- 30 Patients Relapsed or Refractory to Venetoclax-Based Regimens Enrolled Ahead of Schedule - - Overall Response Rate (ORR) of 33% and 50% Achieved to Date in 60 mg QW and 30 mg BIW Cohorts, Respectively - - 45 mg (Safety Dose) Once a Week of SLS009 Showed a Median Overall Survival (OS) of 5.4 Months vs. 2.5 Months with Standard of Care; 60 mg Once a Week and 30 mg Twice a Week Median OS Have Not Been Reached Yet - - 100% Overall Response Rate in Patients with ASXL1 Mutation in the 30 mg BIW Cohort to Dat ...

- 30 Patients Relapsed or Refractory to Venetoclax-Based Regimens Enrolled Ahead of Schedule - - Overall Response Rate (ORR) of 33% and 50% Achieved to Date in 60 mg QW and 30 mg BIW Cohorts, Respectively - - 45 mg (Safety Dose) Once a Week of SLS009 Showed a Median Overall Survival (OS) of 5.4 Months vs. 2.5 Months with Standard of Care; 60 mg Once a Week and 30 mg Twice a Week Median OS Have Not Been Reached Yet - - 100% Overall Response Rate in Patients with ASXL1 Mutation in the 30 mg BIW Cohort to Dat ...

Investors might want to bet on Galena Biopharma, Inc. (SLS) , as it has been recently upgraded to a Zacks Rank #2 (Buy). An upward trend in earnings estimates -- one of the most powerful forces impacting stock prices -- has triggered this rating change.The Zacks rating relies solely on a company's changing earnings picture. It tracks EPS estimates for the current and following years from the sell-side analysts covering the stock through a consensus measure -- the Zacks Consensus Estimate.The power of a chan ...

Exhibit 99.1 SELLAS Life Sciences Reports First Quarter 2024 Financial Results and Provides Corporate Update - Announced Independent Data Monitoring Committee’s (IDMC) Recommendation to Continue the Phase 3 REGAL Study in Patients with Acute Myeloid Leukemia (AML) Without Modifications: IDMC to Reconvene in June - - Completed Enrollment in Phase 3 REGAL Study of Galinpepimut-S - - Announced Positive Phase 2 Data of SLS009 Demonstrating 100% Response Rate in r/r AML Patients with ASXL1 Mutation at 30 mg BIW ...

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 ________________________________ FORM 10-Q ________________________________ ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2024 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission File Number: 001-33958 SELLAS Life Sciences Group, Inc. (Exact name of registrant as specified in its charter) Delaware 20- ...

Exhibit 99.1 SELLAS Life Sciences Reports Full Year 2023 Financial Results and Provides Corporate Update – Announced Phase 2a study of SLS009 in r/r AML Showing 50% Response Rate in the Selected Optimal Dose of 30 mg BIW Exceeding the Targeted 20% and 100% Response Rate in Patients with Identified Biomarkers - – Completed Enrollment in Phase 3 REGAL Study of Galinpepimut-S in Patients with Acute Myeloid Leukemia; Steering Committee Guided Interim Analysis May Be Imminent; IDMC Scheduled in Late April- – Pha ...

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 ________________________________ FORM 10-K ________________________________ (Mark One) ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2023 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from _________ to _________ Commission File Number: 001-33958 SELLAS Life Sciences G ...

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 ________________________________ FORM 10-Q ________________________________ ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2023 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission File Number: 001-33958 SELLAS Life Sciences Group, Inc. (Exact name of registrant as specified in its charter) Delaware ...

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 ________________________________ FORM 10-Q ________________________________ ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2023 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission File Number: 001-33958 SELLAS Life Sciences Group, Inc. (Exact name of registrant as specified in its charter) Delaware 20-8 ...

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 ________________________________ FORM 10-Q ________________________________ ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2023 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission File Number: 001-33958 SELLAS Life Sciences Group, Inc. (Exact name of registrant as specified in its charter) Delaware 20- ...