ImClone Systems Inc., the company shaken by insider trading charges that ensnared domestic diva Martha Stewart, announced Thursday that its chief executive has resigned. The CEO, Daniel S. Lynch, also resigned as a director, effectively immediately, by mutual agreement of the board, the company said. Dr. Philip Frost, the company’s executive vice president and chief scientific officer, will serve as an interim CEO as the board conducts an external search for permanent replacement. ImClone spokesman David Pitts wouldn’t discuss the reasons for the resignation.
