FILE PHOTO: James 'Jamie' Dimon, chairman, president and chief executive officer of JPMorgan Chase & Co., speaks during an Aspen Institute event in Washington, D.C., U.S., on Thursday, Dec. 12, 2013. Dimon, whose eight years atop JPMorgan Chase & Co. have made him one of Wall Streets most powerful leaders, said hell start treatment for throat cancer, raising new questions about succession plans at the biggest U.S bank. Photographer: Pete Marovich/Bloomberg via Getty Images ***  Local Caption *** James 'Jamie' Dimon,