The serum levels of some lysosomal enzymes-namely β-glucuronidase (EC 3.2.1.31), β-galactosidase (EC 3.2.1.23) and acid phosphatase (EC 3.1.3.2)-were measured in controls, pre-operative and post-operative nephroblastoma patients. β-glucuronidase activity showed a significant (p<0.05) increase before surgical intervention, followed by significant (p<0.05) decreases 24 h, 72 h and 7 days after…