Mustang Bio soars on its gene therapy data

NEJM reports ‘medical breakthrough’ in Mustang Bio cell and gene therapy

Mustang Bio (MBIO) announced that the New England Journal of Medicine has published data from St. Jude Children’s Research Hospital, the nation’s “leading hospital” for understanding, treating and curing childhood cancer and other life-threatening diseases.

Mustang Bio soars on its gene therapy data, Stockwinners

The data comes from a Phase 1/2 clinical trial of a lentiviral gene therapy for the treatment of newly diagnosed infants under two years old with XSCID, also referred to as SCID-X1 and commonly known as “bubble boy disease.”

Under a licensing agreement with St. Jude, Mustang will develop the lentiviral gene therapy for commercial use as MB-107.

The multi-center Phase 1/2 clinical trial is evaluating the safety and efficacy of a lentiviral vector to transfer a normal copy of the IL2RG gene to bone marrow stem cells in newly diagnosed infants under the age of two with XSCID, preceded by low exposure-targeted busulfan conditioning.

A total of 10 infants have received the therapy to date in this clinical trial. Among the data highlights, bone marrow harvest, busulfan conditioning and cell infusion were well tolerated.

In seven of the eight cases, normalization of naive T-cell and natural killer cell numbers occurred within three to four months after treatment, accompanied by vector marking in T, B, NK and myeloid cells and marrow progenitors.

All patients cleared previous infections and are growing normally. Seven of the eight infants treated have developed normal IgM levels to date.

Most patients were discharged from the hospital within one month.

Data Highlights:

  • Bone marrow harvest, busulfan conditioning and cell infusion were well tolerated.
  • In seven of the eight cases, normalization of CD3+, CD4+ and CD4+ naïve T-cell and natural killer (“NK”) cell numbers occurred within three to four months after treatment, accompanied by vector marking in T, B, NK and myeloid cells and marrow progenitors.
    • The eighth infant had insufficient T cells initially, but normalization of T cells occurred following an unconditioned boost of gene-corrected cells, and the patient is progressing favorably.
  • All patients cleared previous infections and are growing normally.
  • Seven of the eight infants treated have developed normal IgM levels to date.
    • Four of these seven infants have discontinued monthly infusions of intravenous immunoglobulin (IVIG) therapy to date.
    • Three of those four infants that discontinued monthly IVIG infusions have responded to vaccines to date.

MBIO closed at $2.66, it last traded at $8.91.

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