X0306 4 2019-03-14 0 0001390478 SELLAS Life Sciences Group, Inc. SLS 0001416176 Varian John C/O SELLAS LIFE SCIENCES GROUP, INC. 15 WEST 38TH STREET, 10TH FLOOR NEW YORK NY 10018 1 0 0 0 Stock Option (Right to Buy) 1.38 2019-03-14 4 A 0 25000 0.00 A 2029-03-14 Common Stock 25000 25000 D The shares subject to the option will fully vest on the earlier of (x) March 14, 2020 (the first anniversary of the date of grant) or (y) the day prior to the 2020 annual stockholders meeting, subject to the Reporting Person's continued service on the Issuer's Board of Directors through such date. Exhibit List: Exhibit 24 - Power of Attorney /s/ John Varian 2019-03-18