Chongqing Paijin Biotechnology Co Ltd.

The main aim of this clinical trial is to assess the safety and tolerability of PN20 in adult patients with primary immune thrombocytopenia (ITP). The main questions it aims to answer are:
* Is PN20 safe in these patients?
* Could these patients potentially benefit from PN20 treatment?
Participants will
* Receive one subcutaneous injection of PN20 according to weight;
* Visit the clinic for assessment.

主要目的：评价PN20在成人原发免疫性血小板减少症患者中的安全性和耐受性并探索合适的给药剂量和治疗周期。 次要目的：①评价PN20在成人ITP患者中的药代动力学、药效动力学及免疫原性特征；② 评价PN20在成人ITP患者中的初步疗效。

在减少饮食热量摄入和增加体力活动基础上，评价采用试验药物司美格鲁肽注射液与对照药品原研司美格鲁肽注射液治疗44周后，在中国肥胖非糖尿病受试者中减重的等效性。