Exhibit A
JOINT FILING AGREEMENT
The undersigned agree that this Schedule 13G Amendment No. 1 dated May 12, 2026 relating to the Common Stock, $0.0001 par value per share, of Erasca, Inc. shall be filed on behalf of the undersigned.
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SUVRETTA CAPITAL MANAGEMENT, LLC
By: /s/ Andrew Nathanson | |
| Name: Andrew Nathanson | |
| Title: General Counsel and Chief Compliance Officer |
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AVERILL MASTER FUND, LTD.
By: /s/ Andrew Nathanson | |
| Name: Andrew Nathanson | |
| Title: Authorized Signatory |
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AARON COWEN
By: /s/ Aaron Cowen |