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Man given genetically modified pig heart dies

Noelyn Nassuuna by Noelyn Nassuuna
March 10, 2022
in News, World News
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Man given genetically modified pig heart dies

This handout photo released by the University of Maryland School of Medicine on January 10, 2022 shows surgeon Dr. Bartley Griffith (L) with patient David Bennett, Sr., who received a heart implant from a genetically modified pig, in Baltimore, Maryland, in January 2022. PHOTO/AFP

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By AFP

The first person to receive a heart transplant from a genetically modified pig has died two months after the medical milestone, the hospital that carried out the surgery said Wednesday.

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The procedure raised hopes that advances in cross-species organ donation could one day solve the chronic shortage of human organs available for donation, and the team behind the operation say they are “optimistic” about its future success.

David Bennett, 57, had received his transplant on January 7 and passed away March 8, the University of Maryland Medical System said in a statement.

“His condition began deteriorating several days ago. After it became clear that he would not recover, he was given compassionate palliative care. He was able to communicate with his family during his final hours,” the statement said.

Following surgery, the transplanted heart had performed very well for several weeks without any signs of rejection, the hospital added.

Bennett was able to spend time with family, participated in physical therapy, watched the Super Bowl and spoke often about wanting to go home to see his dog Lucky.

“He proved to be a brave and noble patient who fought all the way to the end. We extend our sincerest condolences to his family,” said Bartley Griffith, the surgeon who led the procedure.

Bennett came to the hospital in the eastern US state of Maryland in October 2021.

He was bedridden and placed on an emergency life support machine. He had been deemed ineligible for human transplant — a decision that is often taken when the recipient has very poor underlying health.

“We have gained invaluable insights learning that the genetically modified pig heart can function well within the human body while the immune system is adequately suppressed,” said Muhammad Mohiuddin, director of the university’s cardiac xenotransplantation program.

“We remain optimistic and plan on continuing our work in future clinical trials.”

Reporting in US media also revealed Bennett was convicted of stabbing a man several times in 1988, leaving the victim paralyzed and wheelchair bound before he died in 2005.

Medical ethicists hold that a person’s past criminal history should have no bearing on their future treatment.

Human organ shortage 
About 110,000 Americans are currently waiting for an organ transplant, and more than 6,000 patients die each year before getting one, according to official figures.

To meet demand, doctors have long been interested in so-called xenotransplantation, or cross-species organ donation, with experiments tracing back to the 17th century.

Early research focused on harvesting organs from primates — for example, a baboon heart was transplanted into a newborn known as “Baby Fae” in 1984, but she survived only 20 days.

More recently, attention has turned toward pigs. Today, pig heart valves are widely used in humans, and pig skin is grafted on human burn victims.

Pigs make for ideal donors because their organ size is similar to humans’, they grow rapidly and have large litters. They are also already raised as a food source, so there is less controversy surrounding their organs’ use compared to primates’.

Bennett’s donor pig belonged to a herd that had undergone genetic editing procedures.

Three genes that would have led to rejection of pig organs by humans were “knocked out,” as was a gene that would have led to excessive growth of pig heart tissue.

Six human genes responsible for human acceptance were inserted into the genome, for a total of 10 unique gene edits.

The editing was performed by Virginia-based biotech firm Revivicor, which also supplied the animals used in three recent pig-to-human kidney transplants.

But while those procedures were carried out on brain dead recipients as proof-of-concept experiments, the surgery on Bennett was the first to actually help a patient who went on to live after the procedure.

Noelyn Nassuuna

Noelyn Nassuuna

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