13D Filing: Avego Healthcare Capital, LLC and Acer Therapeutics Inc. (ACER)

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Exhibit 1

JOINT FILING AGREEMENT

The undersigned hereby agree that the foregoing statement on
Schedule 13D is filed on behalf of each of the undersigned, and any amendments
thereto executed by the undersigned shall be filed on behalf of each of the
undersigned without the necessity of filing any additional joint filing
agreement. The undersigned acknowledge that each is responsible for the timely
filing of such statement on Schedule 13D and any amendments thereto, and for the
completeness and accuracy of the information concerning the others of the
undersigned, except to the extent that it knows or has reason to believe that
such information is inaccurate or incomplete. This Joint Filing Agreement may be
executed in any number of counterparts, all of which taken together shall
constitute one and the same instrument.

Date: September 28, 2017

AVEGO HEALTHCARE CAPITAL LLC
By: /s/ Bala
Venkataraman
Name: Bala Venkataraman
Its:
Manager

MAYURA TRUST B

By: MAYURA ONE, TRUSTEE
By: /s/ Bala
Venkataraman                                               
Name: Bala Venkataraman
Title:   Member
By: /s/ Yelena
Epova                                                        
Name: Yelena Epova
Title:   Member
By: /s/ Christopher R.
Manning                                      
Name: Christopher R. Manning
Title:   Member

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