Exhibit 16.1

June 15, 2026

Securities and Exchange Commission

100 F Street, N.E.

Washington, DC 20549

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Commissioners:

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We have read Item 4.01 of Form 8-K dated June 12, 2026, of Coherus Oncology, Inc. and are in agreement with the statements contained in the first, second, third and fourth paragraphs on page 1 therein. We have no basis to agree or disagree with other statements of the registrant contained therein.

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/s/ Ernst & Young LLP

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