We had experienced 60 cases of chemonucleolysis with Discase(R)(chymopapain for injection) under careful patient selection of herniated lumbar discs and had followed up thereafter at least 3 months since July, 1984. Therapeutic results were generally favorable, with 90% of patients achieving either excellent or good(satisfactory) results. Three patients only had poor or failure results. There was no major anaphylatic reaction and no serious neurologic complications. Back spasm and stiffness/soreness were the most frequently encountered complications.