TG Therapeutics Completes Rolling Submission of Biologics License Application to the U.S. Food and Drug Administration for Ublituximab in Combination with Ukoniq (umbralisib) as a Treatment for Patients with Chronic Lymphocytic Leukemia

NEW YORK, March 29, 2021 (GLOBE NEWSWIRE) — TG Therapeutics, Inc. (NASDAQ: TGTX), today announced the completion of the rolling submission of a Biologics License Application (BLA) to the U.S. Food and Drug Administration (FDA) requesting approval of ublituximab, the Company’s investigational glycoengineered anti-CD20 monoclonal antibody, in combination with Ukoniq (umbralisib) , the Company’s once-daily, oral, inhibitor of PI3K-delta and CK1-epsilon, as a treatment for patients with chronic lymphocytic leukemia (CLL). The U.S. FDA previously granted Fast Track designation to the combination of ublituximab and umbralisib (U2) for the treatment of adult patients with CLL and orphan drug designation for ublituximab in combination with umbralisib for the treatment of CLL. The BLA submission was based on the results of the UNITY-CLL trial, a global Phase 3 trial evaluating the combination of umbralisib plus ublituximab (U2) compared to obinutuzumab plus chlorambucil in patients with previously untreated and relapsed/refractory chronic lymphocytic leukemia (CLL). 

Michael S. Weiss, Executive Chairman and Chief Executive Officer of TG Therapeutics stated, “The rapid completion of this BLA submission is a critical step forward in our mission to bring our first proprietary combination regimen to patients with both treatment naïve and relapsed or refractory chronic lymphocytic leukemia. The FDA has previously granted the U2 combination both fast track designation as well as orphan drug designation for patients with CLL and we look forward to continuing to work closely with the FDA with the goal of bringing this novel treatment regimen to patients as quickly as possible.” Mr. Weiss continued, “I want to thank the patients, their families and caregivers, as well as the research teams who participated in the UNITY-CLL trial, and also commend the TG team for their hard work to get this submission completed ahead of schedule.”

UNITY-CLL is a global Phase 3 randomized controlled clinical trial comparing the combination of ublituximab plus Ukoniq (umbralisib), or U2, to an active control arm of obinutuzumab plus chlorambucil in patients with both treatment-naïve and relapsed or refractory chronic lymphocytic leukemia (CLL). The trial randomized patients into four treatment arms: ublituximab single agent, Ukoniq single agent, ublituximab plus Ukoniq, and an active control arm of obinutuzumab plus chlorambucil. A prespecified interim analysis was conducted to assess the contribution of ublituximab and Ukoniq in the U2 combination arm and allowed for the termination of the single agent arms. Accordingly, the UNITY-CLL Phase 3 trial continued enrollment in a 1:1 ratio into the two combination arms: the investigational arm of U2 and the control arm of obinutuzumab plus chlorambucil. Approximately 420 subjects enrolled to the two combination arms and approximately 60% of patients were treatment-naïve and 40% were relapsed or refractory. The primary endpoint for this study was superior progression-free survival (PFS) for the U2 combination compared to the control arm to support the submission of the U2 combination in CLL. The trial met its primary endpoint and results were presented at the American Society of Hematology (ASH) Annual Meeting in December 2020. The UNITY-CLL Phase 3 trial is being conducted under a Special Protocol Assessment (SPA) agreement with the U.S. Food and Drug Administration (FDA).

Chronic lymphocytic leukemia (CLL) is the most common type of adult leukemia. It is estimated there will be more than 20,000 new cases of CLL diagnosed in the United States in 2020 and approximately 45,000 new cases globally in 2020.1,2 Although signs and symptoms of CLL may disappear for a period of time after initial treatment, the disease is considered incurable and many people will require additional treatment due to the return of malignant cells.

Fast Track is a program designed to expedite the development and review of drugs that treat serious conditions and that demonstrate the potential to address an unmet medical need. Filling an unmet medical need is defined as providing a therapy where none exists or providing a therapy that may be potentially better than available therapy.

A drug that receives Fast Track designation is eligible for more frequent interactions with the FDA, priority review if relevant criteria are met, and rolling submission of the Biologics License Application or New Drug Application.

Orphan drug designation is granted by the FDA to drugs and biologics which are defined as those intended for the safe and effective treatment, diagnosis or prevention of rare diseases/disorders that affect fewer than 200,000 people in the U.S. Orphan drug designation provides certain incentives which may include tax credits towards the cost of clinical trials and prescription drug user fee waivers. If a product that has orphan drug designation subsequently receives the first FDA approval for the disease for which it has such designation, the product is entitled to orphan product exclusivity.

TG Therapeutics is a fully-integrated, commercial stage biopharmaceutical company focused on the acquisition, development and commercialization of novel treatments for B-cell malignancies and autoimmune diseases. In addition to an active research pipeline including five investigational medicines across these therapeutic areas, Ukoniq (umbralisib) received accelerated approval from the U.S. FDA for the treatment of adult patients with relapsed/refractory marginal zone lymphoma who have received at least one prior anti-CD20-based regimen and relapsed/refractory follicular lymphoma who have received at least three prior lines of systemic therapies. Currently, the Company has programs in Phase 3 development for the treatment of patients with relapsing forms of multiple sclerosis (RMS) and for the treatment of patients with chronic lymphocytic leukemia (CLL) as well as several investigational medicines in Phase 1 clinical development. For more information, visit www.tgtherapeutics.com, and follow us on Twitter @TGTherapeutics and Linkedin.

Ukoniq is a trademark of TG Therapeutics, Inc.

Cautionary Statement
This press release contains forward-looking statements within the meaning of the U.S. Private Securities Litigation Reform Act of 1995, including statements relating to the BLA submission of ublituximab in combination with UKONIQTM (umbralisib), the clinical development of our product candidates, and anticipated milestones. In addition to the risk factors identified from time to time in our reports filed with the U.S. Securities and Exchange Commission, factors that could cause our actual results to differ materially are the following: risk that the FDA will not accept the BLA submission of ublituximab in combination with UKONIQ in patients with CLL, or if accepted, the risk that the FDA will not approve the BLA submission; the risk that fast track designation may not actually lead to a faster regulatory review or approval process; the risk that safety issues or trends will be observed in the UNITY-CLL study or in other studies that prevent approval of ublituximab in combination with UKONIQ; the risk that ublituximab in combination with UKONIQ, or any other product candidates, will not be commercially successful if approved; the risk that the differentiated tolerability profile for UKONIQ previously observed in clinical trials will not be reproduced in the UNITY-CLL trial or any other on-going studies; our ability to successfully and cost effectively complete preclinical and clinical trials; the uncertainties inherent in research and development; and the risk that the ongoing COVID-19 pandemic and associated government control measures have an adverse impact on our research and development plans or commercialization efforts. Further discussion about these and other risks and uncertainties can be found in our Annual Report on Form 10-K for the fiscal year ended December 31, 2020 and in our other filings with the U.S. Securities and Exchange Commission.

Any forward-looking statements set forth in this press release speak only as of the date of this press release. We do not undertake to update any of these forward-looking statements to reflect events or circumstances that occur after the date hereof. This press release and prior releases are available at www.tgtherapeutics.com. The information found on our website is not incorporated by reference into this press release and is included for reference purposes only.

Source: TG Therapeutics, Inc.

Posted: March 2021

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