Exhibit 99.1

SELLAS Life Sciences Reports Corporate Highlights, Advancements for its Cancer Immunotherapy Pipeline and 2017 Financial Results

NEW YORK, NY, April 16, 2018 – SELLAS Life Sciences Group Inc. (Nasdaq: SLS) (“SELLAS”), a clinical-stage biopharmaceutical company focused on novel cancer immunotherapies for a broad range of cancer indications, today reported financial results for the year ended December 31, 2017 and provided a business update.

“In recent months, we have made meaningful progress advancing our business objectives, maturing SELLAS Life Sciences Group Ltd. into a publicly-traded company following the business combination and progressing our pipeline of cancer immunotherapies for patients with limited treatment options,” said Angelos Stergiou, MD, ScD h.c., President & Chief Executive Officer of SELLAS. “We are particularly excited about our recent financing and the positive interim results from the Phase 2b NeuVax™ + Herceptin study announced earlier this month which we believe help position SELLAS for continued success throughout the remainder of 2018. We also look forward to commencing the Phase 1/2 clinical trial of galinpepimut-S in combination with Keytruda® under our collaboration and supply agreement with Merck and our planned Phase 3 Acute Myeloid Leukemia program.”

Recent Corporate and Pipeline Highlights

 

    In April 2018, SELLAS announced positive interim data from the prospective, randomized, single-blinded, controlled Phase 2b independent investigator-sponsored clinical trial (IST) of trastuzumab (Herceptin®) +/-nelipepimut-S (NeuVax™) in HER 1+/2+ breast cancer patients in the adjuvant setting to prevent recurrences.

 

    In March 2018, open label Phase 2 clinical and immunological data for SELLAS’ lead product candidate, galinpepimut-S (GPS) in patients with multiple myeloma (MM) was presented at the 2018 European Society for Blood and Marrow Transplantation (EBMT) 44th Annual Meeting in Lisbon, Portugal. Median progression-free survival (PFS) of 23.6 months was reported in the high-risk disease setting, compared to historically inferior outcomes while on an immunomodulatory drug (IMID) or proteasome inhibitor post-autologous stem cell transplant maintenance.

 

    In March 2018, SELLAS appointed Barbara Wood as Executive Vice President, General Counsel and Corporate Secretary.

 

    In March 2018, SELLAS entered into a definitive securities purchase agreement to issue up to 10,700 shares of its Series A convertible preferred stock and warrants to purchase 1,363,631 shares of its common stock in a private placement transaction to a select group of institutional investors, in Europe and the United States, for aggregate gross proceeds of $10.7 million. The closing of the first tranche for approximately $6.0 million took place on March 9, 2018. The closing of the second tranche for approximately $4.7 million is expected to occur by the end of April 2018 following stockholder approval.

 

    In December 2017, SELLAS Life Sciences Group Ltd. (“SELLAS Ltd.”), a privately-held Bermuda exempted company, completed a business combination (the “Merger”) with Galena Biopharma, Inc. (“Galena”). Upon completion of the Merger, Galena was renamed “SELLAS Life Sciences Group, Inc.,” began trading under a new ticker symbol “SLS” and the combined company now includes the late-stage pipelines of novel cancer immunotherapies for both hematologic and solid malignancies of SELLAS Ltd. and Galena.

 

    In October 2017, SELLAS Ltd. entered into a clinical trial collaboration and supply agreement with Merck & Co. for a combination clinical trial targeting multiple cancer types, in which GPS will be administered in combination with Merck’s anti-PD-1 therapy KEYTRUDA® (pembrolizumab) in a Phase 1/2 trial in five cancer indications, including both hematologic malignancies and solid tumors.


The following information was filed by Sellas Life Sciences Group, Inc. (SLS) on Monday, April 16, 2018 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-Q Quarterly Report statement of earnings and operation as management may choose to highlight particular information in the press release.

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