On November 5, 2024 bluebird bio, Inc. (Nasdaq: BLUE) reported that new and updated data from its lentiviral vector (LVV) gene addition programs in patients with sickle cell disease who have a history of vaso-occlusive events and patients with beta-thalassemia who require regular blood transfusions will be presented at the 66th American Society of Hematology (ASH) (Free ASH Whitepaper) Annual Meeting and Exposition (Press release, bluebird bio, NOV 5, 2024, View Source [SID1234647721]). The meeting will take place December 7-10, 2024 at the San Diego Convention Center and online.
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"The data to be presented at ASH (Free ASH Whitepaper) 2024 continue to underscore the transformative, long-term potential of bluebird’s gene therapies," said Richard Colvin, M.D., Ph.D., chief medical officer, bluebird bio. "Our programs continue to be the most deeply studied in the field, now with up to a decade of follow-up in patients with transfusion-dependent beta-thalassemia and almost ten years of follow-up in patients with sickle cell disease. We especially look forward to the first ever focused sub-analysis of lovo-cel’s clinical impact on patients with a history of stroke, which is unique among gene therapies for sickle cell disease."
bluebird bio will present updated follow-up data and analysis of early predictors and response to lovotibeglogene autotemcel (lovo-cel) in patients from HGB-206 and HGB-210 studies, demonstrating consistent clinical outcomes as early as six months post infusion and continued durability of clinical benefit of lovo-cel.
An integrated analysis of lovo-cel in patients with sickle cell disease with a history of stroke, including overt stroke from the HBG-206 Group A and Group C studies and silent stroke from the HGB-206 and HGB-210 studies, will also be presented. The data demonstrate clinical benefit in patients with a history of stroke and consistent outcomes with the overall lovo-cel treated population.
The lovo-cel treatment regimen safety profile reflects the known effects of underlying sickle cell disease and myeloablative conditioning and is similar across age groups.
The company will also present updated long-term analyses of efficacy, safety, and health related quality of life data of betibeglogene autotemcel (beti-cel) in patients with transfusion-dependent beta-thalassemia (TDT). Data from the long term follow up study of up to ten years reveals patients with TDT achieved durable transfusion independence and normal or near-normal hemoglobin, regardless of genotype and age, with a favorable long-term safety profile.
Sickle Cell Disease Data
Oral Presentation [#511]: An Update on Lovotibeglogene Autotemcel (lovo-cel) Clinical Trials for Sickle Cell Disease (SCD) and Analysis of Early Predictors of Response to Lovo-cel
Presenting Author: Dr. Stacey Rifkin-Zenenberg (Hackensack)
Date/Time: Sunday, December 8, 2024, 9:30 a.m. – 11:00 a.m. PT
Poster Presentation [#3576]: Participants with a History of Stroke in Lovotibeglogene Autotemcel (lovo-cel) Clinical Trials
Presenting Author: Dr. Jen Jaroscak (MUSC)
Date/Time: Sunday, December 8, 2024, 6:00 p.m. – 8:00 p.m. PT
Beta-Thalassemia Data
Poster Presentation [#2194]: Betibeglogene Autotemcel (beti-cel) Gene Addition Therapy results in durable Hemoglobin A (HbA) Production with up to 10 Years of Follow-Up in Participants with Transfusion-Dependent β-Thalassemia
Presenting Author: Dr. Alexis A Thompson (CHOP)
Date/Time: Saturday, December 7, 2024, 5:30 p.m. – 7:30 p.m. PT
Abstracts outlining bluebird bio’s accepted data at ASH (Free ASH Whitepaper) 2024 are available on the ASH (Free ASH Whitepaper) conference website.
Lovo-cel was approved by the U.S. Food and Drug Administration (FDA) in December 2023 and is commercially available in the United States as LYFGENIA. Beti-cel was approved by the FDA in August 2022 and is commercially available in the United States as ZYNTEGLO.
About LYFGENIA (lovotibeglogene autotemcel) or lovo-cel
LYFGENIA is a one-time ex-vivo lentiviral vector gene therapy approved for the treatment of patients 12 years of age or older with sickle cell disease and a history of vaso-occlusive events (VOEs). LYFGENIA works by adding a functional β-globin gene to patients’ own hematopoietic (blood) stem cells (HSCs). Durable production of adult hemoglobin with anti-sickling properties (HbAT87Q) is possible following successful engraftment. HbAT87Q has a similar oxygen-binding affinity to wild-type HbA, limits sickling of red blood cells and has the potential to reduce VOEs.
The Phase 1/2 HGB-206 study of LYFGENIA is complete and the Phase 3 HGB-210 study evaluating LYFGENIA is ongoing. bluebird bio is also conducting a long-term safety and efficacy follow-up study (LTF-307) for patients with sickle cell disease who have been treated with LYFGENIA in bluebird bio-sponsored clinical studies.
Indication
LYFGENIA is indicated for the treatment of patients 12 years of age or older with sickle cell disease and a history of vaso-occlusive events (VOEs).
Limitations of Use
Following treatment with LYFGENIA, patients with α-thalassemia trait (-α3.7/-α3.7) may experience anemia with erythroid dysplasia that may require chronic red blood cell transfusions. LYFGENIA has not been studied in patients with more than two α-globin gene deletions.
Important Safety Information
Boxed WARNING: HEMATOLOGIC MALIGNANCY
Hematologic malignancy has occurred in patients treated with LYFGENIA. Monitor patients closely for evidence of malignancy through complete blood counts at least every 6 months and through integration site analysis at Months 6, 12, and as warranted.
Hematologic Malignancy
Hematologic malignancy has occurred in patients treated with LYFGENIA (Study 1, Group A). At the time of initial product approval, two patients treated with an earlier version of LYFGENIA using a different manufacturing process and transplant procedure (Study 1, Group A) developed acute myeloid leukemia (AML). One patient with α-thalassemia trait (Study 1, Group C) has been diagnosed with myelodysplastic syndrome (MDS).
The additional hematopoietic stress associated with mobilization, conditioning, and infusion of LYFGENIA, including the need to regenerate the hematopoietic system, may increase the risk of a hematologic malignancy. Patients with sickle cell disease have an increased risk of hematologic malignancy as compared to the general population.
Patients treated with LYFGENIA may develop hematologic malignancies and should have lifelong monitoring. Monitor for hematologic malignancies with a complete blood count (with differential) at least every 6 months for at least 15 years after treatment with LYFGENIA, and integration site analysis at Months 6, 12, and as warranted.
In the event that a malignancy occurs, contact bluebird bio at 1-833-999-6378 for reporting and to obtain instructions on collection of samples for testing.
Post-Marketing Long Term Follow-Up Study: Patients who intend to receive treatment with LYFGENIA are encouraged to enroll in the study, as available, to assess the long-term safety of LYFGENIA and the risk of malignancies occurring after treatment with LYFGENIA by calling bluebird bio at 1-833-999-6378. The study includes monitoring (at pre-specified intervals) for clonal expansion.
Delayed Platelet Engraftment
Delayed platelet engraftment has been observed with LYFGENIA. Bleeding risk is increased prior to platelet engraftment and may continue after engraftment in patients with prolonged thrombocytopenia. Two patients (4%) required more than 100 days post treatment with LYFGENIA to achieve platelet engraftment.
Patients should be made aware of the risk of bleeding until platelet recovery has been achieved. Monitor patients for thrombocytopenia and bleeding according to standard guidelines. Conduct frequent platelet counts until platelet engraftment and platelet recovery are achieved. Perform blood cell count determination and other appropriate testing whenever clinical symptoms suggestive of bleeding arise.
Neutrophil Engraftment Failure
There is a potential risk of neutrophil engraftment failure after treatment with LYFGENIA. Neutrophil engraftment failure is defined as failure to achieve three consecutive absolute neutrophil counts (ANC) ≥ 0.5 × 109 cells/L obtained on different days by Day 43 after infusion of LYFGENIA. Monitor neutrophil counts until engraftment has been achieved. If neutrophil engraftment failure occurs in a patient treated with LYFGENIA, provide rescue treatment with the back-up collection of CD34+ cells.
Insertional Oncogenesis
There is a potential risk of lentiviral vector-mediated insertional oncogenesis after treatment with LYFGENIA.
Hypersensitivity Reactions
Allergic reactions may occur with the infusion of LYFGENIA. The dimethyl sulfoxide (DMSO) or dextran 40 in LYFGENIA may cause hypersensitivity reactions, including anaphylaxis.
Anti-retroviral Use
Patients should not take prophylactic HIV anti-retroviral medications for at least one month prior to mobilization and until all cycles of apheresis are completed. There are some long-acting anti-retroviral medications that may require a longer duration of discontinuation for elimination of the medication. If a patient is taking anti-retrovirals for HIV prophylaxis, confirm a negative test for HIV before beginning mobilization and apheresis of CD34+ cells.
Hydroxyurea Use
Patients should not take hydroxyurea for at least 2 months prior to mobilization and until all cycles of apheresis are completed. If hydroxyurea is administered between mobilization and conditioning, discontinue 2 days prior to initiation of conditioning.
Iron Chelation
Drug-drug interactions between iron chelators and the mobilization process and myeloablative conditioning agent must be considered. Iron chelators should be discontinued at least 7 days prior to initiation of mobilization or conditioning. Do not administer myelosuppressive iron chelators (e.g., deferiprone) for 6 months post-treatment with LYFGENIA. Non-myelosuppressive iron chelation should be restarted no sooner than 3 months after LYFGENIA infusion. Phlebotomy can be used in lieu of iron chelation, when appropriate.
Interference with PCR-based Testing
Patients who have received LYFGENIA are likely to test positive by polymerase chain reaction (PCR) assays for HIV due to integrated BB305 LVV proviral DNA, resulting in a possible false-positive PCR assay test result for HIV. Therefore, patients who have received LYFGENIA should not be screened for HIV infection using a PCR-based assay.
Adverse Reactions
The most common adverse reactions ≥ Grade 3 (incidence ≥ 20%) were stomatitis, thrombocytopenia, neutropenia, febrile neutropenia, anemia, and leukopenia.
Three patients died during LYFGENIA clinical trials; one from sudden cardiac death due to underlying disease and two from acute myeloid leukemia who were treated with an earlier version of LYFGENIA using a different manufacturing process and transplant procedure (Study 1, Group A).
Pregnancy/Lactation
Advise patients of the risks associated with myeloablative conditioning agents, including on pregnancy and fertility.
LYFGENIA should not be administered to women who are pregnant, and pregnancy after LYFGENIA infusion should be discussed with the treating physician.
LYFGENIA is not recommended for women who are breastfeeding, and breastfeeding after LYFGENIA infusion should be discussed with the treating physician.
Females and Males of Reproductive Potential
A negative serum pregnancy test must be confirmed prior to the start of mobilization and re-confirmed prior to conditioning procedures and before LYFGENIA administration.
Women of childbearing potential and men capable of fathering a child should use an effective method of contraception (intra-uterine device or combination of hormonal and barrier contraception) from start of mobilization through at least 6 months after administration of LYFGENIA.
Advise patients of the options for fertility preservation.
Please see full Prescribing Information for LYFGENIA including Boxed WARNING and Medication Guide.
About ZYNTEGLO (betibeglogene autotemcel) or beti-cel
ZYNTEGLO is a first-in-class, one-time ex-vivo LVV gene therapy approved for the treatment of beta-thalassemia in adult and pediatric patients who require regular red blood cell transfusions. ZYNTEGLO works by adding functional copies of a modified form of the beta-globin gene (βA-T87Q-globin gene) into a patient’s own hematopoietic (blood) stem cells to enable the production of a modified functional adult hemoglobin (HbAT87Q). Once a patient has the βA-T87Q-globin gene, they have the potential to increase ZYNTEGLO-derived adult hemoglobin (HbAT87Q) and total hemoglobin to normal or near normal levels that can eliminate the need for regular red blood cell (RBC) transfusions.
Indication
ZYNTEGLO is indicated for the treatment of adult and pediatric patients with beta-thalassemia who require regular red blood cell (RBC) transfusions.
Important Safety Information
Delayed Platelet Engraftment
Delayed platelet engraftment has been observed with ZYNTEGLO treatment. Bleeding risk is increased prior to platelet engraftment and may continue after engraftment in patients with prolonged thrombocytopenia; 15% of patients had ≥ Grade 3 decreased platelets on or after Day 100.
Patients should be made aware of the risk of bleeding until platelet recovery has been achieved. Monitor patients for thrombocytopenia and bleeding according to standard guidelines. Conduct frequent platelet counts until platelet engraftment and platelet recovery are achieved. Perform blood cell count determination and other appropriate testing whenever clinical symptoms suggestive of bleeding arise.
Risk of Neutrophil Engraftment Failure
There is a potential risk of neutrophil engraftment failure after treatment with ZYNTEGLO. Neutrophil engraftment failure is defined as failure to achieve three consecutive absolute neutrophil counts (ANC) ≥ 500 cells/microliter obtained on different days by Day 43 after infusion of ZYNTEGLO. Monitor neutrophil counts until engraftment has been achieved. If neutrophil engraftment failure occurs in a patient treated with ZYNTEGLO, provide rescue treatment with the back-up collection of CD34+ cells.
Risk of Insertional Oncogenesis
There is a potential risk of LVV mediated insertional oncogenesis after treatment with ZYNTEGLO.
Patients treated with ZYNTEGLO may develop hematologic malignancies and should be monitored lifelong. Monitor for hematologic malignancies with a complete blood count (with differential) at Month 6 and Month 12 and then at least annually for at least 15 years after treatment with ZYNTEGLO, and integration site analysis at Months 6, 12, and as warranted.
In the event that a malignancy occurs, contact bluebird bio at 1 833-999-6378 for reporting and to obtain instructions on collection of samples for testing.
Hypersensitivity Reactions
Allergic reactions may occur with the infusion of ZYNTEGLO. The dimethyl sulfoxide (DMSO) in ZYNTEGLO may cause hypersensitivity reactions, including anaphylaxis.
Anti-retroviral and Hydroxyurea Use
Patients should not take prophylactic HIV anti-retroviral medications or hydroxyurea for at least one month prior to mobilization, or for the expected duration for elimination of the medications, and until all cycles of apheresis are completed. If a patient requires anti-retrovirals for HIV prophylaxis, then confirm a negative test for HIV before beginning mobilization and apheresis of CD34+ cells.
Interference with Serology Testing
Patients who have received ZYNTEGLO are likely to test positive by polymerase chain reaction (PCR) assays for HIV due to integrated BB305 LVV proviral DNA, resulting in a false-positive test for HIV. Therefore, patients who have received ZYNTEGLO should not be screened for HIV infection using a PCR-based assay.
Adverse Reactions
The most common non-laboratory adverse reactions (≥20%) were mucositis, febrile neutropenia, vomiting, pyrexia, alopecia, epistaxis, abdominal pain, musculoskeletal pain, cough, headache, diarrhea, rash, constipation, nausea, decreased appetite, pigmentation disorder, and pruritus. The most common Grade 3 or 4 laboratory abnormalities (>50%) include neutropenia, thrombocytopenia, leukopenia, anemia, and lymphopenia.
Drug Interactions
Drug-drug interactions between iron chelators and the myeloablative conditioning agent must be considered. Iron chelators should be discontinued at least 7 days prior to initiation of conditioning. The prescribing information for the iron chelator(s) and the myeloablative conditioning agent should be consulted for the recommendations regarding co-administration with CYP3A substrates.
Some iron chelators are myelosuppressive. After ZYNTEGLO infusion, avoid use of these iron chelators for 6 months. If iron chelation is needed, consider administration of non-myelosuppressive iron chelators. Phlebotomy can be used in lieu of iron chelation, when appropriate.
Pregnancy/Lactation
Advise patients of the risks associated with conditioning agents, including on pregnancy and fertility.
ZYNTEGLO should not be administered to women who are pregnant, and pregnancy after ZYNTEGLO infusion should be discussed with the treating physician.
ZYNTEGLO is not recommended for women who are breastfeeding, and breastfeeding after ZYNTEGLO infusion should be discussed with the treating physician.
Females and Males of Reproductive Potential
A negative serum pregnancy test must be confirmed prior to the start of mobilization and re-confirmed prior to conditioning procedures and before ZYNTEGLO administration.
Women of childbearing potential and men capable of fathering a child should use an effective method of contraception (intra uterine device or combination of hormonal and barrier contraception) from start of mobilization through at least 6 months after administration of ZYNTEGLO.
Advise patients of the option to cryopreserve semen or ova before treatment if appropriate.
Please see full Prescribing Information for ZYNTEGLO.