1 Exhibit 23.1 CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS To Cell Pathways, Inc. and subsidiaries As independent public accountants, we hereby consent to the incorporation of our report included in this Form 10-K, into the Company's previously filed Form S-8 Registration Statement File No. 333-66701 and Form S-3 Registration Statement File No. 333-93811. Philadelphia, Pennsylvania March 27, 2000