First CRISPR treatment for blood diseases shows early benefits in two patients

The first two patients to receive a CRISPR-based treatment for the inherited blood disorders sickle cell disease and beta thalassemia have benefited from the experimental therapy and experienced only temporary and treatable side effects, the companies developing the treatment announced on Tuesday.

The two patients, enrolled in a pair of ongoing clinical trials, have been free from blood transfusions and disease symptoms for a relatively short time, but the encouraging data offer hope that genome editing might one day offer a safe, durable cure for both blood diseases.