$BLUEThe commercial-stage biotech bluebird bio, Inc

. (NASDAQ:BLUE) added ~17% pre-market Monday after the company announced the FDA approval of its gene therapy Skysona to address the impact of a rare neurodegenerative disease called cerebral adrenoleukodystrophy (CALD). According to the late Friday press release, the drug, also known as elivaldogene autotemcel (eli-cel), will be indicated in the U.S. to slow the progression of neurologic dysfunction in boys aged 4-17 with early, active CALD. With the FDA approving Skysona under the agency’s accelerated approval pathway, BLUE has agreed to deliver long-term clinical data on the treatment to the regulator, including data from an ongoing long-term follow-up study and commercially treated patients. The company expects the drug to be commercially available by the end of 2022 at a list price of $3.0M. Concurrently, BLUE confirmed that the FDA had lifted the clinical hold on the eli-cel development program. In August, Cambridge, Massachusetts-based biotech won FDA approval for another gene therapy known as Zynteglo for β-thalassemia which it priced at $2.8M.