Exhibit 1

JOINT FILING AGREEMENT

The undersigned agree that this Schedule 13G Amendment No. 3 dated February 14, 2025 relating to the Common Stock, par value $0.001 per share of Kezar Life Sciences, Inc., shall be filed on behalf of the undersigned.

Avidity Partners Management LP

By Avidity Partners Management (GP) LLC, its general partner

By: /s/ Michael Gregory

Title: Managing Member

Avidity Partners Management (GP) LLC

By: /s/ Michael Gregory

Title: Managing Member

Avidity Capital Partners Fund (GP) LP

By Avidity Capital Partners (GP) LLC, its general partner

By: /s/ Michael Gregory

Title: Managing Member

Avidity Capital Partners (GP) LLC

By: /s/ Michael Gregory

Title: Managing Member

Avidity Master Fund LP

By Avidity Capital Partners Fund (GP) LP, its general partner

By: Avidity Capital Partners (GP) LLC, its general partner

By: /s/ Michael Gregory

Title: Managing Member

David Witzke

By: /s/ David Witzke

Michael Gregory

By: /s/ Michael Gregory