Objective To study the efficacy of mycophemolatemofeil (MMF) on Henoch-Schonlein purpura nephritis(HSPN) and investigate the effects of MMF on the levels of renal type Ⅳ collagen,and to explore the best therapy and mechanism.Methods Taking 19 children with HSPN as objectives,and the children were randomly divided into MMF group(10 cases) and control group(9 cases).The MMF group was cured by prednisone with 1 mg/(kg·d )at first,then the dosage was reduced to 0.5 mg/(kg·d) after 3 months,and finally cured by ...