EXHIBIT 99.1

JOINT FILER AGREEMENT

In accordance with Rule 13d-1(k) under the Securities Exchange Act of 1934, as amended, the undersigned hereby agree that a single Schedule 13D, or any amendment thereto, relating to the equity securities of CASI Pharmaceuticals, Inc., a Delaware corporation, shall be filed on behalf of each of the undersigned and that this Agreement shall be filed as Exhibit 99.1 to such Schedule 13D.

Dated: May 14, 2018	SPECTRUM PHARMACEUTICALS, INC.,
		a Delaware corporation
		By:	/s/ Kurt A. Gustafson
		Name:	Kurt A. Gustafson
		Title:	Executive Vice President and Chief Financial Officer
Dated: May 14, 2018	SPECTRUM PHARMACEUTICALS CAYMAN, L.P.,
		an Exempted Limited Partnership organized under the laws of the Cayman Islands
		By:	Spectrum Pharmaceuticals International Holdings, LLC
		Its:	General Partner
			By:	Spectrum Pharmaceuticals, Inc.
			Its:	Managing Member
				By:	/s/ Kurt A. Gustafson
				Name:	Kurt A. Gustafson
				Title:	Executive Vice President and Chief Financial Officer