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A World First: Human Liver Was Treated in a Machine and Then Successfully Transplanted

Marc Brousseau by Marc Brousseau
June 1, 2022
in Health
A A
A World First: Human Liver Was Treated in a Machine and Then Successfully Transplanted

Prof. Pierre-Alain Clavien and Prof. Philipp Dutkowski during the transplantation of the liver treated in the machine. © USZ

The Liver4Life research team owes its perfusion machine, which was developed in-house, to the fact that it became possible to implant a human organ into a patient after a storage period of three days outside a body. The machine mimics the human body as accurately as possible, in order to provide ideal conditions for the human livers. A pump serves as a replacement heart, an oxygenator replaces the lungs and a dialysis unit performs the functions of the kidneys. In addition, numerous hormone and nutrient infusions perform the functions of the intestine and pancreas. Like the diaphragm in the human body, the machine also moves the liver to the rhythm of human breathing. In January 2020, the multidisciplinary Zurich research team – involving the collaboration of the University Hospital Zurich (USZ), ETH Zurich, and the University of Zurich (UZH) – demonstrated for the first time that perfusion technology makes it possible to store a liver outside the body for several days (see press release of January 13, 2020).

From poor to good in three days

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The team prepared the liver in the machine with various drugs. In this way, it was possible to transform the liver into a good human organ, even though it was originally not approved for transplantation due to its poor quality. The multi-day perfusion, i.e. the mechanical circulation of the organ, enables antibiotic or hormonal therapies or the optimization of liver metabolism, for example. In addition, lengthy laboratory or tissue tests can be carried out without time pressure. Under normal circumstances, this is not possible because organs can only be stored for 12 hours if they are stored conventionally on ice and in commercially available perfusion machines.

Treatment attempt successful

As part of an approved individual treatment attempt, the doctors gave a cancer patient on the Swisstransplant waiting list the choice of using the treated human liver. Following his consent, the organ was transplanted in May 2021. The patient was able to leave the hospital a few days after the transplantation and is now doing well: “I am very grateful for the life-saving organ. Due to my rapidly progressing tumor, I had little chance of getting a liver from the waiting list within a reasonable period of time.”

Saving more lives

The article on the first transplantation of a liver prepared in a perfusion machine was published in one of the most renowned scientific journals, Nature Biotechnology, on May 31, 2022. “Our therapy shows that by treating livers in the perfusion machine, it is possible to alleviate the lack of functioning human organs and save lives,” explains Prof. Pierre-Alain Clavien, Director of the Department of Visceral Surgery and Transplantation at the University Hospital Zurich (USZ). Prof. Mark Tibbitt, Professor of Macromolecular Engineering at ETH Zurich, adds: “The interdisciplinary approach to solving complex biomedical challenges embodied in this project is the future of medicine. This will allow us to use new findings even more quickly for treating patients.”

The next step in the Liver4Life project is to review the procedure on other patients and to demonstrate its efficacy and safety in the form of a multicenter study. Its success would mean that in the future, liver transplantation, which usually constitutes an emergency procedure, would be transformed into a plannable elective procedure. At the same time, the next generation of machines is being developed. In addition, those involved in basic research continue to look for ways of treating other liver diseases outside the body with drugs, molecules, or hormones.

Liver4Life: a Wyss Zurich project

The Liver4Life project was launched in 2015 under the umbrella of the Wyss Zurich Translational Center (Wyss Zurich). It brings together the highly specialized technical know-how and biomedical knowledge of around ten medical professionals, biologists, and engineers. The project is being financed with donations from the initiator of Wyss Zurich, Dr. h.c. mult. Hansjörg Wyss.

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