; furthermore, Sk-ChA-1 cells supported full virus replication. In vivo cholangiocarcinomas expressed all of the essential HCV entry factors; however, cholangiocytes adjacent to the tumour and in normal tissue showed a similar pattern of receptor expression to ex vivo isolated cholangiocytes, lacking SR-BI expression, explaining their inability to support infection. This study provides the first report that HCV can infect cholangiocarcinoma cells and suggests that these heterogeneous tumours may provide a reservoir for HCV replication in vivo.

Association of metabolic syndromes and risk factors with ampullary tumors development: A case-control study in China

AIM: To evaluate the risk factors for ampullary adenoma and ampullary cancer.

METHODS: This case-control study included ampullary tumor patients referred to Peking Union Medical College Hospital. Controls were randomly selected from an existing database of healthy individuals at the Health Screening Center of the same hospital. Data on metabolic syndromes, medical conditions, and family history were collected by retrospective review of the patients’ records and health examination reports, or by interview.

RESULTS: A total of 181 patients and 905 age- and sex-matched controls were enrolled. We found that a history of diabetes, cholecystolithiasis, low-density lipoprotein, and apolipoprotein A were significantly related to ampullary adenomas. Diabetes, cholecystolithiasis, chronic pancreatitis, total cholesterol, high-density lipoprotein, and apolipoprotein A were also significantly related to ampullary cancer.

CONCLUSION: Some metabolic syndrome components and medical conditions are potential risk factors for the development of ampullary tumors. Cholelithiasis, diabetes, and apolipoprotein A may contribute to the malignant transformation of benign ampullary adenomas into ampullary cancer.

The long-term outcomes after curative resection for mass-forming intrahepatic cholangiocarcinoma associated with hepatitis C viral infection: a multicenter analysis by Osaka Hepatic Surgery Study Group

BACKGROUND AND OBJECTIVES

Hepatitis C virus (HCV) infection plays an important role in the development of not only hepatocellular carcinoma (HCC) but also intrahepatic cholangiocarcinoma (ICC). The aim of this study was to identify the specific characteristics of HCV-related ICC.

METHODS

Of 90 patients who underwent curative resection for mass-forming ICC, 33 patients had chronic HCV infection. We examined the relationship between HCV infection and the clinicopathologic findings and surgical outcomes.

RESULTS

The incidence of simultaneous HCC was significantly higher in patients infected with HCV (30.3%) than in those without HCV infection (5.3%). Four patients were diagnosed with metachronous HCC after resection for HCV-related ICC. Patients with HCV infection had a significantly shorter overall survival time than patients without HCV infection, although there was no difference in ICC tumor-free survival rates between the two groups. Five HCC-related deaths occurred in patients with HCV infection, while none of patients without HCV infection died from HCC. Multivariate analysis indicated that HCV infection, tumor size >5 cm, multiple ICC tumors, and nodal metastases were predictors of poor prognosis in patients who underwent curative resection for mass-forming ICC.

CONCLUSIONS

HCV infection was an adverse prognostic factor after curative resection for mass-forming ICC.

Surgical treatment for intrahepatic cholangiocarcinoma

Despite surgical treatment for intrahepatic cholangiocarcinoma (ICC) becoming more widely available, the prognosis after hepatic resection for ICC remains poor. Because ICC is relatively rare, the TNM staging system for ICC was finally established in the 2000s. Resection margin status and lymph node metastases are important prognostic factors after surgery for ICC; however, the true impact of wide resection margins or lymph node dissection on postoperative survival is unclear. Although adjuvant chemotherapy can improve the postoperative prognosis of patients with various types of cancer, no standard regimen has been developed for ICC. Over 50 % of patients suffer postoperative recurrence, even after curative resection, and no effective treatment for recurrent ICC has been established. Therefore, despite advances in imaging studies and hepatobiliary surgery, significant challenges remain in improving the prognosis of patients with ICC.

Intrahepatic cholangiocarcinoma: relationship between tumor imaging enhancement by measuring attenuation and clinicopathologic characteristics

PURPOSE

Arterial enhancement of intrahepatic cholangiocarcinoma (ICC) has been noted. To precisely identify the characteristics of tumor enhancement patterns, we examined the relationship between CT attenuation in the tumor and clinicopathological parameters or prognosis.

METHODS

Subjects were 42 ICC patients who had undergone hepatectomy. microvessel density (MVD) determined by CD34 staining was compared with imaging. Attenuation was calculated in images from multidetector CT of tumor and non-tumorous regions. Enhancement patterns were divided into two groups: arterial enhancement with higher attenuation (>16 HU; Hyper group, n = 12); and arterial enhancement with lower attenuation (Hypo group, n = 30).

RESULTS

Univariate analysis identified high tumor marker level, increased size, less-differentiation, incomplete resection, increased bleeding, and lower MVD as significantly associated with poor survival (p < 0.05). Increased attenuation throughout the whole ICC correlated significantly with radiological findings and MVD. Concomitant hepatitis, well-differentiation, and smaller tumor were more significantly frequent in the Hyper group than in the Hypo group (p < 0.05). Postoperative early recurrence was significantly less frequent in the Hyper group, and overall survival was significantly better in the Hyper group (p < 0.05).

CONCLUSIONS

Increased CT attenuation correlated with ICC tumor vascularity. Increased tumor enhancement in the arterial phase was associated with chronic hepatitis, lower malignancy, and better survival.

The role of the hepatitis viruses in cholangiocarcinoma

Cholangiocarcinoma is the second most common liver cancer in the world. The aetiology of the disease is diverse incorporating a variety of conditions leading to biliary stasis, biliary and liver inflammation, but a large number of cases still occur in the absence of established risk factors. Its incidence and mortality is increasing, which has intensified the search for alternative aetiological agents and pathogenetic mechanisms. Chronic infection with hepatitis B and hepatitis C viruses are the primary risk factor for hepatocellular cancer. This review focuses on the epidemiological evidence of a role for these viruses in cholangiocarcinoma and the pathogenetic mechanisms that might be involved.

Treatment outcomes and prognostic factors of intrahepatic cholangiocarcinoma

The aim of the present study was to determine the treatment outcome and prognostic factors for survival in patients with peripheral intrahepatic cholangiocarcinoma (ICC). A retrospective chart review was performed for patients diagnosed with ICC between 2000 and 2009 at a single institution. We identified a total of 105 patients with ICC. Among them, 63.8% were older than 60 years of age, 50.5% were male and 88.6% were Caucasian. By preoperative imaging approximately half of the patients (50.5%) were surgical candidates and underwent resection. The other half of the patients (49.5%) were unresectable. The unresectable group received chemoradiotherapy (53%) and transarterial chemoembolization (7.7%) as palliative treatments while 23.0% of the patients (12/52) received best supportive care alone. The median survival rates were 16.1 months (13.1‑19.2) for the entire cohort, 27.6 months (17.7-37.6) for curative resection, 12.9 months (6.5-19.2) for palliative chemoradiotherapy and 4.9 months (0.4-9.6) for best supportive care (p<0.001). Independent predictors on multivariate analysis were advanced stage at diagnosis and treatment received. In those patients who underwent resection, advanced AJCC stage and presence of microvascular invasion were also independent predictors of poor survival. We concluded that surgery offers the most beneficial curative option and outcome, emphasizing the importance of resectability as a major prognostic factor. The present study also revealed that use of chemoradiotherapy in the adjuvant setting failed to improve survival but its palliative use in those patients with unresectable ICC offered a modest survival advantage over best supportive care. The overriding factors influencing outcome were stage and the presence of microvascular invasion on pathology.

The metabolic syndrome and risk factors for biliary tract cancer: a case-control study in China

OBJECTIVES

Recent data show that the metabolic syndrome may play a role in several cancers, but the etiology for biliary tract cancer is incompletely defined. The present aim was to evaluate risk factors for biliary tract cancer in China.

METHODS

A case-control study in which cases were biliary tract cancer patients referred to Peking Union Medical College Hospital (PUMCH). Controls were randomly selected from an existing database of healthy individuals at the Health Screening Center of PUMCH. Data on the metabolic syndrome, liver diseases, family history, and history of diabetes and hypertension were collected by retrospective review of the patients' records and health examination reports or by interview.

RESULTS

A total of 281 patients (102 intrahepatic cholangiocarcinoma (ICC), 86 extrahepatic cholangiocarcinoma (ECC) and 93 gallbladder carcinoma (GC)) and 835 age- and sex-matched controls were enrolled. HBsAg+/anti-HBc+ (P=0.002), history of diabetes (P=0.000), cholelithiasis (P=0.000), TC (P=0.003), and HDL (P=0.000) were significantly related to ICC. Cholelithiasis (P=0.000), Tri (P=0.001), LDL (P=0.000), diabetes (P=0.000), Apo A (P=0.000) and Apo B (P=0.012) were significantly associated with ECC. Diabetes (P=0.017), cholelithiasis (P=0.000) and Apo A (P=0.000) were strongly inversely correlated with GC.

CONCLUSION

Cholelithiasis, HBV infection and metabolic symptoms may be potential risk factors for the development of biliary tract cancer.

Peripheral intrahepatic cholangiocarcinoma occurring in patients without cirrhosis or chronic bile duct diseases: epidemiology and histopathology of distant nontumoral liver in 57 White patients

BACKGROUND/AIM

Peripheral intrahepatic cholangiocarcinoma (ICC) occurring mainly in the absence of cirrhosis represents an increasing subgroup of primary liver tumors in Western countries. Histopathologic changes in the non-neoplastic liver in this context are not well characterized.

PATIENTS AND METHODS

We assessed the clinical characteristics and histopathologic changes in the distant nontumoral liver of 57 consecutive White patients (34 men, mean age 59 years) referred to one medical and one surgical liver institution over a 16-year period who developed a peripheral ICC in the absence of cirrhosis or bile duct disease.

RESULTS

High alcohol consumption was observed in 11 patients (20%), 38 patients (66%) had a BMI of 25 kg/m or more, 22 patients (40%) had diabetes, two patients had hepatitis B virus infection, two others had hepatitis C virus infection, three patients had genetic hemochromatosis, and two patients had cutaneous porphyria tarda. The distant nontumoral liver was normal in 10 patients (18%). The two main histopathologic changes observed were macrovesicular steatosis (>10% of hepatocytes) in 38 patients (66%), including 11 patients (19%) with steatohepatitis, and moderate or intense hepatocyte iron overload in 22 patients (38%).

CONCLUSION

This study shows a high prevalence of macrovesicular steatosis associated or not with steatohepatitis and iron overload in patients who develop peripheral ICC in the absence of cirrhosis or bile duct disease.

Hepatitis B virus infection increases the risk of cholangiocarcinoma: a meta-analysis and systematic review

BACKGROUND AND AIM

A number of studies have shown that hepatitis virus infections may be associated with cholangiocarcinoma (CC). However, the relationship between hepatitis B virus (HBV) infection and CC, especially intrahepatic cholangiocarcinoma (ICC), is still controversial.

METHODS

Relevant studies were identified by searching PUBMED, EMBASE and Web of Science Datebases up to September 2011. Pooled risk estimates were calculated using a random-effects model. Potential sources of heterogeneity were performed by subgroup analyses. A total of 18 papers were included in this meta-analysis.

RESULTS

The pooled risk estimate of all studies showed a statistically significant increased risk of CC among individuals with HBV infection (rate ratio [RR]: 2.66; 95% confidence interval [CI]: 1.97, 3.60). Compared with those without HBV infection, persons with HBV infection had an increased risk of intra-CC (ICC) (RR: 3.42; 95% CI: 2.46, 43.74), extrahepatic CC (OR: 1.46; 95% CI: 0.98, 2.17), and CC (OR: 2.03; 95% CI: 1.15, 3.56). In a subgroup analysis of HBV infection and risk of ICC, the pooled risk estimate of studies in Asians (RR: 3.63; 95% CI: 2.56, 5.13) was higher than that in non-Asians (RR: 1.93; 95% CI: 0.78, 4.76). A Begg funnel plot and Egger test revealed no evidence for publication bias.

CONCLUSIONS

This meta-analysis shows that HBV is associated with increased risk of CC, especially for ICC. Further investigation is needed to focus on the mechanism by which HBV may be involved in the pathogenesis of CC.

Occult HBV infection

The long-lasting persistence of hepatitis B virus (HBV) genomes in the liver (with detectable or undetectable HBV DNA in the serum) of individuals testing negative for the HBV surface antigen (HBsAg) is termed occult HBV infection (OBI). Although in a minority of cases the lack of HBsAg detection is due to infection with variant viruses unrecognized by available assays (S-escape mutants), the typical OBI is related to replication-competent HBVs strongly suppressed in their replication activity. The causes of HBV suppression are not yet well clarified, although the host's immune surveillance and epigenetic mechanisms are likely involved. OBI is a worldwide diffused entity, but the available data of prevalence in various categories of individuals are often contrasting because of the different sensitivity and specificity of the methods used for its detection in many studies. OBI may have an impact in several different clinical contexts. In fact, it can be transmitted (i.e., through blood transfusion and liver transplantation) causing classic forms of hepatitis B in newly infected individuals. The development of an immunosuppressive status (mainly by immunotherapy or chemotherapy) may induce OBI reactivation and development of acute and often severe hepatitis. Finally, evidence suggests that OBI can favor the progression of liver fibrosis, in particular in HCV-infected patients. The possible contribution of OBI to the establishment of cirrhosis also implies its possible indirect role in the development of hepatocellular carcinoma. On the other hand, OBI may maintain most of the direct transforming properties of the overt HBV infection, such as the capacity to integrate in the host's genome and to synthesize pro-oncogenic proteins.

Hepatitis viruses infection and risk of intrahepatic cholangiocarcinoma: evidence from a meta-analysis

Background

Studies investigating the association between Hepatitis B virus (HBV) and hepatitis C virus (HCV) infections and intrahepatic cholangiocarcinoma (ICC) have reported inconsistent findings. We conducted a meta-analysis of epidemiological studies to explore this relationship.

Methods

A comprehensive search was conducted to identify the eligible studies of hepatitis infections and ICC risk up to September 2011. Summary odds ratios (OR) with their 95% confidence intervals (95% CI) were calculated with random-effects models using Review Manager version 5.0.

Results

Thirteen case–control studies and 3 cohort studies were included in the final analysis. The combined risk estimate of all studies showed statistically significant increased risk of ICC incidence with HBV and HCV infection (OR = 3.17, 95% CI, 1.88-5.34, and OR = 3.42, 95% CI, 1.96-5.99, respectively). For case–control studies alone, the combined OR of infection with HBV and HCV were 2.86 (95% CI, 1.60-5.11) and 3.63 (95% CI, 1.86-7.05), respectively, and for cohort studies alone, the OR of HBV and HCV infection were 5.39 (95% CI, 2.34-12.44) and 2.60 (95% CI, 1.36-4.97), respectively.

Conclusions

This study suggests that both HBV and HCV infection are associated with an increased risk of ICC.

Histological and immunohistological findings in biliary intraepithelial neoplasia arising from a background of chronic biliary disease compared with liver cirrhosis of non-biliary aetiology

AIMS

Hitherto, biliary intraepithelial neoplasia (BilIN) has been described in chronic biliary disease but rarely in non-biliary liver cirrhosis (LC). Intraepithelial neoplasia of the pancreas shows alterations in the expression of cell cycle and mucin core proteins. The aim of this study was to evaluate BilIN and reactive biliary lesions in biliary disease and non-biliary LC.

METHODS AND RESULTS

BilIN was found in 51% (33 of 65) of liver tissue cases of biliary disease, and in 11% (34 of 310) of the LC group. Immunohistologically, MUC5AC, an 'early phase' protein, and Ki67, reflecting 'late phase' expression, were identified with increasing degrees of dysplasia in both groups, but that expression was significantly higher in the biliary disease group. 'Early phase' cell cycle proteins, p16 (decrease) and p21 (increase) altered in both biliary and LC groups with increasing degrees of dysplasia.

CONCLUSIONS

We found BilIN in the large bile ducts of hepatitis B virus- and hepatitis C virus-related LC as well as in cases related to a biliary aetiology. The LC group was significantly less likely to show changes in the expression of MUC5AC and proliferative activity than the biliary group. Alterations in p16 and p21 reflected increasing degrees of dysplasia in both groups.

Epidemiological survey of biomarkers of hepatitis virus in patients with extrahepatic cholangiocarcinomas

AIM

Hepatitis virus B and C (HBV and HCV) are suggested to be risk factors for intrahepatic cholangiocarcinoma (ICC), but whether they are risk factors for extrahepatic cholangiocarcinoma (ECC) is disputed. To test the biomarkers in patients with ECC and further elucidate the relationship of HBV or HCV infection with ECC risk, we conducted a retrospective survey on hepatitis virus markers in patients with ECC.

METHODS

A hospital-based case-control study was conducted to review prior infection with hepatitis virus and the seroprevalence of hepatitis virus markers in the patients with ECC or with benign biliary disease (BBD). HBV X antigen (HBxAg) was detected in the tissues by immunohistochemical staining.

RESULTS

A total of 305 patients with ECC and 480 with BBD were enrolled in this study. Compared with BBD patients, ECC patients had a higher prevalence of prior infection with HBV (6.2 vs 2.3%) and chronic HBV infection (9 vs 1.9%). The overall seropositive rate for HBV markers in the two groups was 22.6 versus 6% (P < 0.01) and for HBxAg detection it was 75 versus 26% (P < 0.001). The seroprevalence of anti-HCV was 4.3% in the EEC patients and 5.6% in BBD patients with no significant difference between them.

CONCLUSION

The high prevalence of HBV biomarkers in ECC strongly supports the notion that HBV infection may be a risk factor for ECC. The high frequency of HBxAg expression suggests its important role in the pathogenesis of bile duct neoplasm.

Detection of hepatitis B virus DNA in paraffin-embedded intrahepatic and extrahepatic cholangiocarcinoma tissue in the northern Chinese population

This study explored the importance of hepatitis B virus infection in cholangiocarcinoma pathogenesis in northern China. The clinical data of 66 patients with cholangiocarcinoma were analyzed. The hepatitis B virus gene was amplified using nested polymerase chain reaction, and the hepatitis B virus-related antigen was detected using immunohistochemistry in formalin-fixed, paraffin-embedded tissue from patients with intrahepatic cholangiocarcinoma (n = 23) and extrahepatic cholangiocarcinoma (n = 43). Hepatitis B surface antigen seropositivity was found in 52.2% (12/23) of intrahepatic cholangiocarcinoma cases and 13.9% (6/43) of extrahepatic cholangiocarcinoma cases. Hepatitis B virus DNA (X region) was detectable in 34.8% (8/23) of intrahepatic cholangiocarcinoma cases. Hepatitis B surface antigen and/or hepatitis B core antigen was detectable in 30.4% (7/23) of intrahepatic cholangiocarcinoma cases. All cases with detected viral protein were also positive for hepatitis B virus DNA. In contrast, no hepatitis B virus antigens or hepatitis B virus gene was detected in any of the 43 extrahepatic cholangiocarcinoma cases. Our findings strongly suggest that chronic hepatitis B virus infection is a significant risk factor for intrahepatic cholangiocarcinoma, but not for extrahepatic cholangiocarcinoma, in northern China. Hepatitis B virus infection is potentially independently associated with intrahepatic cholangiocarcinoma.

Hepatitis B virus infection and risk of intrahepatic cholangiocarcinoma and non-Hodgkin lymphoma: a cohort study of parous women in Taiwan

Few studies have evaluated the risk of cancers other than hepatocellular carcinoma associated with hepatitis B virus (HBV) infection. This study aimed to estimate incidence rates of intrahepatic cholangiocarcinoma (ICC) and non-Hodgkin lymphoma (NHL) and its major subtypes in a nationwide cohort of parous women and to assess their associations with chronic HBV infection. We conducted a cohort study including 1,782,401 pregnant Taiwanese women whose HBV serostatus was obtained from the National Hepatitis B Vaccination Registry. Newly diagnosed ICCs and NHLs were ascertained through data linkage with the National Cancer Registry. Risks of ICC and NHL were assessed using Cox proportional hazards regression models. After a mean of 6.91 years of follow-up, there were 18 cases of ICC and 192 cases of NHL, including 99 cases of diffuse large B-cell lymphoma (DLBCL). Incidence rates of ICC were 0.09 and 0.43 per 100,000 person-years, respectively, among women who were hepatitis B surface antigen (HBsAg)-seronegative and HBsAg-seropositive, showing an age-adjusted hazard ratio (HR(adj) ) (95% confidence interval [CI]) of 4.80 (1.88-12.20). The incidence rates of NHL overall for HBsAg-seronegative and HBsAg-seropositive women were 1.23 and 3.18 per 100,000 person-years, respectively, with an HR(adj) (95% CI) of 2.63 (1.95-3.54). Among NHL subtypes, HBsAg-seropositive women had an increased risk of DLBCL compared with those who were HBsAg-seronegative (incidence rates: 1.81 and 0.60 per 100,000 person-years, respectively; HR(adj) [95% CI]: 3.09 [2.06-4.64]). The significantly increased risk was not observed for other specific subtypes of NHL.

CONCLUSIONS

Chronic HBV infection was associated with an increased risk of ICC and DLBCL in women. Our data suggested a possible etiological role of HBV in the development of ICC and specific subtypes of NHL.

Risk factors for hilar cholangiocarcinoma: A case-control study in China

AIM: To study the association between hilar cholangiocarcinoma (HC) and pre-existing medical conditions.

METHODS: Three hundred and thirteen HC patients admitted to the Eastern Hepatobiliary Surgery Hospital (Shanghai, China) in 2000-2005 and 608 healthy controls were enrolled in this study. Association between HC and pre-existing medical conditions was studied with their adjusted odds ratio (OR) calculated by logistic regression analysis.

RESULTS: The prevalence of choledocholithiasis (adjusted OR = 2.704, P = 0.039), hepatolithiasis (adjusted OR = 3.278, P = 0.018), cholecystolithiasis (adjusted OR = 4.499, P < 0.0001), cholecystectomy (adjusted OR = 7.012, P = 0.004), biliary ascariasis (adjusted OR = 7.188, P = 0.001), liver fluke (adjusted OR = 10.088, P = 0.042) and liver schistosomiasis (adjusted OR = 9.913, P = 0.001) was higher in HC patients than in healthy controls.

CONCLUSION: Biliary tract stone disease (choledocholithiasis, hepatolithiasis, cholecystolithiasis) and parasitic liver disease (biliary ascariasis, liver fluke, liver schistosomiasis) are the risk factors for HC in Chinese population.

Evaluation of risk factors and clinicopathologic features for intrahepatic cholangiocarcinoma in Southern China: a possible role of hepatitis B virus

BACKGROUND

Recent efforts suggest an etiologic role of hepatitis B virus (HBV) infection in intrahepatic cholangiocarcinoma (ICC) and the involvement of hepatic progenitor cell in ICC development, without definitive conclusions. This case-control study was undertaken to investigate risk factors for ICC, and clinicopathological features of HBV-associated ICC were analyzed.

METHODS

The report comprised 98 patients with pathologically confirmed ICC and 196 healthy control subjects. Logistic regression was used to determine odds ratios and 95% confidence intervals. The sex and age distributions of HBV-related and unrelated ICC patients were compared respectively with those of 882 HBV-associated hepatocellular carcinoma patients from a random selection, and the clinicopathological data of 62 ICC patients with or without HBV infection undergoing surgical resection were compared.

RESULTS

There was an association between ICC and each of HBV infection, liver cirrhosis, hepatolithiasis, and liver fluke infestation with the odds ratios (95% confidence intervals) of 2.75 (1.27-5.95), 8.42 (2.50-28.37), 22.81 (7.16-72.68), and 3.55 (1.60-7.89), respectively, with a marked synergism of cirrhosis and HBV infection (20.67; 5.40-79.06). Compared with HBV-unrelated ICC patients, HBV-related ICC patients were more common in male and younger subjects, had a higher incidence of abnormal serum alfa-fetoprotein level, cirrhosis, and neutrophilic infiltration, and had a lower proportion of elevated carbohydrate antigen 19-9 (CA19-9) values.

CONCLUSIONS

The independent association of HBV infection with ICC, synergy between cirrhosis and HBV infection, and some clinicopathological similarities between HBV-related ICC and hepatocellular carcinoma suggests that both may share similar or common tumorigenic process and may possibly originate from malignant transformation of hepatic progenitor cell.

Cholangiocarcinoma: A position paper by the Italian Society of Gastroenterology (SIGE), the Italian Association of Hospital Gastroenterology (AIGO), the Italian Association of Medical Oncology (AIOM) and the Italian Association of Oncological Radiotherapy (AIRO)

The incidence of Cholangiocellular carcinoma (CCA) is increasing, due to a sharp increase of the intra-hepatic form. Evidence-ascertained risk factors for CCA are primary sclerosing cholangitis, Opistorchis viverrini infection, Caroli disease, congenital choledocal cist, Vater ampulla adenoma, bile duct adenoma and intra-hepatic lithiasis. Obesity, diabetes, smoking, abnormal biliary-pancreatic junction, bilio-enteric surgery, and viral cirrhosis are emerging risk factors, but their role still needs to be validated. Patients with primary sclerosing cholangitis should undergo surveillance, even though a survival benefit has not been clearly demonstrated. CCA is most often diagnosed in an advanced stage, when therapeutic options are limited to palliation. Diagnosis of the tumor is often difficult and multiple imaging techniques should be used, particularly for staging. Surgery is the standard of care for resectable CCA, whilst liver transplantation should be considered only in experimental settings. Metal stenting is the standard of care in inoperable patients with an expected survival >4 months. Gemcitabine or platinum analogues are recommended in advanced CCA whilst there are no validated neo-adjuvant treatments or second-line chemotherapies. Even though promising results have been obtained in CCA with radiotherapy, further randomized controlled trials are needed.

Risk factors for intrahepatic cholangiocarcinoma: a possible role of hepatitis B virus

There are several established risk factors for intrahepatic cholangiocarcinoma (ICC), namely primary sclerosing cholangitis, fibropolycystic liver disease, parasitic infection, intrahepatic biliary stones and chemical carcinogen exposure. However, the majority of patients with ICC do not have any of these risk factors. Therefore, identification of other risk factors is warranted for the prevention and early detection of ICC. We evaluated the risk factors for ICC in a large-scale cohort study in the province of Osaka, Japan. This retrospective cohort study included 154,814 apparently healthy individual blood donors, aged 40-64 years at the time of blood donation in the period 1991-1993. The average observation period was 7.6 years, resulting in 1.25 million person-years of observation. Incident ICC cases were identified by linking the blood-donor database to the records in the population-based cancer registry for the province. There were 11 incident ICC cases during follow-up, with an incidence rate of 0.88 per 100,000 person-years. Compared with subjects aged 40-49 years, the subjects aged 50-54 years and 55-59 years had a significantly higher risk for ICC (hazard ratio [HR] = 5.90; 95%CI:1.08-32.31 and 11.07; 95%CI:1.98-61.79, respectively). Compared with those with ALT level of 19 Karmen Units (KU) or less, subjects with ALT level of 40 KU or higher had a significantly higher risk for ICC (HR: 8.30; 95%CI:1.47-46.83). Compared with those who tested negative for both HBsAg and anti-HCV, those who tested HBsAg-positive had a significantly higher risk for ICC (HR: 8.56; 95%CI: 1.33-55.20). Our results suggest that HBV infection and liver inflammation are independently associated with ICC development. These findings need to be verified by further large cohort studies.

Hepatitis C virus core protein induces malignant transformation of biliary epithelial cells by activating nuclear factor-kappaB pathway

In an earlier study, we found that hepatitis C virus core protein, HCV-C, participated in the malignant transformation of HCV-C transfected normal human biliary epithelial (hBE) cells by activating telomerase. Here we further investigated the signaling of the malignant transformation.

METHODS

Reverse transcription-polymerase chain reaction (RT-PCR), western blotting and immunoprecipitation were used to analyze the expression of HCV-C, human telomerase reverse transcriptase (hTERT), nuclear factor-kappaB (NF-kappaB) and NF-kappaB inhibitor alpha (IkappaBalpha) genes and the phosphorylation level of IkappaBalpha protein. Electrophoretic mobility shift assays (EMSA) and NF-kappaB-linked luciferase reporter assays were carried out to measure NF-kappaB activity.

RESULTS

The expression of HCV-C and hTERT was detected only in HCV-C-transfected hBE (hBE-HCV-C) cells but not in vector-transfected or parental hBE cells. More NF-kappaB protein accumulated in nuclear extracts of hBE-HCV-C cells rather than in those of control cells, though total NF-kappaB protein level showed no difference among these cells. DNA binding activity of NF-kappaB and the NF-kappaB-linked luciferase activity were much higher in HCV-C-transfected hBE cells than those in vector- or non-transfected hBE cells. In addition, the IkappaBalpha phosphorylation level, but not the IkappaBalpha mRNA or protein levels, was increased after HCV-C transfection.

CONCLUSIONS

Hepatitis C virus core protein activates NF-kappaB pathway in hBE cells by increasing the phosphorylation of IkappaBalpha. The pathway may be responsible for HCV-C-induced malignant transformation of hBE cells.

Extensive biliary intraepithelial neoplasia (BilIN) and multifocal early intrahepatic cholangiocarcinoma in non-biliary cirrhosis

Biliary intraepithelial neoplasia (BilIN), a preneoplastic condition that may precede invasive intrahepatic cholangiocarcinoma (ICC), has been compared to pancreatic intraepithelial neoplasia (PanIN), a precursor lesion of pancreatic carcinoma. Biliary tract carcinoma development and progression is associated with several gene alterations, but BilIN lesions have yet to be studied in detail by molecular techniques. We describe a case of extensive intrahepatic biliary dysplasia, with lesions ranging from BilIN-1 to BilIN-3 lesions, and multifocal microscopic ICC in hepatitis C virus (HCV)- and alcohol-related cirrhosis. The small ICC foci had remained undetected prior to transplantation. Fluorescence in situ hybridization (FISH) analysis was performed on three foci of BilIN-3 lesions and on three microinvasive ICC foci with a combination of three FISH probes directed against genes frequently altered in pancreatic and biliary tract carcinomas. FISH analysis revealed a CDKNA2 heterozygous deletion in one BilIN-3 focus, and in one non-contiguous ICC focus, although the deletion was just above the chosen threshold. No deletions were detected in the genomic regions encoding TP53 and SMAD4. This report documents for the first time the development of multifocal ICC in the setting of extensive biliary dysplasia in a patient with three risk factors, HCV infection, alcohol abuse, and cirrhosis, and suggests heterogeneous carcinogenesis in ICC and possible involvement of the CDKNA2 gene.

Impact of hepatitis B virus infection on outcome following resection for intrahepatic cholangiocarcinoma

BACKGROUND

Little is known about the prognosis of intrahepatic cholangiocarcinoma (ICC) patients with hepatitis B virus (HBV) infection following surgical resection.

METHODS

The clinico-pathological data of 40 consecutive ICC patients including 29 patients with HBV infection were analyzed after surgical resection.

RESULTS

Of all 40 ICC patients, the overall 1-, 3-, 5-year survival rates and a median survival for 29 (74.4%) patients with current or previous HBV infection were 78.9%, 42.8%, 35.7%, and 32.0 months, respectively. Twenty-nine (74.4%) patients with HBV infection, represented by HBsAg(+) or anti-HBc(+), had a better prognosis than 10(25%) patients without HBV infection represented by all markers-negative. Compared with 10 (25%) patients without HBV infection, 11 (27.5%) ICC patients with HBsAg(+) had a better prognosis as well. Additionally, lymph node metastasis were identified as an independent predictors of poor overall survival on multivariate analysis in the study of all the 40 patients and 29 patients with HBV infection.

CONCLUSIONS

Patients with current or previous HBV infection, represented by HBsAg+ or anti-HBc+, had significantly better prognosis than patients without HBV infection. Patients with HBV infection should be distinguished from other ICC patients, because of their favorable outcome after surgery.

New insights on cholangiocarcinoma

Cholangiocarcinoma (CCA) is a devastating cancer arising from the neoplastic transformation of the biliary epithelium. It is characterized by a progressive increase in incidence and prevalence. The only curative therapy is radical surgery or liver transplantation but, unfortunately, the majority of patients present with advanced stage disease, which is not amenable to surgical therapies. Recently, proposed serum and bile biomarkers could help in the screening and surveillance of categories at risk and in diagnosing CCA at an early stage. The molecular mechanisms triggering neoplastic transformation and growth of biliary epithelium are still undefined, but significant progress has been achieved in the last few years. This review deals with the most recent advances on epidemiology, biology, and clinical management of CCA.

Epithelial-mesenchymal transition induced by hepatitis C virus core protein in cholangiocarcinoma

BACKGROUND

Cholangiocarcinoma (CC) is associated with chronic hepatitis C virus (HCV) infection. We investigated the effect of hepatitis C virus core protein (HCVc) on epithelial-mesenchymal transition (EMT) in CC and tried to identify its target trigger.

METHODS

First, we examined expression of HCVc and epithelial and mesenchymal markers in CC tissues. Then we transient-transfected HCVc gene into a CC cell line and examined expression of lysyl oxidase-like 2 (LOXL2) and epithelial and mesenchymal markers by quantitative real-time polymerase chain reaction (PCR) and Western blotting. Finally, LOXL2 gene silencing was shown in QBC939/HCVc cells by RNA interference (RNAi), and we further examined expression of epithelial and mesenchymal markers by quantitative real-time PCR and Western blotting.

RESULTS

Through immunohistochemical staining, the present study showed that HCVc is significantly associated with CC invasion and metastasis. In vitro study showed that HCVc expression induces EMT in CC cell line QBC939, and a mechanism through LOXL2 pathway is suggested. Expression of HCVc was significantly correlated with greater migratory and invasive potential of CC cells.

CONCLUSIONS

These observations indicate that HCVc plays a critical role in promoting invasion and metastasis of CC cells.

Risk factors for intrahepatic and extrahepatic cholangiocarcinoma: a case-control study in China

BACKGROUND/AIMS

The risk factors for cholangiocarcinoma are incompletely defined in China, especially for intrahepatic cholangiocarcinoma (ICC). We evaluated the risk factors for both ICC and extrahepatic cholangiocarcinoma (ECC).

METHODS

A case-control study in which cases were cholangiocarcinoma patients referred to Peking Union Medical College Hospital (PUMCH) between 1998 and 2008 and controls were healthy individuals. Controls were randomly selected from an existing database of healthy individuals at the Health Screening Center of PUMCH. Data on liver disease, family history, diabetes, smoking and drinking were collected by a retrospective review of the patients' records and health examination reports or by interview.

RESULTS

A total of 190 patients (61 ICC; 129 ECC) and 380 age- and sex-matched controls were enrolled. HBsAg (P<0.001) and anti-HBc without HBsAg (P=0.001) were significantly related to ICC. The adjusted odds ratios (OR) and 95% confidence intervals (CI) were 18.1 (95% CI: 7.5-44.0) and 3.6 (95% CI: 1.7-7.6) respectively. Diabetes mellitus (P=0.007), cholecystolithiasis (P=0.004) and previous cholecystectomy (P<0.001) were significantly associated with ECC. The prevalence of cirrhosis was higher in ICC than that in ECC (P<0.001). Furthermore, on excluding the ICC patients with cirrhosis, ICC patients showed significant independent associations with HBsAg (OR: 7.3; 95% CI: 3.1-17.2) and anti-HBc without HBsAg (OR: 2.4; 95% CI: 1.1-5.2).

CONCLUSION

Cirrhosis and chronic hepatitis B virus infection are risk factors for ICC, while cholecystolithiasis, diabetes and previous cholecystectomy are risk factors for ECC.