The Food and Drug Administration (FDA) has told bluebird bio (NASDAQ: BLUE) it can resume trials of its experimental gene therapy, LentiGlobin, after it determined the therapy wasn't responsible for a rare case of cancer diagnosed in a trial participant earlier this year. IMAGE SOURCE: GETTY IMAGES. Using a lentiviral vector, LentiGlobin inserts a modified gene in patients that allows them to produce enough adult hemoglobin to potentially eliminate or significantly reduce the need for transfusions. In February, bluebird bio halted LentiGlobin's sickle cell disease (SCD) and transfusion-dependent beta-thalassemia (β-thalassemia) trials after one patient was diagnosed with acute myeloid leukemia (AML). At the time, the news was particularly concerning given expectations for an FDA filing for approval in SCD as soon as 2022. In March, management's internal investigation suggested it's unlikely the patient developed AML because of LentiGlobin because the gene therapy's integration site, VAMP4, doesn't have a known association with AML, and there's an absence of "significant gene misregulation attributable to the insertion event." Apparently, the FDA agrees with those findings. Now that it has the regulatory green light, bluebird bio plans to resume its SCD and β-thalassemia trials as soon as possible. The company didn't specify if the delay will interfere with plans to apply for FDA approval of the therapy in SCD next year, but it did say it's on track to complete its rolling biologics license application with the FDA in transfusion-dependent β-thalassemia by mid-year. The news may also help the company accelerate commercialization efforts in Europe where LentiGlobin secured a conditional marketing authorization in β-thalassemia in 2020. 10 stocks we like better than bluebird bioWhen investing geniuses David and Tom Gardner have a stock tip, it can pay to listen. After all, the newsletter they have run for over a decade, Motley Fool Stock Advisor, has tripled the market.* David and Tom just revealed what they believe are the ten best stocks for investors to buy right now... and bluebird bio wasn't one of them! That's right -- they think these 10 stocks are even better buys. See the 10 stocks *Stock Advisor returns as of February 24, 2021 Todd Campbell owns shares of bluebird bio. His clients may or may not have a position. The Motley Fool recommends bluebird bio. The Motley Fool has a disclosure policy.Source