SELLAS Life Sciences Group, Inc.

15 West 38^th St., 10^th Floor

New York, New York 10018

June 9, 2020

Via EDGAR

Sonia Bednarowski

United States Securities and Exchange Commission

Division of Corporate Finance

100 F Street, N.E.
Washington, D.C. 20549

Re:	SELLAS Life Sciences Group, Inc.
	Registration Statement on Form S-1
	File No.  333-238799
	Acceleration Request

Dear Ms. Bednarowski,

Pursuant to Rule 461 of Regulation C promulgated under the Securities Act of 1933, as amended, SELLAS Life Sciences Group, Inc. (the “Registrant”) hereby requests acceleration of the effective date of its Registration Statement on Form S-1 (File No. 333-238799), so that it may become effective at 4:00 p.m. (Washington, D.C. time) on Thursday, June 11, 2020, or as soon thereafter as practicable.

Please call Daniel A. Bagliebter, of Mintz, Levin, Cohn, Ferris, Glovsky and Popeo, P.C., counsel to the Registrant, at (212) 692-6856 with any comments or questions regarding the Registration Statement.

Very truly yours,

SELLAS Life Sciences Group, Inc.

/s/ Angelos M. Stergiou

By:  Angelos M. Stergiou, M.D., Sc.D., h.c.

Its:  President and Chief Executive Officer

cc:	Barbara A. Wood, SELLAS Life Sciences Group, Inc.
	Daniel A. Bagliebter, Esq., Mintz, Levin, Cohn, Ferris, Glovsky and Popeo, P.C.