(Portland, OR) -- The CEO of OHSU's Knight Cancer Institute is stepping down. Dr. Bryan Drucker announced his resignation this week. In a letter to colleagues obtained by Willamette Week Druker said his goals to advance cancer research and approve patient care are no loner achievable at OHSU. Drucker's decision follows months of turmoil at the medical school and the hospital, which included the president's resignation in October. OHSU said Dr. Druker leaves an indelible legacy and they're grateful for his many years of leadership.