EX-16 2 ex16-1.txt EXHIBIT 16.1 EXHIBIT 16.1 August 3, 2004 Securities and Exchange Commission Mail Stop 11-3 450 5th Street, N.W. Washington, D.C. 20549 Dear Sirs/Madams: We have read Item 4 of Ligand Pharmaceuticals Incorporated's Form 8-K dated July 27, 2004, and we agree with the statements made in sentence 1 and 2 of the first paragraph and the statements in paragraphs 2, 3 and 4. We have no basis to agree or disagree with the 3rd sentence in paragraph 1. Yours truly, /s/ Deloitte & Touche LLP