Hanmin Lee,
M.D.
Associate Professor & Chief, Division of Pediatric
Surgery
Director, Fetal Treatment Center

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Dr. Alfred de Lorimier, a pioneer in pediatric surgery and the founder of the Division of Pediatric Surgery at UCSF, has passed away.
Dr. Tippi MacKenzie is an Assistant Professor of Surgery at the UCSF Division of Pediatric Surgery and the Fetal Treatment Center. Dr. MacKenzie obtained her undergraduate degree in Biochemistry at Harvard, then came to the Bay Area for medical school at Stanford. She did her surgical residency at Brigham and Women's Hospital in Boston. During this time, she took three years to do research on fetal surgery and in utero stem cell transplantation at the Children's Hospital of Philadelphia. Following residency, she returned to CHOP for her clinical pediatric surgery fellowship.
Dr. MacKenzie's clinical interests include fetal surgery, advanced laparoscopy, and endocrine and biliary surgery.
Dr Tippi MacKenzie has an active laboratory and is a member of the Biomedical Sciences Program and the Institute for Regeneration Medicine. Her research focus is on mechanisms of tolerance induction following in utero stem cell transplantation.
Stem cell transplantation may hold the promise to treating many diseases before birth such as sickle cell anemia and muscular dystrophy. But first, researchers need to overcome many barriers, including rejection of stem cell transplants by the fetus. MacKenzie's lab recently discovered that mothers' T cells are responsible for rejecting the grafts and that this rejection may be avoided by using stem cells from the mother.
For years, surgeons have been seeking ways of operating on babies in the womb, reasoning that medical abnormalities are easier to address while the fetus is still developing. Now, for the first time, a large clinical trial has shown that fetal surgery can also benefit infants with non life-threatening conditions. The eight-year study, led by Dr. Diana Farmer, Chief of the Division of Pediatric Surgery at UCSF, reported in the New England Journal of Medicine, found that babies born with myelomeningocele, the most common form of spina bifida, a debilitating spinal abnormality, were twice as likely to walk and experienced fewer neurological problems with in utero repair versus standard post-natal repair. Dr. Farmer characterized it as a " huge game-changer for fetal surgery". Dr. Michael Harrison, who pioneered fetal surgery at UCSF, was a principal investigator on the trial before retiring.
UCSF researchers have tackled a decade-long scientific conundrum, and their discovery is expected to lead to significant advances in using stem cells to treat genetic diseases before birth. Through a series of mouse model experiments, the research team determined that a mother's immune response prevents a fetus from accepting transplanted blood stem cells, and yet this response can be overcome simply by transplanting cells harvested from the mother herself.
UCSF announces the formation of the Institute for Fetal and Neonatal Health symposium brings together clinicians and basic scientists involved in different aspects of development and fetal intervention.
As a gifted pianist in high school, Assistant Professor of Surgery Tippi MacKenzie, MD, spent every Saturday studying music at Julliard. This musical training was good preparation for her current work as a researcher and surgeon.
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