We have the largest, deepest,

ex-vivo gene therapy
data set in the world.

our science

With more than a decade of expertise and over 500 patient-years of experience, we are driving the field forward and setting the standard for gene therapy. Our lentiviral vector (LVV) technology is applicable to a broad range of serious diseases and has the potential to provide transformative benefits.

We are focused on developing and delivering new therapies for severe genetic diseases that currently have limited or no treatment options. Our goal is to provide hope for a better life – and more bluebird days – for patients and their families. 

what sets us apart?

  • Largest and deepest ex-vivo gene therapy data set in the world
  • >500 patients-years of experience across all LVV gene therapy clinical studies
  • 170+ patients studied across 8 clinical trials with up to 7 years of follow-up

what is gene therapy?

Every living thing contains a genome, which is made up of genetic material known as DNA. DNA is organized into sections of information called genes that provide the cells in the body with the instructions that they need in order to function. Genetic diseases are caused by a mutation – or alteration – in one or more genes.

Gene therapy uses genetic material with the goal of changing the course of a disease by adding, deleting, or correcting a genetic mutation. Gene therapy is being studied for a number of diseases, including inherited diseases and cancers. Today, building on more than a century of research into the building blocks of DNA, there are an unprecedented number of clinical trials underway with gene therapies and some have already been approved by the US Food and Drug Administration (FDA).

By addressing diseases at their root cause, gene therapy has the potential to transform the treatment of many diseases.

hand-drawn illustration of DNA next to a plus sign

Our Approach to Gene Therapy 

bluebird bio’s investigational gene therapies are manufactured with a patient’s own hematopoietic – or blood – stem cells. A benefit of using a patient’s own stem cells is that there is no need to search for a donor. Our approach utilizes gene addition to introduce a functional gene into a patient’s own stem cells.

handdrawn illustration of DNA insertion

Our Treatment Process

The treatment process for ex vivo and other types of gene therapy involves close collaboration between the primary physician, the treatment team, the patient, and their caregivers. Treatment decisions are unique to every patient and every gene therapy, depending on factors such as the disease being treated, the risks and benefits of different treatment options, and the patient's health and short- and long-term goals.

Clinical Trials

We wouldn’t be here today without our ongoing collaboration with scientists, healthcare providers and most importantly, people with severe genetic diseases and their families and caregivers. Together, we are determined to build a brighter future for people living with severe genetic diseases.


View the bluebird bio development pipeline and explore our list of investigational gene therapy candidates at all development phases.
National Institutes of Health. Genetics Home Reference. Help me understand genetics.
Wirth T, Parker N, Ylä-Hertuala. History of gene therapy. Gene. 2013;525(2):162-169.
Food and Drug Administration. Approved Cellular and Gene Therapy Products.
Dunbar CE, High KA, Joung JK, Kohn DB, Ozawa K, Sadelain M. Gene therapy comes of age. Science. 2018;359(6372):eaan4672-eaan4672.
Negre O, Eggimann A-V, Beuzard Y, et al. Gene therapy of the β-hemoglobinopathies by lentiviral transfer of the βA(T87Q)-globin gene. Hum Gene Ther. 2016;27:148-165.
Morgan RA, Gray D, Lomova A, Kohn DB. Hematopoietic Stem Cell Gene Therapy: Progress and Lessons Learned. Cell Stem Cell. 2017;21(5):574-590.
Goswami R, Subramanian G, Silayeva L, et al. Gene therapy leaves a vicious cycle. Front Oncol. 2019;9:297.
Bone Marrow & Cancer Foundation. Your Transplant Journey. Available at: https://bonemarrow.org/images/documents/Your-Transplant-Journey---Bone-Marrow--Cancer-Foundation.pdf. Accessed April 2022.</https:>