1 EXHIBIT 10.11C-2 February 25, 1997 GDK, Inc. c/o Caxton Corporation 667 Madison Ave, 10th Floor New York, NY 10021 Attn: Andy Waldman Gentlemen: In accordance with Section 13 of the Stock Purchase Warrant issued pursuant to the Securities Purchase Agreement dated May 11, 1994, we hereby notify you that the terms of your warrant have been adjusted such that rather than having the right to purchase 117,154 shares at $3.521, you now have the right to purchase 124,232 shares at $3.319 each. All other terms of the warrant agreement remain in effect. Please call me if you have any questions. Very Truly Yours, /s/ JOHN W. VARIAN - ------------------------------ John W. Varian Vice President, Finance & CFO JWV/cb