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We hereby consent to the incorporation by reference in the Registration Statements on Form S-8 (Nos. 333-240236, 333-232397, 333-226370, 333-212688, 333-204331, 333-197992, 333-188446, 333-176144, 333-168672, 333-148188, 333-56670) and Form S-3 (No. 333-251799) of Seagen Inc. of our report dated February 15, 2023 relating to the financial statements and the effectiveness of internal control over financial reporting, which appears in this Form 10-K.