“…Because the first genuinely promising drug, azathioprine (8), proved to be effective only rarely when given alone (69), the "modern" era was not entered until it was realized that azathioprine and prednisone have an additive (or possibly synergistic) effect (67, [70][71][72][73]. At the outset, our policy was to begin therapy after renal transplantation with azathioprine and to add high doses of prednisone with the first signs of rejection (70).…”