Long-term Function of Beta Cell Allografts in Non-uremic Type 1 Diabetic Patients

Summary

The present proof of concept study addresses the following specific aims:

The general objectives of this work are:

1. To increase and maintain the functional beta-cell mass after islet transplantation under a condition of low-dose tacrolimus
2. To co-investigate the potential of alternative sites for encapsulated beta-cells

Conditions

• Diabetes Mellitus, Type 1

Interventions

DRUG

ATG-MMF-TAC

ATG-fresenium for max 6 consecutive days depending on CD3 count, starting the day before transplantation. Tacrolimus levels for 2 years between 8-10 ng/ml. At year 2: randomization: group A: till 48 months: tacrolimus levels 8-10 ng/ml 48-60 months: tacrolimus levels 6-8 ng/ml group B: 24-36 months: 6-8 ng/ml 36-60 months: 4-6 ng/ml A subgroup of these patients will receive a sub clinical implant subcutaneous (total n=5) at the time of the first clinical implant in the liver.

DRUG

ATG-Rituximab-MMF-TAC

ATG-fresenium for max 6 consecutive days depending on CD3 count, starting the day before transplantation. Rituximab: the day before transplantation, day 5; 12 and 19 after implantation. Tacrolimus levels for 2 years between 8-10 ng/ml. At year 2: randomization: group A: till 48 months: tacrolimus levels 8-10 ng/ml 48-60 months: tacrolimus levels 6-8 ng/ml group B: 24-36 months: 6-8 ng/ml 36-60 months: 4-6 ng/ml A subgroup of these patients will receive a sub clinical implant, subcutaneous at the time of the first clinical implant in the liver.

DRUG

ATG-basilixumab-MMF-TAC

First transplantation: ATG-fresenium for max 6 consecutive days depending on CD3 count, starting the day before transplantation. Second transplantation: Basilixumab: the day before the second transplantation followed by 4days after transplantation. Tacrolimus levels for 2 years between 8-10 ng/ml. At year 2: randomization: group A: till 48 months: tacrolimus levels 8-10 ng/ml 48-60 months: tacrolimus levels 6-8 ng/ml group B: 24-36 months: 6-8 ng/ml 36-60 months: 4-6 ng/ml A subgroup of these patients will receive a sub clinical implant, subcutaneous at the time of the first clinical implant in the liver.

PROCEDURE

omentum

Two clinical implants: first in omentum followed by a clinical implant in the liver: In a group of 10 patients, a clinical implant in the omentum will be implanted. If random C-peptide levels \>= 0.5 ng/ml are measured at 2 months post-transplantation, a second omental implant will be done. If no clinical relevant beta cell graft function is measured, two intraportal implants will be given as a compassionate use procedure. An interim analysis after 5 patients has to shown clinical relevant function at month 2 in 3 out of 5 patients before the subsequent 5 patients can be transplanted in the omentum.

Sponsors & Collaborators

• AZ-VUB

  lead OTHER

Principal Investigators

• Bart Keymeulen, MD PhD · University Hospital Brussel

Study Design

Allocation

RANDOMIZED

Purpose

TREATMENT

Masking

NONE

Model

PARALLEL

Eligibility

Min Age

18 Years

Max Age

65 Years

Sex

ALL

Healthy Volunteers

No

Timeline & Regulatory

Start

2006-10-31

Primary Completion

2014-12-31

Completion

2014-12-31

Countries

• Belgium

Study Locations