In June 2020, Gray got some even more exciting news: the treatment seemed to be lasting. After nine months, she still had not suffered any sickle-cell pain attacks, nor did she need any further blood transfusions. Tests showed that 81 percent of her bone marrow cells were producing the good fetal hemoglobin, meaning that the gene edits were sustained.2 “High school graduations, college graduations, weddings, grandkids—I thought I wouldn’t see none of that,” she said after getting the news. “Now I’ll be there to help my daughters pick out their wedding dresses.”3 It was an amazing milestone:
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