Sunday, October 27, 2024

US Approved Gene Therapies and Summary Basis for Approvals

The FDA presentation by Dr Gopa Raychaudhuri, "Facilitating Development of Gene Therapies for Rare Diseases," summarized all Gene Therapies approved by the US FDA. There were 19 approved gene therapies: 6 stem cell therapies, 6 T cell therapies, and 7 directly administered therapies.  



Gene therapy therapies are reviewed and approved by FDA Center for Biologicals Evaluation and Research (CBER), especially the Office of Therapeutic Products (OTP) - Approved Cellular and Gene Therapy Products are listed here

For each approved gene therapy, FDA publishes the product approval and review information on their website by year. The clinical evidence of effectiveness is provided to the public for transparency. For those 19 approved gene therapies, "Summary Basis for Regulatory Action" documents were reviewed and some basic information was summarized in the table below. 

Sponsor

Product & Indication

Study Design

Sample Size

FDA approval date/Brand Drug Name

Pfizer

Adeno-associated virus vector-based gene therapy.

 

Adults with moderate to severe hemophilia B.

Phase 1/2a Study C0371005 (Safety)  - open-label, single-dose, single-arm, multi-center.

 

Phase 3 Study C0371002 (Efficacy and Safety), open label, single-dose, multi-national study .

 

https://www.fda.gov/vaccines-blood-biologics/cellular-gene-therapy-products/beqvez

 

15 subjects

 

 

45 subjects

April 2024

Beqvez

 

Orchard Therapeutics

Stem cell-based gene therapy.

 

Children with pre-symptomatic late infantile, pre-symptomatic early juvenile, or early symptomatic early juvenile, metachromatic leukodystrophy.

Data from an adequate and well-controlled investigation comprised of two single arm, single-center, open-label studies, a European Union Expanded Access Program (EAP), and one ongoing long-term follow-up study and a natural history study.

https://www.fda.gov/vaccines-blood-biologics/cellular-gene-therapy-products/lenmeldy

 

Study OTL-200-201222 (n=18) and Study 205756 (n=10)

March 2024

Lenmeldy

Vertex

Stem cell-based gene therapy-genome editing using CRISPR/Cas9 and SPY101.

Patients aged 12 years and older with transfusion-dependent β-thalassemia (TDT).

Multinational, single-arm, open-label, phase 1/2/3 study.

https://www.fda.gov/vaccines-blood-biologics/casgevy


52 dosed,

35 evaluable.

Jan 2024

Casgevy

Vertex

Stem cell-based gene therapy -genome editing using CRISPR/Cas9/SPY101 technology.

Sickle cell disease in patients aged 12 years or older with recurrent vaso-occlusive crises.

Multinational, single-arm, phase 1/2/3 study.

 

 

https://www.fda.gov/vaccines-blood-biologics/casgevy

44 treated,

31 evaluable.

Dec 2023

Casgevy

Bluebird Bio

LVV gene therapy.

Sickle cell disease in patients aged12 years or older with a history of vaso-occlusive events.

Study Hgb 206, an ongoing Phase 1/2, open label, multicenter.

https://www.fda.gov/vaccines-blood-biologics/lyfgenia

 

Safety: 54 subjects.

 

Efficacy: 32 subjects.

Dec 2023

Lyfgenia

BioMarin 

Adeno-associated virus vector-based gene therapy.

 

Adults with severe hemophilia A.

Open-label, single-dose, single-arm, multinational phase 3 study.

 

https://www.fda.gov/vaccines-blood-biologics/roctavian

112 subjects dosed and constituted the rollover population evaluated.

June 2023

Roctavian

Sarepta

Adeno-associated virus vector-based gene therapy.

Ambulatory pediatric patients aged 4 through 5 years with Duchenne muscular dystrophy (DMD) with a confirmed mutation in the DMD gene.

Open-label study 101.

Randomized, double-blind, placebo-controlled study 102.

Open label study 103.

 https://www.fda.gov/vaccines-blood-biologics/tissue-tissue-products/elevidys

Safety: 85 subjects.

73 subjects received intended dose and 12 received lower doses.

 

 

June 2023

Elevidys

Krystal Biotech

Vector-based gene therapy.

 

Wounds in patients 6 months of age and older with dystrophic epidermolysis bullosa with mutation(s) in the collagen type VII alpha 1 chain (COL7A1) gene.

First-in-human, single-center, open-label, randomized, intra-subject, placebo (vehicle) controlled phase 1/2 study (KB103-001).

Multicenter, intra-subject randomized, placebo-controlled, double-blind open-label phase 3 study (B-VEC-03).

https://www.fda.gov/vaccines-blood-biologics/vyjuvek

 

9 subjects.

 

 

 

 

 

Safety: 31 subjects.

May 2023

Vyjuvek

Ferring Pharmaceuticals A/S

Vector-based gene therapy.

Adult patients with high-risk Bacillus Calmette-Guérin unresponsive non-muscle invasive bladder cancer with carcinoma in situ with or without papillary tumors.

Single-arm trial study (CS-003).

 

https://www.fda.gov/vaccines-blood-biologics/cellular-gene-therapy-products/adstiladrin

 

107 subjects enrolled.

98 subjects evaluable.

Efficacy: 55 subjects.

Dec 2022

Adstiladrin

CSL Behring

Adeno-associated virus vector-based gene therapy.

 

Adults with Hemophilia B (congenital Factor IX deficiency).

Open-label, single-dose, single-arm, multi-center phase 2b study.

Open-label, single-dose, multi-center, multinational phase 3 study.

https://www.fda.gov/vaccines-blood-biologics/vaccines/hemgenix

 

3 subjects.

 

 

54 subjects.

Nov 2022

Hemgenix

 

Bluebird bio

Stem cell-based gene therapy.

Slowing the progression of neurologic dysfunction in boys 4-17 years of age with early, active cerebral adrenoleukodystrophy.

 

Open-label, multicenter, single-arm phase 2/3 study.

Open-label, multicenter, single-arm phase 3 study.

 

https://www.fda.gov/vaccines-blood-biologics/skysona

 

Safety: 67 subjects.

Efficacy: 61 subjects.

Sept 2022

Skysona

Bluebird Bio

LVV Gene Therapy

Beta-thalassemia.

B cell maturation antigen-directed genetically modified.

Adult and pediatric patients with ß-thalassemia who require regular red blood cell (RBC) transfusions.

Two open-label, multicenter, single-arm phase 3 studies.

https://www.fda.gov/vaccines-blood-biologics/zynteglo

 

18 in HGB-212 study and 23 in HGB 207 study.

Aug 2022

Zynteglo

Janssen Biotech

Autologous T cell immunotherapy.

Adult patients with relapsed or refractory multiple myeloma who have received at least one prior line of therapy.

Single-arm, phase 1b-2 multicenter study.

 

https://www.fda.gov/vaccines-blood-biologics/cellular-gene-therapy-products/carvykti

 

Efficacy: 97 subjects.

Feb 2022

Carvykti

Celgene Corporation

B cell maturation antigen-directed genetically modified autologous T cell immunotherapy.

Adult patients with relapsed or refractory multiple myeloma after two or more prior lines of therapy including an immunomodulatory agent, a proteasome inhibitor, and an anti-CD38 monoclonal antibody

Single-arm, multicenter phase 2 study.

 

https://www.fda.gov/vaccines-blood-biologics/abecma-idecabtagene-vicleucel

 

Safety: 127 subjects.

Efficacy: 100 subjects.

March 2021

Abecma

Juno Therapeutics

CD19-directed genetically modified autologous T cell immunotherapy.

Adult patients with large B-cell lymphoma, including diffuse large B-cell lymphoma (DLBCL) not otherwise specified (including DLBCL arising from indolent lymphoma), high-grade B cell lymphoma, primary mediastinal large B-cell lymphoma, and follicular lymphoma grade 3B.

Single-arm, multicenter phase 1 study.

 

https://www.fda.gov/vaccines-blood-biologics/cellular-gene-therapy-products/breyanzi-lisocabtagene-maraleucel

 

Safety: 268 subjects.

Efficacy: 256 subjects.

Feb 2021

Breyanzi

Kite Pharma

CD19-directed genetically modified autologous T cell

Immunotherapy.

 

Adult patients with relapsed or refractory

Mantle Cell Lymphoma.

Single-arm, multicenter, phase 2 study.

 

https://public4.pagefreezer.com/browse/FDA/27-12-2021T03:59/https://www.fda.gov/vaccines-blood-biologics/cellular-gene-therapy-products/tecartus-brexucabtagene-autoleucel

 

68 subjects treated.

Efficacy: 60 subjects.

July 2020

Tecartus

AveXis

Adeno-associated virus vector-based gene therapy. 

Pediatric patients less than 2 years of age with spinal muscular atrophy (SMA) with bi-allelic mutations in the survival motor neuron 1 gene.

Open-label, single-arm, ascending-dose, phase 1 study.

Open-label, single-arm, phase 3 study.

https://public4.pagefreezer.com/browse/FDA/29-01-2023T09:49/https://www.fda.gov/vaccines-blood-biologics/zolgensma

 

15  subjects.

 

 

44 subjects.

May 2019

Zolgensma

Spark Therapeutics

Adeno-associated virus serotype 2 vector gene therapy.

 Confirmed biallelic RPE65 mutation-associated retinal dystrophy.

Open-label, dose-escalation, phase 1 study.

Open-label, randomized, controlled, cross-over, phase 3 study.

https://public4.pagefreezer.com/content/FDA/29-01-2023T09:49/https://www.fda.gov/vaccines-blood-biologics/cellular-gene-therapy-products/luxturna

 

12 subjects.

 

29 subjects.

Dec 2017

Luxturna

Kite Pharma

CD19-directed genetically modified autologous

T cell immunotherapy.

Adult patients with large B-cell lymphoma that is refractory to first-line chemoimmunotherapy or that relapses within 12 months of first-line chemoimmunotherapy

Single-arm, open-label, multicenter phase 1/2 study.

 

https://public4.pagefreezer.com/content/FDA/29-01-2023T09:49/https://www.fda.gov/vaccines-blood-biologics/cellular-gene-therapy-products/yescarta-axicabtagene-ciloleucel

 

Safety: 108 subjects.

Efficacy: 101 subjects.

Oct 2017

Yescarta

Novartis Pharmaceuticals

CD19-directed genetically modified autologous T cell immunotherapy.

Adult patients with relapsed or refractory follicular lymphoma after two or more lines of therapy.

Multicenter, open-label, single-arm, trial.

 

https://public4.pagefreezer.com/content/FDA/29-01-2023T09:49/https://www.fda.gov/vaccines-blood-biologics/cellular-gene-therapy-products/kymriah-tisagenlecleucel

 

63 subjects.

Aug 2017

Kymriah


The clinical evidence for the effectiveness of gene therapies often comes from multi-center, open-label, single-arm studies with relatively small sample sizes, as shown in the table above. In some cases, phases of clinical development are combined.

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