The investigators designed a single center, open-label, prospective study that routinely administered low-dose IL-2 therapy to monitor the improvement of clinical and laboratory parameters to explore its efficacy and to observe changes in immune cell subsets and cytokines.For all patients,rhIL-2(500,000 unit per square meter) infusions seven days;recurrent patients were applied again for 7 days;patients who were diagnosed HSPN were treated on a routine basis for 7 consecutive days, and then once every two week for 3months.
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