GlobeNewswire Inc | Nov 12, 2021 08:45AM EST

November 12, 2021

NEW YORK, Nov. 12, 2021 (GLOBE NEWSWIRE) -- SELLAS Life Sciences Group, Inc. (NASDAQ: SLS) (SELLAS or the Company), a late-stage clinical biopharmaceutical company focused on developing novel cancer immunotherapies for a broad range of indications, today reported its financial results for the quarter ended September 30, 2021 and provided a business update.

During the third quarter of 2021, in addition to continuing to enroll patients in the United States and Europe for our Phase 3 REGAL study of galinpepimut-S (GPS) in acute myeloid leukemia (AML) patients, we also commenced clinical and regulatory preparations for a potential new Phase 2/3 study of GPS in AML patients following a bone marrow transplant (BMT) who harbor minimal residual disease (MRD), said Angelos M. Stergiou, MD, ScD. h.c., President and Chief Executive Officer of SELLAS. We are excited to begin exploring GPS as a treatment option for this post-BMT population which, based on the retrospective outcomes data published earlier in the summer, remains an area of unmet need. We believe there is significant opportunity for GPS to become the key antileukemic vaccine immunotherapy in various AML settings, with the potential to treat patients who have undergone a BMT as well as patients who have achieved second remission in AML (CR2), the indication of our REGAL study.

Dr. Yair Levy, Director of Hematologic Malignancies at the Baylor University Medical Center, stated I look forward to a clinical trial in transplanted patients that would address the high relapse rate among MRD positive (MRD+) AML patients. Although BMT remains the only truly curative treatment for AML patients with any significant disease risk, its benefit is limited by relapses in about 50% of patients who enter transplant with MRD. The trial being planned by SELLAS would explore whether GPS could be a treatment option for a much larger population of AML patients i.e., those patients who have undergone BMT whose chances of remaining in remission could significantly improve as well as the large number of MRD+ patients who have been shown to have a high relapse rate after BMT or who do not undergo a BMT because they are considered unlikely to benefit from it.

Pipeline Update and Corporate Highlights:

-- Phase 3 REGAL Study: Additional sites in the United States and European Union were activated during the third quarter with enrollment continuing. In addition, regulatory approval to commence the REGAL study was received in both Hungary and Taiwan during the quarter.The final statistical analysis plan (SAP) for the REGAL study provides for a planned interim safety and futility analysis after 80 events (deaths) which the Company had anticipated would take place in the first half of 2022, provided that the ongoing COVID-19 pandemic did not significantly adversely impact our projected timeline for enrollment. Over the last 12 to 18 months, the Company has monitored the impact of the COVID-19 pandemic on the projected timeline for the REGAL study. During this period, the Company took several steps to mitigate possible and actual delays due to the COVID-19 pandemic, including increasing the number of clinical sites and the number of countries in which sites are located in order to maintain the original timeline. Despite these mitigation steps, the Company now anticipates that the interim analysis will take place in the second half of 2022, provided that the ongoing COVID-19 pandemic does not continue to adversely impact the projected timeline for enrollment. In addition to the planned interim analysis under the SAP, the final charter for the Independent Data Monitoring Committee for the REGAL study provides for enrollment-based safety, futility, and efficacy analyses prior to the planned interim analysis. -- Planning for Potential Phase 2/3 GPS Study in AML Post-Transplant Patients: In August 2021, SELLAS hosted a Virtual Investor Symposium which focused on the potential for GPS in AML patients following a BMT. SELLAS management, Dr. Stergiou and Dr. Dragan Cicic, SVP, Clinical Development, were joined by leading cancer researcher Dr. Yair Levy, Director of Hematologic Malignancies at the Baylor University Medical Center. To access the event replay, click here. The Company is currently in the regulatory and clinical planning stages for a potential Phase 2/3 clinical trial of GPS in this patient population. -- Red Door Community Award: On November 11, 2021, Angelos M. Stergiou, MD, ScD. h.c., President and Chief Executive Officer of SELLAS, was honored on behalf of SELLAS by the Red Door Community (formerly Gildas Club) with the Red Door Award for Advances in Research.

Financial Results for the Third Quarter 2021:

Licensing revenue: There was no licensing revenue for the third quarter of 2021 and $7.6 million for the nine months ended September 30, 2021, which consists of the recognition of revenue from the Companys license agreement with 3D Medicines. The Company did not record any licensing revenue for the first nine months of 2020.

R&D Expenses: Research and development expenses for the third quarter of 2021 were $4.5 million, as compared to $2.4 million for the same period in 2020. Research and development expenses for the nine months ended September 30, 2021 were $12.3 million as compared to $6.5 million for the same period in 2020. The increase was primarily due to an increase in clinical trial expenses related to the Companys Phase 3 REGAL clinical trial of GPS in AML patients and a ramp up of the manufacture of clinical trial materials and registration batches of GPS, a technology transfer to a new contract manufacturer, clinical drug supply purchase costs in the European Union in preparation for opening sites and enrolling patients in EU countries, and personnel related expenses due to increased headcount.

G&A Expenses: General and administrative expenses for the third quarter of 2021 were $2.4 million, as compared to $2.1 million for the same period in 2020. General and administrative expenses for the nine months ended September 30, 2021 were $8.8 million, as compared to $6.3 million for the same period in 2020. The increase was primarily due to amortization expense associated with the capitalized contract acquisition costs of the 3D Medicines license agreement, an increase in legal fees as compared to the same period in 2020 during which the majority of legal expenses were offset by a reimbursement credit, and personnel related expenses due to increased headcount.

Net Loss: Net loss attributable to common stockholders was $7.1 million for the third quarter of 2021, or a basic and diluted loss per share attributable to common stockholders of $0.45, as compared to a net loss attributable to common stockholders of $4.5 million for the same period in 2020, or a basic and diluted loss per share attributable to common stockholders of $0.53. Net loss attributable to common stockholders was $14.1 million for the nine months ended September 30, 2021, or a basic and diluted loss per share attributable to common stockholders of $0.92, as compared to a net loss attributable to common stockholders of $13.1 million for the same period in 2020, or a basic and diluted loss per share attributable to common stockholders of $1.83.

Cash Position: As of September 30, 2021, cash and cash equivalents totaled approximately $26.3 million.

About SELLAS Life Sciences Group, Inc.SELLAS is a late-stage clinical biopharmaceutical company focused on developing novel cancer immunotherapeutics for a broad range of indications. SELLAS lead product candidate, GPS, is licensed from Memorial Sloan Kettering Cancer Center and targets the WT1 protein, which is present in an array of tumor types. GPS has potential both as a monotherapy and in combination to address a broad spectrum of hematologic malignancies and solid tumor indications. SELLAS second product candidate, nelipepimut-S (NPS), is a HER2-directed cancer immunotherapy with potential to treat patients with early-stage breast cancer with low to intermediate HER2 expression, otherwise known as HER2 1+ or 2+, which includes TNBC patients, following the standard of care.

For more information on SELLAS, please visit www.sellaslifesciences.com.

Forward-Looking Statements This press release contains forward-looking statements. All statements other than statements of historical facts are forward-looking statements, including those relating to future events. In some cases, forward-looking statements can be identified by terminology such as plan, expect, anticipate, may, might, will, should, project, believe, estimate, predict, potential, intend, or continue and other words or terms of similar meaning. These statements include, without limitation, statements related to the clinical development of GPS for AML, and the potential for GPS as a drug development candidate. These forward-looking statements are based on current plans, objectives, estimates, expectations, and intentions, and inherently involve significant risks and uncertainties. Actual results and the timing of events could differ materially from those anticipated in such forward-looking statements as a result of these risks and uncertainties, which include, without limitation, risks and uncertainties associated with the COVID-19 pandemic and its impact on the Companys clinical plans, risks and uncertainties associated with immune-oncology product development and clinical success thereof, the uncertainty of regulatory approval, and other risks and uncertainties affecting SELLAS and its development programs as set forth under the caption Risk Factors in SELLAS Annual Report on Form 10-K filed on March 23, 2021 and in its other SEC filings. Other risks and uncertainties of which SELLAS is not currently aware may also affect SELLAS forward-looking statements and may cause actual results and the timing of events to differ materially from those anticipated. The forward-looking statements herein are made only as of the date hereof. SELLAS undertakes no obligation to update or supplement any forward-looking statements to reflect actual results, new information, future events, changes in its expectations or other circumstances that exist after the date as of which the forward-looking statements were made.

Investor ContactAllison SossKCSA Strategic CommunicationsEmail: SELLAS@kcsa.comPhone: 212.896.1267

Media ContactRaquel Cona KCSA Strategic Communications Email: SELLAS@kcsa.comPhone: 212.896.1276

SELLAS LIFE SCIENCES GROUP, INC.CONSOLIDATED STATEMENTS OF OPERATIONS(Amounts in thousands, except share and per share data)(Unaudited)

Three Months Ended Nine Months Ended September 30, September 30, 2021 2020 2021 2020Licensing revenue $ ? $ ? $ 7,600 $ ? Operating expenses: Cost of licensing ? ? 200 ? revenueResearch and 4,541 2,367 12,281 6,511 developmentGeneral and 2,436 2,125 8,794 6,312 administrativeTotal operating 6,977 4,492 21,275 12,823 expensesOperating loss (6,977 ) (4,492 ) (13,675 ) (12,823 )Non-operating income (expense), net:Change in fair value of 30 6 (29 ) 25 warrant liabilityChange in fair value ofcontingent (140 ) 13 (403 ) (268 )considerationInterest income 2 ? 6 25 Total non-operating (108 ) 19 (426 ) (218 )income (expense), netNet loss (7,085 ) (4,473 ) (14,101 ) (13,041 )Deemed dividend arisingfrom warrant ? ? ? (78 )modificationsNet loss attributable $ (7,085 ) $ (4,473 ) $ (14,101 ) $ (13,119 )to common stockholders Per share information: Net loss per commonshare attributable to $ (0.45 ) $ (0.53 ) $ (0.92 ) $ (1.83 )common stockholders,basic and dilutedWeighted average commonshares outstanding, 15,874,076 8,418,038 15,344,210 7,174,859 basic and diluted

SELLAS LIFE SCIENCES GROUP, INC.CONSOLIDATED BALANCE SHEETS(Amounts in thousands, except share and per share data)(Unaudited)

September December 30, 31, 2021 2020 ASSETS Current assets: Cash and cash equivalents $ 26,281 $ 35,302 Restricted cash and cash equivalents 100 100 Contract asset ? 1,128 Prepaid expenses and other current assets 2,593 395 Total current assets 28,974 36,925 Operating lease right-of-use asset 767 896 In-process research and development 5,700 5,700 Goodwill 1,914 1,914 Deposits and other assets 597 614 Total assets $ 37,952 $ 46,049 LIABILITIES AND STOCKHOLDERS? EQUITY Current liabilities: Accounts payable $ 2,545 $ 4,657 Accrued expense and other current liabilities 2,584 1,913 Operating lease liability 190 166 Deferred revenue ? 5,600 Total current liabilities 5,319 12,336 Operating lease liability, non-current 667 825 Deferred tax liability 239 239 Warrant liability 84 55 Contingent consideration 5,036 4,633 Total liabilities 11,345 18,088 Commitments and contingencies Stockholders? equity: Preferred stock, $0.0001 par value; 5,000,000shares authorized; Series A convertible preferredstock, 17,500 shares designated; no shares issued ? ? and outstanding at September 30, 2021 and December31, 2020Common stock, $0.0001 par value; 350,000,000shares authorized, 15,874,131 and 14,254,554 2 1 shares issued and outstanding at September 30,2021 and December 31, 2020, respectivelyAdditional paid-in capital 158,610 145,864 Accumulated deficit (132,005 ) (117,904 )Total stockholders? equity 26,607 27,961 Total liabilities and stockholders? equity $ 37,952 $ 46,049