GT Biopharma announced that Shawn M. Cross will become chairman and chief executive officer effective February 15, 2018.   Mr. Cross has held the position of president and chief operating officer of GTBP since November 16, 2017. The plan to add the new positions to his current duties was initiated by the Company’s board of directors to prepare for the company’s next phase of growth.    Mr. Cross will lead GTBP through NASDAQ capital markets listing process, attract institut...