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Immunosuppression in Patients Undergoing Liver Transplantation for Hepatocellular Carcinoma

2014-07-23 21:35:42 | BioPortfolio

Summary

The purpose of this study is to determine the safety and efficacy of sirolimus-based immunosuppressive therapy in patients following orthotopic liver transplantation (OLT) for hepatocellular carcinoma (HCC), with regard to HCC recurrence-free patient survival.

Description

There are two major issues to face in patients who underwent liver transplantation for hepatocellular carcinoma (HCC). First, the patient requires adequate immunosuppressive medication to avoid rejection of its allograft. Second, the risk for HCC recurrence has to be reduced to a minimum.

To date, it is a wide spread argument that immunosuppressive agents for the reduction of allograft rejection are generally tumorogenic, or at least are permissive of cancer development although little is known about their tumorogenic effect. In clinical studies substantiated by experimental data, cyclosporin (CsA) enhances cancer cell growth characteristics and angiogenesis in tumors and inhibits DNA repair mechanisms, promoting their growth. In an experimental rat-model CsA promoted liver tumor recurrence and growth. In other experimental studies a higher proliferation rate of human hepatoma cells in the presence of tacrolimus was demonstrated.

Nevertheless not all immunosuppressive agents do necessarily promote tumor growth, and in fact, can have antineoplastic activities. Sirolimus, in immunosuppressive doses, has potent antiangiogenic properties that inhibit tumor growth. The antiangiogenetic mechanism is due to inhibition of vascular endothelial growth factor (VEGF) production and signaling to endothelial cells. Besides that, sirolimus directly blocks critical intracellular pathways (mTOR) and inhibits cell-cycle. Through increased E-cadherin expression on tumor cells, tumor metastasis can be reduced by increased tumor cell binding.

In this context it has to be mentioned that in mouse models where a transplant recipient also has a tumor, the pro-tumor effects of CsA are completely negated by sirolimus.

Especially HCC seems to be particularly sensitive to VEGF/angiogenesis, indicating a potential susceptibility to the action of sirolimus which could be shown by the group of E.K. Geissler and colleagues in Regensburg.

From a clinical perspective there is a recent pilot study from Kneteman et al. indicating that early conversion of immunosuppression from CNI to mTOR-inhibitors after OLT in HCC patients (n=21) with a "high risk" for tumor recurrence results in a tumor recurrence rate of only 19% and a 4-year over all survival of 83% in this group. Moreover, in the "low-risk" group (n=19) the 4-year tumor recurrence rate was only 1/19. Post-HCC recurrence survival was 15.5 months, which is marked improvement compared to currently published data. Although this study only reports on a small number of patients and is not controlled, it suggests the potential role for sirolimus to ameliorate tumor recurrence, leading to a more benign course of renewed tumor disease.

Among the most serious complications of immunosuppressive therapy in organ transplantation is the high risk of previous neoplasia recurrence, or the development of de novo cancer. HCC comprises 80-90 % of malignancies indicating OLT. Before the introduction of strict criteria for the enrollment of primary liver tumors, tumor recurrence led to poor mid- and long-term results. HCC thus has an unacceptable recurrence rate following OLT when the tumor exceeds 5 cm in size. ELTR data from 2003 showed a 5 year patient overall survival for hepatic malignancy (including more than 80% HCC in this group since 1997) of merely 53%, comparing poorly with data from non-cholestatic liver cirrhosis of 74% and even acute liver failure of 62%. Based on previous work, and a landmark publication in 1996 by Mazzaferro et al. many centers have restricted their indication for liver transplantation due to clinical criteria based on tumor size and number to the so-called ´Milan Criteria´.

Implementing these criteria, recent single center data show an improvement in both disease-free and overall survival following OLT for HCC. Nevertheless approximately 30% of patients in these studies who were thought to be within Milan Criteria before transplantation, proved by histopathological examination to have extended disease. This led to a dramatic decline in overall and disease-free survival, from 71-85% to 40-50%, and from 65-78% to 27-30%, respectively.

In total all preclinical and clinical observations have led us to the purpose that the use of sirolimus in HCC patients could improve survival after liver transplantation by decreasing tumor recurrence rate. Thus patients should experience less posttransplant problems with HCC recurrence, and therefore could expect a longer, and better quality of life.

Study Design

Allocation: Randomized, Control: Active Control, Endpoint Classification: Safety/Efficacy Study, Intervention Model: Parallel Assignment, Masking: Open Label, Primary Purpose: Treatment

Conditions

Hepatocellular Carcinoma

Intervention

CNI, MMF, Steroids, Aza etc. (mTOR inhibitor free), Sirolimus

Location

Regensburg University
Regensburg
Bavaria
Germany
93053

Status

Active, not recruiting

Source

University of Regensburg

Results (where available)

View Results

Links

Published on BioPortfolio: 2014-07-23T21:35:42-0400

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Medical and Biotech [MESH] Definitions

An adaptor protein, consisting of seven WD REPEATS along its length, that functions as a component of the MECHANISTIC TARGET OF RAPAMYCIN COMPLEX 1 and MTORC2 COMPLEX. It interacts directly with MTOR to enhance its kinase activity and stabilizes the MTOR-RPTOR PROTEIN interaction in nutrient-poor conditions, favoring RPTOR inhibition of MTOR activity.

A multiprotein complex consisting of MTOR KINASE; MLST8 PROTEIN; rapamycin-insensitive companion of mTOR protein (RICTOR PROTEIN); and PRR5 (proline-rich protein 5). Like MTORC1, it also regulates cell growth and proliferation in response to growth factors but may not be as sensitive to nutrient availability and is insensitive to SIROLIMUS. In contrast to MTORC1, it can regulate the ACTIN CYTOSKELETON through RHO GTPASES to promote the formation of STRESS FIBERS. The mTORC2 complex also plays a critical role in AKT1 PROTEIN KINASE phosphorylation and activation.

An ORTHOHEPADNAVIRUS causing chronic liver disease and hepatocellular carcinoma in woodchucks. It closely resembles the human hepatitis B virus.

A macrolide compound obtained from Streptomyces hygroscopicus that acts by selectively blocking the transcriptional activation of cytokines thereby inhibiting cytokine production. It is bioactive only when bound to IMMUNOPHILINS. Sirolimus is a potent immunosuppressant and possesses both antifungal and antineoplastic properties.

An evolutionarily conserved multiprotein complex that functions as a cellular energy sensor and regulator of protein synthesis for cell growth and proliferation. It consists of TOR SERINE-THREONINE KINASES; REGULATORY-ASSOCIATED PROTEIN OF MTOR (RAPTOR); MLST8 PROTEIN; and AKT1 substrate 1 protein. The activity of the complex is regulated by SIROLIMUS; INSULIN; GROWTH FACTORS; PHOSPHATIDIC ACIDS; some amino acids or amino acid derivatives, and OXIDATIVE STRESS.

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