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Form of Proxy

SELLAS LIFE SCIENCES GROUP, INC.

Notes

No. Proposition For Against Abstain
1

Election of Class III Director to serve on our Board for a three-year term expiring on the date of the 2028 annual meeting of stockholders: Angelos M. Stergiou

2

Election of Class III Director to serve on our Board for a three-year term expiring on the date of the 2028 annual meeting of stockholders: John Varian

3

The ratification of the appointment by our Audit Committee of Moss Adams LLP as our independent registered public accounting firm for the fiscal year ending December 31, 2025.

4

The approval of an amendment to the Companys 2021 Employee Stock Purchase Plan (ESPP) to increase the number of shares of Common Stock available for sale under the ESPP by 800,000.

5

The advisory approval of the compensation of our named executive officers.

6

The advisory recommendation of the frequency of future advisory votes on the compensation of our named executive officers.

7

The approval of any postponement or adjournment of the 2025 Annual Meeting, from time to time, if necessary, to solicit additional proxies if there are not sufficient votes at the time of the 2025 Annual Meeting to adopt the proposals set forth above or to establish a quorum.