The Associated Press reported that the treatment involved extracting cells from the girl’s own hip bone marrow. The cells were then seeded on a plastic base, and left for a week to multiply and grow. They grew into a windpipe, which was subsequently implanted on the girl, Hannah Warren, in a nine-hour surgery on April 9, AP reported.

Until her operation, the girl — who was born in South Korea in 2010 — had not been able to breathe or eat without medical assistance. She had spent her entire life in a Seoul hospital, awaiting death — until being transported to the United States for the experimental treatment.

Early prognosis is positive.

Doctors said Tuesday she will likely be able to lead a normal life, AP reported.