    <SEC-DOCUMENT>0001104659-20-049860-index.html : 20200423
    <SEC-HEADER>0001104659-20-049860.hdr.sgml : 20200423
    <ACCEPTANCE-DATETIME>20200422210143
    ACCESSION NUMBER:		0001104659-20-049860
    CONFORMED SUBMISSION TYPE:	DEF 14A
    PUBLIC DOCUMENT COUNT:		11
    CONFORMED PERIOD OF REPORT:	20200609
    FILED AS OF DATE:		20200423
    DATE AS OF CHANGE:		20200422
    EFFECTIVENESS DATE:		20200423

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			SELLAS Life Sciences Group, Inc.
    		CENTRAL INDEX KEY:			0001390478
    		STANDARD INDUSTRIAL CLASSIFICATION:	PHARMACEUTICAL PREPARATIONS [2834]
    		IRS NUMBER:				000000000
    		STATE OF INCORPORATION:			DE
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		DEF 14A
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	001-33958
    		FILM NUMBER:		20808998

    	BUSINESS ADDRESS:
    		STREET 1:		15 WEST 38TH STREET
    		STREET 2:		10TH FLOOR
    		CITY:			NEW YORK
    		STATE:			NY
    		ZIP:			10018
    		BUSINESS PHONE:		(917) 438-4353

    	MAIL ADDRESS:
    		STREET 1:		15 WEST 38TH STREET
    		STREET 2:		10TH FLOOR
    		CITY:			NEW YORK
    		STATE:			NY
    		ZIP:			10018

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	Galena Biopharma, Inc.
    		DATE OF NAME CHANGE:	20110926

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	RXi Pharmaceuticals Corp
    		DATE OF NAME CHANGE:	20110926

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	GALENA BIOPHARMA, INC.
    		DATE OF NAME CHANGE:	20110922
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>DEF 14A
    <SEQUENCE>1
    <FILENAME>tm2016499d1_def14a.htm
    <DESCRIPTION>DEF 14A
    <TEXT>
    Document 1 - file: tm2016499d1_def14a.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>2
    <FILENAME>tm2016499d1_def14a-img01.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 2 - file: tm2016499d1_def14a-img01.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>3
    <FILENAME>tm2016499d1_def14a-img02.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 3 - file: tm2016499d1_def14a-img02.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>4
    <FILENAME>tm2016499d1_def14a-img03.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 4 - file: tm2016499d1_def14a-img03.jpg

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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>5
    <FILENAME>tm2016499d1_def14a-img04.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 5 - file: tm2016499d1_def14a-img04.jpg

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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>6
    <FILENAME>tm2016499d1_def14a-img05.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 6 - file: tm2016499d1_def14a-img05.jpg

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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>7
    <FILENAME>tm2016499d1_def14a-img06.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 7 - file: tm2016499d1_def14a-img06.jpg

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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>8
    <FILENAME>tm2016499d1_def14a-img07.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 8 - file: tm2016499d1_def14a-img07.jpg

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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>9
    <FILENAME>tm2016499d1_def14a-img08.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 9 - file: tm2016499d1_def14a-img08.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>10
    <FILENAME>tm2016499d1_def14a-img09.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 10 - file: tm2016499d1_def14a-img09.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>11
    <FILENAME>tm2016499d1_def14a-img10.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 11 - file: tm2016499d1_def14a-img10.jpg

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    </SEC-DOCUMENT>