Mustang Bio Reports Third Quarter 2020 Financial Results and Recent Corporate Highlights

WORCESTER, Mass., Nov. 06, 2020 (GLOBE NEWSWIRE) — Mustang Bio, Inc. (“Mustang”) (NASDAQ: MBIO), a clinical-stage biopharmaceutical company focused on translating today’s medical breakthroughs in cell and gene therapies into potential cures for hematologic cancers, solid tumors and rare genetic diseases, today announced financial results and recent corporate highlights for the third quarter ended September 30, 2020.

“Mustang had an eventful third quarter on the regulatory front, as the U.S. Food and Drug Administration (“FDA”) granted Rare Pediatric and Orphan Drug Designations to both of our gene therapy product candidates for the treatment of X-linked severe combined immunodeficiency (“XSCID”), MB-107, for newly diagnosed infants, and MB-207, for patients previously treated with hematopoietic stem cell transplantation (“HSCT”) and for whom re-treatment is indicated,” said Manuel Litchman, M.D., President and Chief Executive Officer of Mustang.

Dr. Litchman continued, “We are also pleased to report progress across our CAR T cell therapy programs during the third quarter and subsequent period. Most importantly, as recently reported, we have observed compelling efficacy without CAR T related toxicity in the first 4 non-Hodgkin lymphoma patients treated with MB-106, a CD20-targeted CAR T cell therapy, following a major revision in the cell manufacturing process at the Fred Hutch Cancer Research Center (“Fred Hutch”). We also dosed the first patient in a Phase 1/2 clinical trial of MB-102, a CD123-targeted CAR T cell therapy, under our own Investigational New Drug (“IND”) application for relapsed or refractory blastic plasmacytoid dendritic cell neoplasm, acute myeloid leukemia and high-risk myelodysplastic syndrome. Finally, we are encouraged by the significant response to MB-105, a prostate stem cell antigen (“PSCA”)-targeted CAR T therapy, reported by City of Hope in a 73-year-old patient with PSCA-positive metastatic castrate-resistant prostate cancer. This patient, who had failed eight prior therapies, experienced a 94 percent reduction in prostate-specific antigen, with a near complete reduction of measurable soft tissue metastasis by computerized tomography and improvement in bone metastases by magnetic resonance imaging. We look forward to achieving additional milestones in the coming months, as we expect to disclose additional promising clinical data from our MB-106 program at the American Society of Hematology (“ASH”) Annual Meeting next month. In addition, next quarter we expect to enroll the first patient on our pivotal MB-107 lentiviral gene therapy trial for newly diagnosed infants with XSCID and to file an IND for our pivotal MB-207 lentiviral gene therapy trial for previously transplanted patients with XSCID.”

Recent Corporate Highlights:

• In August 2020, Mustang announced that the FDA granted Rare Pediatric Disease Designation to MB-107, a lentiviral gene therapy for the treatment of XSCID, also known as bubble boy disease, in newly diagnosed infants and to MB-207, a lentiviral gene therapy for the treatment of patients with XSCID who have been previously treated with HSCT and for whom re-treatment is indicated.
• In September 2020, the FDA granted Orphan Drug Designation to MB-107 for the treatment of XSCID in newly diagnosed infants and to MB-207 for the treatment of patients with XSCID who have been previously treated with HSCT and for whom re-treatment is indicated.
• In October 2020, Mustang announced that the first patient had been dosed in a company-sponsored, open label, multicenter Phase 1/2 clinical trial to evaluate the safety and efficacy of MB-102 (CD123-targeted CAR T cell therapy) in patients with relapsed or refractory blastic plasmacytoid dendritic cell neoplasm (BPDCN), acute myeloid leukemia (AML) and high-risk myelodysplastic syndrome (hrMDS).
• In October 2020, Mustang licensed LentiBOOST™ technology from SIRION Biotech GmbH for the development of MB-207.
• In October 2020, City of Hope presented initial Phase 1 data on MB-105, a PSCA-targeted CAR T administered systemically to patients with PSCA-positive mCRPC, at the virtual 27^th Annual Prostate Cancer Foundation Scientific Retreat.
• Earlier this month, Mustang announced that interim Phase 1/2 data on MB-106, a CD20-targeted, autologous CAR T cell therapy for patients with relapsed or refractory B-cell non-Hodgkin lymphomas, were selected for a poster presentation at the 62^nd ASH Annual Meeting. A link to the abstract can be found here.

Financial Results:

• As of September 30, 2020, the company’s cash, cash equivalents and restricted cash totaled $76.3 million, compared to $86.4 million as of June 30, 2020, and $62.4 million as of December 31, 2019.
• Research and development expenses were $8.0 million for the third quarter of 2020. This compares to $7.3 million for the third quarter of 2019. Non-cash, stock-based compensation expenses included in research and development were $0.3 million for the third quarter of 2020, compared to $0.7 million for the third quarter of 2019.
• Research and development expenses from license acquisitions totaled $0.3 million for the third quarter of 2020, compared to $0.7 million for the third quarter of 2019.
• General and administrative expenses were $2.2 million for the third quarter of 2020. This compares to $2.0 million for the third quarter of 2019. Non-cash, stock-based compensation expenses included in general and administrative expenses were $0.3 million for the third quarter of 2020, compared to $0.4 million for the third quarter of 2019.
• Net loss attributable to common stockholders was $13.0 million, or $0.23 per share, for the third quarter of 2020, compared to a net loss attributable to common stockholders of $10.2 million, or $0.25 per share, for the third quarter of 2019.

About Mustang Bio
Mustang Bio, Inc. is a clinical-stage biopharmaceutical company focused on translating today’s medical breakthroughs in cell and gene therapies into potential cures for hematologic cancers, solid tumors and rare genetic diseases. Mustang aims to acquire rights to these technologies by licensing or otherwise acquiring an ownership interest, to fund research and development, and to outlicense or bring the technologies to market. Mustang has partnered with top medical institutions to advance the development of CAR T therapies across multiple cancers, as well as a lentiviral gene therapy for XSCID. Mustang is registered under the Securities Exchange Act of 1934, as amended, and files periodic reports with the U.S. Securities and Exchange Commission (“SEC”). Mustang was founded by Fortress Biotech, Inc. (NASDAQ: FBIO). For more information, visit www.mustangbio.com.

Forward‐Looking Statements
This press release may contain “forward-looking statements” within the meaning of Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934, each as amended. Such statements include, but are not limited to, any statements relating to our growth strategy and product development programs and any other statements that are not historical facts. Forward-looking statements are based on management’s current expectations and are subject to risks and uncertainties that could negatively affect our business, operating results, financial condition and stock value. Factors that could cause actual results to differ materially from those currently anticipated include: risks relating to our growth strategy; our ability to obtain, perform under, and maintain financing and strategic agreements and relationships; risks relating to the results of research and development activities; risks relating to the timing of starting and completing clinical trials; uncertainties relating to preclinical and clinical testing; our dependence on third-party suppliers; our ability to attract, integrate and retain key personnel; the early stage of products under development; our need for substantial additional funds; government regulation; patent and intellectual property matters; competition; as well as other risks described in our SEC filings. We expressly disclaim any obligation or undertaking to release publicly any updates or revisions to any forward-looking statements contained herein to reflect any change in our expectations or any changes in events, conditions or circumstances on which any such statement is based, except as required by law, and we claim the protection of the safe harbor for forward-looking statements contained in the Private Securities Litigation Reform Act of 1995.

Company Contacts:
Jaclyn Jaffe and William Begien
Mustang Bio, Inc.
(781) 652-4500
ir@mustangbio.com

Investor Relations Contact:
Daniel Ferry
LifeSci Advisors, LLC
(617) 430-7576
daniel@lifesciadvisors.com

Media Relations Contact:
Tony Plohoros
6 Degrees
(908) 591-2839
tplohoros@6degreespr.com