X0306 4 2018-03-14 0 0001390478 SELLAS Life Sciences Group, Inc. SLS 0001220051 WOOD BARBARA A C/O SELLAS LIFE SCIENCES GROUP, INC. 315 MADISON AVENUE, 4TH FLOOR NEW YORK NY 10017 0 1 0 0 EVP, Gen. Counsel, Corp. Sec. Stock Option (Right to Buy) 5.10 2018-03-14 4 A 0 50000 0.00 A 2028-03-13 Common Stock 50000 50000 D One-quarter (1/4) of the option shares will vest and became exercisable one year from the March 14, 2018 grant date, and the remainder will vest and become exercisable in equal monthly installments for thirty-six (36) months thereafter, provided that the Reporting Person remains in service with the Issuer through each such monthly vesting date. Barbara A. Wood, by /s/ Ron A. Metzger, Attorney-in-Fact 2018-03-15