UNITED STATES
                                        SECURITIES AND EXCHANGE COMMISSION
                                              Washington, D.C. 20549
                                              NOTICE OF EFFECTIVENESS


          Effective Date:     2024-05-01  
          Form:               S-3
          --------------------------------------------------------------------------------
          CIK:                     0001390478
          Company Name:            SELLAS Life Sciences Group, Inc.
          File Number:             333-278334