Preventive Effect of Enoxaparin, Pentoxifylline and Ursodeoxycholic Acid to Radiation Induced Liver Toxicity

University of Magdeburg22 enrolled

Overview

To evaluate whether a combination regimen of pentoxifylline, ursodeoxycholic acid and enoxaparin provides a protective effect on the liver parenchyma after high dose rate (HDR) brachytherapy.

A preventive effect of pentoxifylline, ursodeoxycholic acid and low dose low molecular weight heparin on pathological processes in healthy tissue after irradiation is described in clinical studies on percutaneous liver irradiation and on bone marrow transplantation. However, data remains inconclusive. This exploratory study aims at assessing whether a protective effect of the combination of pentoxifylline, ursodeoxycholic acid and enoxaparin can be demonstrated in a limited number of patients with liver metastases of colorectal cancer after HDR brachytherapy. All patients receive a single fraction CT/MRI-guided HDR-brachytherapy of colorectal liver metastases using Iridium-192 as a standard therapy. The follow-up consists of 4 MRI controls of the abdomen using the hepatocyte-specific contrast agent Gd-EOB-DTPA (Primovist) after 3 days, 6 weeks, 3 months and 6 months as well as blood samples and a questionnaire taken the same time.Within the study, 22 patients are given low dose low molecular weight heparin, pentoxifylline and ursodeoxycholic acid for 8 weeks starting with the preinterventional day. Another 22 patient will receive the standard therapy without the medication. After completion of the follow-up, MRI volume data of the lesion will be acquired and compared to the dosimetric treatment plan. Blood samples are tested for liver-specific and inflammatory laboratory parameters.

Study Type

INTERVENTIONAL

Allocation

RANDOMIZED

Purpose

PREVENTION

Masking

NONE

Enrollment

Conditions

Colorectal Cancer Liver Metastases Irradiation Damage Radiation Induced Liver Disease

Interventions

PentoxifyllineDRUG

Pentoxifylline is given for 8 weeks since the evening of the day of intervention with a dose of 400mg applied three times daily (morning, noon, evening).

Ursodeoxycholic AcidDRUG

Ursodeoxycholic acid is administered for 8 weeks since the evening of the day of intervention. Dosage is 250mg given three times daily (morning, noon, evening).

EnoxaparinDRUG

Enoxaparin with a dose of 40mg is injected subcutaneously once a day for 8 weeks since the evening of the day of intervention after the HDR-brachytherapy.

Eligibility

Sex: ALLMin age: 18 YearsMax age: 80 Years

Medical Language ↔ Plain English

Inclusion Criteria: * Age 18 to 80 * If female, postmenopausal or surgically sterilized * Liver metastases from colorectal carcinoma scheduled for a CT/MRI-guided single-fraction interstitial HDR brachytherapy * Non-cirrhotic liver * Life expectancy longer than 6 months * willing and able to undergo all study procedures * Having voluntarily provided written and fully informed consent Exclusion Criteria: * Women who are pregnant, lactating or who are of childbearing potential * Liver cirrhosis * Hepatitis B * Hepatitis C * Patients being clinically unstable * Uncooperative, in the investigator's opinion * Having been previously enrolled in this study * Participating in another therapy-modulating clinical trial * Contraindication for MRI * Contraindication or hypersensitivity to one or more components of Gd-EOB-DTPA, Enoxaparin, Ursodeoxycholic acid and/or Pentoxifylline * Any prior irradiation therapy of the liver * Close affiliation with the investigational site; e.g. a close relative of the investigator * Severe coronary artery disease * Autoimmune diseases * Acute bacterial endocarditis * Active major bleedings and high rish of uncontrolled haemorrhage * Patients with severe or moderate renal impairment (GFR below 60 mL/min/1.73 m2 according to the MDRD or Cockroft-Gault formula, calculated from a creatinine value obtained within 1 week before each planned Primovist-enhanced MR examination)

Locations (1)

Clinic for Radiology and Nuclear Medicine

Magdeburg, Saxony-Anhalt, Germany

Outcomes

Primary Outcomes

HDR-brachytherapy isodose (measured in Gy) that corresponds to the metastases without enhancement of Gd-EOB-DTPA in MR imaging using an axial T1 THRIVE sequence.

The primary variable is the HDR-brachytherapy isodose that encloses liver tissue with a diminished uptake of the hepatocyte selective contrast agent GD-EOB-DTPA. By identifying the damaged volume in every layer of the axial T1 THRIVE image, 3D data can be calculated and correlated to a specific isodose when merged with the 3D irradiation treatment plan. Prior to brachytherapy, the baseline volume of the metastases will be measured instead of the liver tissue damaged by irradiation.

Time frame: One day prior to brachytherapy.

HDR-brachytherapy isodose (measured in Gy) that corresponds to the irradiated liver tissue without enhancement of Gd-EOB-DTPA in MR imaging using an axial T1 THRIVE sequence.

The primary variable is the HDR-brachytherapy isodose that encloses liver tissue with a diminished uptake of the hepatocyte selective contrast agent GD-EOB-DTPA. Liver tissue without enhancement of Gd-EOB-DTPA around the irradiated metastases is defined as damaged by irradiation. By identifying the irreversibly damaged volume in every layer of the axial T1 THRIVE image, 3D data can be calculated and correlated to a specific isodose when merged with the 3D irradiation treatment plan. Imaging up to 3 months after brachytherapy is mandatory for inclusion in the analysis.

Time frame: 3 days after brachytherapy.

HDR-brachytherapy isodose (measured in Gy) that corresponds to the irradiated liver tissue without enhancement of Gd-EOB-DTPA in MR imaging using an axial T1 THRIVE sequence.

The primary variable is the HDR-brachytherapy isodose that encloses liver tissue with a diminished uptake of the hepatocyte selective contrast agent GD-EOB-DTPA. Liver tissue without enhancement of Gd-EOB-DTPA around the irradiated metastases is defined as damage by irradiation. By identifying the irreversibly damaged volume in every layer of the axial T1 THRIVE image, 3D data can be calculated and correlated to a specific isodose when merged with the 3D irradiation treatment plan. Imaging up to 3 months after brachytherapy is mandatory for inclusion in the analysis.

Time frame: 6 weeks after brachytherapy.

Data from ClinicalTrials.gov

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Secondary Outcomes

Correlation between the HDR brachytherapy isodose that corresponds to damaged live tissue as defined by missing Gd-EOB-DTPA enhancement in MR imaging and liver-specific laboratory values.

To evaluate the relation between hepatocyte dysfunction by irradiation as assessed in GD-EOB-DTPA-enhanced MRI and changes in liver-specific and inflammatory laboratory values. The following laboratory values are included: * bilirubin * ASAT/ALAT * albumin * ChE * gamma-GT * GLDH * INR * fibrinogen * fibrin monomer * factor VIII * IL 2 + 6 * PAI * protein c + s * vWF * AT3

Time frame: One day prior to brachytherapy, 3 days, 6 weeks, 3 months and 6 months after brachytherapy.

Quality of live.

To evaluate the quality of live comparing both patient groups using the EQ-5D questionnaire and ECOG performance status.

Time frame: One day prior to brachytherapy, 3 days, 6 weeks, 3 months and 6 months after brachytherapy.

Safety of the study drugs.

To assess the safety of the combination regimen of pentoxifylline, low dose low molecular weight heparin, and ursodeoxycholic acid given after HDR brachytherapy.

Time frame: Up to 6 months after brachytherapy.