Eiger BioPharmaceuticals (EIGRQ) SC 13D/A Eiger BioPharmaceuticals, Inc.

Exhibit A

JOINT FILING STATEMENT

I, the undersigned, hereby express my agreement that the attached Schedule 13D (and any amendments thereto) relating to the Common Stock of Eiger BioPharmaceuticals, Inc. is filed on behalf of each of the undersigned.

Date: January 29, 2019

INTERWEST PARTNERS X, L.P.
By:	InterWest Management Partners X, LLC
Its:	General Partner
By:	/s/ Arnold L. Oronsky
	ARNOLD L. ORONSKY
	Managing Director
INTERWEST MANAGEMENT PARTNERS X, LLC
By:	/s/ Arnold L. Oronsky
	ARNOLD L. ORONSKY
	Managing Director
/s/ Gilbert H. Kliman
Gilbert H. Kliman
/s/ Arnold L. Oronsky
Arnold L. Oronsky
/s/ Khaled A. Nasr
Khaled A. Nasr
/s/ Karen A. Wilson
Karen A. Wilson,Attorney-in-Fact for Keval Desai