TG Therapeutics Confirms Registration Path for Umbralisib in Marginal Zone Lymphoma Following FDA Meeting

TG Therapeutics, Inc. announced that the Company has confirmed its path to submit umbralisib for accelerated approval based on data from the marginal zone lymphoma (MZL) cohort of the UNITY-NHL Phase 2b trial. The Company recently had a productive Breakthrough Therapy Designation (BTD) meeting with the U.S. Food and Drug Administration (FDA) to discuss the MZL submission strategy. Based on this meeting, the Company anticipates initiating a New Drug Application (NDA) submission for patients with previously treated MZL by year-end 2019.

Michael S. Weiss, Executive Chairman and Chief Executive Officer of TG Therapeutics stated, "Marginal zone lymphoma is an incurable disease for which there are limited available therapies. As a non-chemotherapy, orally active, once daily medication, we believe umbralisib could represent a meaningful new treatment option for patients with MZL. Defining a path to a regulatory submission for umbralisib for this patient population marks an important step forward for the Company and we appreciate the guidance we have received from the FDA. We look forward to beginning the NDA process later this year, as we work expeditiously to bring umbralisib to the patients who need it."  Mr. Weiss continued, "With our MZL NDA moving forward, and Phase 3 read-outs for CLL and MS targeted over approximately the next six to twelve months, we believe TG is well positioned for success."

ABOUT THE UNITY-NHL PHASE 2b STUDY—MARGINAL ZONE LYMPHOMA COHORT
The multicenter, open-label, UNITY-NHL Phase 2b study - Marginal Zone Lymphoma (MZL) cohort was designed to evaluate the safety and efficacy of single agent umbralisib, in patients with MZL who have received at least one prior anti-CD20 regimen. The primary endpoint is overall response rate (ORR) as determined by central Independent Review Committee (IRC) assessment.

The MZL cohort completed enrollment in August 2018 with a total of 69 patients enrolled and receiving at least one dose of umbralisib. In February of 2019, the Company announced that the MZL cohort met its primary endpoint of ORR as determined by central IRC for all treated patients (n=69). While the study has already met the Company’s target guidance of 40-50% ORR, the final analysis of ORR will be conducted when all treated patients have had at least 9 cycles (cycle = 28 days) of follow-up. Secondary endpoints include safety, duration of response, and progression-free survival (PFS).

ABOUT BREAKTHROUGH THERAPY DESIGNATION
The Company announced in January of 2019 that the U. S. Food and Drug Administration (FDA) granted Breakthrough Therapy Designation (BTD) for umbralisib for the treatment of adult patients with MZL who have received at least one prior anti-CD20 regimen.

The FDA’s Breakthrough Therapy Designation is intended to expedite the development and review of a drug candidate that is planned to treat a serious or life-threatening disease or condition and preliminary clinical evidence indicates that the drug may demonstrate substantial improvement on one or more clinically significant endpoints over available therapies.

ABOUT TG THERAPEUTICS, INC.
TG Therapeutics is a biopharmaceutical company focused on the acquisition, development and commercialization of novel treatments for B-cell malignancies and autoimmune diseases. Currently, the company is developing multiple therapies targeting hematological malignancies and autoimmune diseases. Ublituximab (TG-1101) is a novel, glycoengineered monoclonal antibody that targets a specific and unique epitope on the CD20 antigen found on mature B-lymphocytes. TG Therapeutics is also developing umbralisib (TGR-1202), an oral, once-daily inhibitor of PI3K-delta. Umbralisib uniquely inhibits CK1-epsilon, which may allow it to overcome certain tolerability issues associated with first generation PI3K-delta inhibitors. Both ublituximab and umbralisib, or the combination of which is referred to as "U2", are in Phase 3 clinical development for patients with hematologic malignancies, with ublituximab also in Phase 3 clinical development for Multiple Sclerosis. Additionally, the Company has recently brought into Phase 1 clinical development, TG-1501, its anti-PD-L1 monoclonal antibody, TG-1701, its covalently-bound Bruton’s Tyrosine Kinase (BTK) inhibitor and TG-1801, its anti-CD47/CD19 bispecific antibody. TG Therapeutics is headquartered in New York City.