New Data for Investigational CRISPR/Cas9 Gene-Editing Therapy CTX001 for Severe Hemoglobinopathies Accepted for Oral Presentation at the 25th European Hematology Association (EHA) Congress

ZUG, Switzerland and CAMBRIDGE, Mass. and BOSTON, May 14, 2020 (GLOBE NEWSWIRE) -- CRISPR Therapeutics (Nasdaq: CRSP) and Vertex Pharmaceuticals Incorporated (Nasdaq: VRTX) today announced that new data from two ongoing Phase 1/2 clinical trials of the CRISPR/Cas9 gene-editing therapy CTX001 in severe hemoglobinopathies have been accepted for an oral presentation at the EHA Congress, which will take place virtually from June 11-14, 2020. 

An abstract posted online today includes 12 months of follow-up data for the first patient treated in the ongoing Phase 1/2 CLIMB-111 trial in transfusion-dependent beta thalassemia (TDT) and 6 months of follow-up data for the first patient treated in the ongoing Phase 1/2 CLIMB-121 trial in severe sickle cell disease (SCD). Updated data will be presented at EHA, including longer duration follow-up data for the first two patients treated in these trials and initial data for the second patient treated in the CLIMB-111 trial.

The accepted abstract is now available on the EHA conference website: https://ehaweb.org/congress/eha25/key-information-2/.

Abstract Title: Initial Safety and Efficacy Results With a Single Dose of Autologous CRISPR-Cas9 Modified CD34+ Hematopoietic Stem and Progenitor Cells in Transfusion-Dependent β-Thalassemia and Sickle Cell Disease
Session Title: Immunotherapy - Clinical
Abstract Code: S280

About the Phase 1/2 Study in Transfusion-Dependent Beta Thalassemia
The ongoing Phase 1/2 open-label trial, CLIMB-Thal-111, is designed to assess the safety and efficacy of a single dose of CTX001 in patients ages 18 to 35 with TDT. The study will enroll up to 45 patients and follow patients for approximately two years after infusion. Each patient will be asked to participate in a long-term follow-up study.

About the Phase 1/2 Study in Sickle Cell Disease
The ongoing Phase 1/2 open-label trial, CLIMB-SCD-121, is designed to assess the safety and efficacy of a single dose of CTX001 in patients ages 18 to 35 with severe SCD. The study will enroll up to 45 patients and follow patients for approximately two years after infusion. Each patient will be asked to participate in a long-term follow-up study.

About CTX001
CTX001 is an investigational ex vivo CRISPR gene-edited therapy that is being evaluated for patients suffering from TDT or severe SCD in which a patient’s hematopoietic stem cells are engineered to produce high levels of fetal hemoglobin (HbF; hemoglobin F) in red blood cells. HbF is a form of the oxygen-carrying hemoglobin that is naturally present at birth and is then replaced by the adult form of hemoglobin. The elevation of HbF by CTX001 has the potential to alleviate transfusion requirements for TDT patients and painful and debilitating sickle crises for SCD patients. CTX001 is the most advanced gene-editing approach in development for beta thalassemia and SCD.