Exhibit 99.1
JOINT FILING AGREEMENT
In accordance with Rule 13d-1(k) under the Securities Exchange Act of 1934, as amended, the persons named below agree to the joint filing on behalf of each of them of a statement on Schedule 13G (including amendments thereto) with respect to the Common Stock, $0.001 par value, of Sierra Oncology, Inc., and further agree that this Joint Filing Agreement be included as an Exhibit to such joint filing.
| Vivo Capital IX, LLC | |
| November 25, 2019 | |
| (Date) | |
| /s/ Albert Cha | |
| (Signature) | |
| Managing Member | |
| (Title) | |
| Vivo Opportunity, LLC | |
| November 25, 2019 | |
| (Date) | |
| /s/ Albert Cha | |
| (Signature) | |
| Managing Member | |
| (Title) | |
| Vivo Ventures VII, LLC | |
| November 25, 2019 | |
| (Date) | |
| /s/ Albert Cha | |
| (Signature) | |
| Managing Member | |
| (Title) |