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This study was undertaken to evaluate the occurrence of VOD and other liver diseases following BMT in a patient population with a high incidence of hepatitis before conditioning regimen. We prospectively reviewed 186 consecutive patients undergoing BMT from 1976 to 1986 to determine incidence and type of liver disease after BMT and predisposing factors. Two of 186 patients experienced VOD (1.07%). Acute and chronic liver GVHD were found in 25.8% and 36% of the patients, respectively. Acute hepatitis (AH) was diagnosed in 29.4% and chronic hepatitis (CH) in 42.6% of the patients. Statistical analysis showed no influence of pretransplant variables on the occurrence of acute GVHD and AH; there was a weak correlation (P = 0.01) between pre-BMT abnormal transaminases and occurrence of chronic GVHD. Contingency table and Cox analysis showed a greater risk of CH for patients with abnormal pretransplant SGPT levels (P = 0.0004 and P = 0.0022). No other variables could be associated with posttransplant CH. Actuarial survival was 71% versus 69% for patients with normal versus abnormal transaminases (P = 0.2). As VOD was a rare event, despite 53% of patients having abnormal transaminase values before transplant, we suggest that a lower and slower TBI is more important than pretransplant normal transaminases in preventing this complication. We conclude that evidence of compensated hepatitis is not a relative contraindication for BMT.