Exhibit 23.1
Consent of Independent Registered Public Accounting Firm
We consent to the incorporation by reference in this Registration Statement on Form S-8 of SELLAS Life Sciences Group, Inc. (the “Company”), of our report dated March 16, 2023, relating to the consolidated financial statements of the Company (which report expresses an unqualified opinion and includes an explanatory paragraph relating to a going concern emphasis), appearing in the Annual Report on Form 10-K of the Company for the year ended December 31, 2022, filed with the Securities and Exchange Commission.
/s/ Moss Adams LLP
Campbell, California
January 19, 2024