CANCELLATION OF UCT OPTION AGREEMENT The undersigned, NDA Cinical Trial Services, Inc. ("NDA") and shareholders representing a majority of the outstanding shares of capital stock of NDA, hereby agree, for good and valuable consideration, the receipt of which is hereby acknowledged, that the certain Option Agreement among NDA and its shareholders, Unilabs Cinical Trials, Ltd. and UniHolding Corp. dated September 27, 1995 is hereby cancelled, null and void as of the date hereof. Dated: August 26, 1996 NDA CLINICAL TRIAL SERVICES, INC. By: /s/ Ronald Gambardella Name: Ronald Gambardella POLY VENTURES II By: /s/ Robert Brill Name: Robert Brill LONG ISLAND VENTURE FUND By: /s/ Paul Lowell Name: Paul Lowell By: /s/ David Deutsch Name: David Deutsch By: /s/ Ronald Gamberdella Name: Ronald Gamberdella