Tacrolimus (FK506), discovered in 1984 from Japanese soil fungus, revolutionized organ transplantation. Dr. Thomas Starzl’s pioneering work at the University of Pittsburgh demonstrated dramatic improvements over cyclosporine: liver graft survival increased from 65.5% to 86.2%, with rejection rates dropping to 1-2%. The Food and Drug Administration (FDA) approval followed for liver (1994), kidney (1997), and […]