On March 6, 2024, Barbara A. Wood, Executive Vice President, General Counsel and Corporate Secretary of SELLAS Life Sciences Group, Inc. (the ?Company?), was terminated without cause, effective April 15, 2024. The Company expects to enter into a separation agreement and release of claims with Ms. Wood, the terms of which will be disclosed once available. In addition, on March 6, 2024, Robert Francomano, Senior Vice President and Chief Commercial Officer of the Company, was terminated without cause, effective March 31, 2024.

The Company expects to enter into a separation agreement and release of claims with Mr. Francomano, the terms of which will be disclosed once available. Stacy Yeung, recently promoted to Vice President, Associate General Counsel, and Head of Compliance, with 20 years of relevant experience will lead the Company?s legal and compliance functions.