Marker Therapeutics Reports Second Quarter 2019 Operating and Financial Results

Houston, TX—August 8, 2019—Marker Therapeutics, Inc. (Nasdaq:MRKR), a clinical-stage immuno-oncology company specializing in the development of next-generation T cell-based immunotherapies for the treatment of hematological malignancies and solid tumor indications, today provided a corporate update and reported financial results for the second quarter ended June 30, 2019. “We are encouraged by the data generated to date with our MultiTAA T cell therapies—particularly in pancreatic cancer—a disease that has not seen meaningful improvements in treatment outcomes in more than 40 years,” said Peter L. Hoang, President & CEO of Marker Therapeutics. “These data suggest that our therapy—which targets multiple antigens—continues to demonstrate epitope spreading, potentially contributing to the T cells’ ability to expand and produce a lasting anti-tumor effect, with no added toxicities. We will continue to follow these patients and enroll new patients to further evaluate durability.” Continued Mr. Hoang: “Encouraged by results from our investigator-sponsored trials, we are now looking forward to initiating our first Marker-sponsored trial with MultiTAA T cell therapies in patients with post-transplant acute myeloid leukemia, and look forward to continuing our discussions with the FDA regarding our Phase 2 trial.”

PROGRAM HIGHLIGHTS AND CURRENT UPDATES

Multi-Antigen Targeted (MultiTAA) T Cell Therapies Encouraging Interim Pancreatic Cancer Data Reported at AACR Meeting in July Marker recently reported interim data from an ongoing investigator-sponsored Phase 1/2 clinical trial led by Baylor College of Medicine (BCM), evaluating the Company’s MultiTAA T cell therapy in patients with pancreatic adenocarcinoma. Investigators plan to enroll a total of 45 patients with advanced or borderline resectable pancreatic cancer in the three-arm trial and a total of 19 patients had received infusions of MultiTAA T cell therapy as of July 5, 2019. The results from these patients—which were reviewed in an oral presentation during a plenary session at AACR’s Cell Therapy meeting in July—suggested that MultiTAA T cell therapy may contribute to more durable responses without added toxicity when used in combination with standard-of-care chemotherapy, or as a second-line therapy for patients who are chemo-refractory. Additionally, in patients with borderline surgically resectable disease—a challenging setting due to the associated dense fibrotic tissue—interim data suggest that MultiTAA T cells are capable of meaningfully infiltrating the tumor. Marker plans to follow these patients and enroll new patients to further evaluate durability. Marker Preparing for Company-Sponsored Phase 2 Clinical Trial in AML The multicenter trial will evaluate clinical efficacy of Marker’s MultiTAA T cell therapy in patients with AML in both the adjuvant and active disease setting following an allogeneic hematopoietic stem cell transplant (HSCT). The dose in the Phase 2 trial is expected to be the maximum tolerated dose currently determined in the BCM-sponsored Phase 1 trial. In the adjuvant setting, patients will be randomized to either MultiTAA T cell therapy at approximately 90 days post-transplant or standard of care observation, while the active disease patients will receive MultiTAA T cells upon relapse as part of a single-arm group. T Cell-Based Vaccines The Company continues to advance its T cell-based vaccine programs in ovarian cancer and triple negative breast cancer. Phase 2 Ovarian Cancer Clinical Trial Highlights
  • TPIV200 is being studied as a maintenance therapy for patients in their first remission after surgery and platinum-based chemotherapy.
  • Trial is fully enrolled, with a total of 120 patients randomized and treated at 17 clinical sites.
  • Company expects to reach planned interim analysis trigger of 55 patients who have progressed before the end of 2019 and to report results of this interim analysis in the fourth quarter of 2019.
Phase 2 Triple Negative Breast Cancer Trial Highlights
  • Based on preliminary analysis of 34 patients evaluated to date in the dose-finding, four-arm trial—including low and high-dose TPIV200 with or without cyclophosphamide—31 showed meaningful immune response to the vaccine treatment (subject to final review by independent biostatistical analysis).
  • Of 80 patients treated at 11 clinical sites, 14 have shown disease progression, as of June 30, 2019, following treatment with TPIV200.
CORPORATE UPDATE
  • On August 6, Steve Elms was appointed to Marker’s Board of Directors. Mr. Elms currently serves as Managing Partner at Aisling Capital.
SECOND QUARTER 2019 FINANCIAL RESULTS Net loss for the quarter ended June 30, 2019 was $5.6 million, compared to a net loss of $4.8 million for the quarter ended June 30, 2018. Research and development expenses were $3.2 million for the quarter ended June 30, 2019, an increase of $1.4 million, compared to $1.8 million for the quarter ended June 30, 2018. The increase was primarily attributable to increases in personnel-related expenses, including stock-based compensation expenses and consulting expenses, relating to the build-up of Marker’s internal infrastructure as the Company advances the clinical development of its MultiTAA T cell product candidates. General and administrative expenses were $2.7 million for the quarter ended June 30, 2019, a decrease of $0.4 million, compared to $3.1 million for the quarter ended June 30, 2018.  The decrease was primarily attributable to $1.2 million of merger-related expenses incurred during the three months ended June 30, 2018, offset by increased expenses relating to $0.3 million of headcount-related expenses, $0.4 million of non-merger-related legal and other professional expenses and $0.1 million of office-related and insurance expenses.  CASH POSITION AND GUIDANCE At June 30, 2019, Marker had cash and cash equivalents of $53.4 million. The Company believes that its existing cash and cash equivalents will fund the Company’s current operations into late 2020. About Marker Therapeutics, Inc.   Marker Therapeutics, Inc. is a clinical-stage immuno-oncology company specializing in the development of next-generation T cell-based immunotherapies for the treatment of hematological malignancies and solid tumor indications. Marker’s cell therapy technology is based on the selective expansion of non-engineered, tumor-specific T cells that recognize tumor associated antigens (i.e. tumor targets) and kill tumor cells expressing those targets. This population of T cells is designed to attack multiple tumor targets following infusion into patients and to activate the patient’s immune system to produce broad spectrum anti-tumor activity. Because Marker does not genetically engineer its T cell therapies, we believe that our product candidates will be easier and less expensive to manufacture, with reduced toxicities, compared to current engineered CAR-T and TCR-based approaches, and may provide patients with meaningful clinical benefit. As a result, Marker believes its portfolio of T cell therapies has a compelling product profile, as compared to current gene-modified CAR-T and TCR-based therapies. Marker is also advancing a number of innovative peptide and gene-based immuno-therapeutics for the treatment of metastatic solid tumors, including the Folate Receptor Alpha program (TPIV200) for breast and ovarian cancers and the HER2/neu program (TPIV100/110) for breast cancer, currently in Phase 2 clinical trials. To receive future press releases via email, please visit: https://www.markertherapeutics.com/email-alerts/   Forward-Looking Statement Disclaimer This release contains forward-looking statements for purposes of the safe harbor provisions of the Private Securities Litigation Reform Act of 1995. Statements in this news release concerning the Company’s expectations, plans, business outlook or future performance, and any other statements concerning assumptions made or expectations as to any future events, conditions, performance or other matters, are “forward-looking statements.” Forward-looking statements include statements regarding our intentions, beliefs, projections, outlook, analyses or current expectations concerning, among other things: our research, development and regulatory activities and expectations relating to our non-engineered multi-tumor antigen specific T cell therapies and our TPIV200 and TPIV100/110 programs; the effectiveness of these programs or the possible range of application and potential curative effects and safety in the treatment of diseases; and, the timing and success of our clinical trials, as well as clinical trials conducted by our collaborators. Forward-looking statements are by their nature subject to risks, uncertainties and other factors which could cause actual results to differ materially from those stated in such statements. Such risks, uncertainties and factors include, but are not limited to the risks set forth in the Company’s most recent Form 10-K, 10-Q and other SEC filings which are available through EDGAR at www.sec.gov. The Company assumes no obligation to update our forward-looking statements whether as a result of new information, future events or otherwise, after the date of this press release. Marker Therapeutics, Inc. Condensed Consolidated Balance Sheets (Unaudited) Marker Therapeutics, Inc. Condensed Consolidated Statements of Operations (Unaudited) Marker Therapeutics, Inc. Condensed Consolidated Statements of Cash Flows (Unaudited) Contacts Investor Solebury Trout Chiara Russo (617) 221-9197 crusso@soleburytrout.com   Media Solebury Trout Amy Bonanno (914) 450-0349 abonanno@soleburytrout.com