A Study to Evaluate the Safety and Efficacy of PN20 in the Treatment of Thrombocytopenia in Patients With Chronic Liver Disease Undergoing an Elective Procedure

Inclusion Criteria: * Age ≥ 18 years, Male or female * Diagnosed with chronic liver disease-related thrombocytopenia (baseline platelet count \< 50 × 10⁹/L), Child-Pugh score A or B; * Planned elective invasive procedure or minor surgery within Days 7-15 post-enrollment, excluding laparotomy, thoracotomy, craniotomy, open-heart surgery, organ resection, or partial organ resection (for tissue biopsy and other types of tissue resection, enrollment is permitted if the investigator considers the risk of bleeding and invasiveness to be comparable to or lower than that of the procedures listed in the surgical examples list); * Eastern Cooperative Oncology Group (ECOG) performance status score of 0 or 1; * Women of childbearing potential must have a negative pregnancy test * Agree to use reliable contraception through 3 months post-study. * Participants must understand the study requirements and provide written informed consent. Exclusion Criteria: * The following conditions or medical history: * Presence of other conditions that may lead to thrombocytopenia; * History of thrombotic or significant cardiovascular events; * Uncontrolled bleeding; * Advanced liver cancer; * Severe comorbidities; * Currently using or with a history of the following treatments: * Recent major surgery or splenectomy; * Liver transplant; * Recent therapies affecting platelet counts; * Significant lab abnormalities; * Recent participation in other clinical trials; * Known hypersensitivity to the investigational productstudy drug； * Active substance abuse; * Any condition deemed by the investigator to compromise safety or study integrity.