SELLAS Life Sciences Reports Full Year 2019 Financial Results and Provides Business Update

NEW YORK, March [13], 2020
-- SELLAS Life Sciences Group, Inc. (Nasdaq: SLS) (“SELLAS” or the “Company”), a late-stage clinical biopharmaceutical company focused on the development of novel cancer immunotherapies for a broad range of cancer indications, today reported financial results for the year ended December 31, 2019 and provided a business update.

“Our clinical and corporate progress in 2019 has laid the foundation for a busy and exciting 2020. We are progressing our clinical development program for galinpepimut-S (GPS), including our Phase 3 REGAL study in acute myeloid leukemia (AML), our Phase 1/2 basket study in combination with pembrolizumab (KEYTRUDA®), and our Phase 1 trial in combination with nivolumab (Opdivo®) in malignant pleural mesothelioma (MPM). The positive follow-up data of the Phase 2a AML CR2 study announced last month further support our Phase 3 REGAL study design,” said Angelos Stergiou, MD, ScD h.c., President and Chief Executive Officer of SELLAS. “Additionally, we have received and incorporated feedback from the U.S. Food and Drug Administration (FDA) on the design and plan for a Phase 3 registration-enabling study of nelipepimut-S (NPS) in patients with triple negative breast cancer (TNBC). Coupled with the Phase 2b data for NPS in combination with pembrolizumab in TNBC patients that were recently published in Clinical Cancer Research, this supports our business development efforts to pursue out-licensing opportunities for NPS’ clinical development.”

Recent Pipeline Highlights

Galinpepimut-S (GPS) Program

In February 2020, SELLAS announced positive follow-up data from its Phase 1/2 study of GPS in patients with AML in second complete remission (CR2). The final data show a median overall survival (OS) of 21.0 months, at a median follow-up of 30.8 months, in patients receiving GPS compared to 5.4 months in patients treated with best standard care (p-value < 0.02). GPS therapy continued to be well-tolerated throughout the study.
In February 2020, SELLAS announced the enrollment of the first patient in an investigator-sponsored clinical trial of GPS in combination with Bristol-Myers Squibb’s anti-PD-1 therapy, nivolumab (Opdivo®), in patients with MPM.
In January 2020, SELLAS announced that it has commenced patient screening for its pivotal Phase 3 REGAL study of GPS in patients with AML in CR2.

Nelipepimut-S (NPS) Program

Today, SELLAS is announcing that final results from the efficacy and safety data analysis of the Phase 2b independent investigator-sponsored clinical trial of the combination of trastuzumab (Herceptin®) +/- NPS targeting HER2 low-expressing breast cancer patient cohorts, including TNBC patients, were recently published in the peer reviewed journal, Clinical Cancer Research. With regard to the TNBC patient cohort, the data analysis shows:
Disease-free survival (DFS) landmark rate at 24 months for patients treated with NPS plus trastuzumab (n=53) was 92.6% compared to 70.2% for those treated with trastuzumab alone (n=44), a clinically and statistically significant improvement.
There was a statistically significant reduction of 71.9% (p=0.01) in the frequency of clinically detected recurrences in patients treated with the combination (NPS plus trastuzumab) versus trastuzumab alone.
The combination was generally well-tolerated and there were no clinicopathologic differences between the study groups.
In February 2020, SELLAS announced it finalized the design and plan for a Phase 3 registration-enabling study of NPS in combination with trastuzumab for the treatment of patients with TNBC in the adjuvant setting after standard treatment, following feedback from a Type C review with the FDA. SELLAS is actively pursuing out-licensing opportunities to fund and conduct the future clinical development of NPS.

The following information was filed by Sellas Life Sciences Group, Inc. (SLS) on Friday, March 13, 2020 as an 8K 2.02 statement, which is an earnings press release pertaining to results of operations and financial condition. It may be helpful to assess the quality of management by comparing the information in the press release to the information in the accompanying 10-K Annual Report statement of earnings and operation as management may choose to highlight particular information in the press release.

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