Mesenchymal Stem Cell Transplantation

The purpose of this Phase I clinical trial is to evaluate the safety and potential treatment response of bone marrow-derived mesenchymal stem cells (MesenCell) in adult patients with moderate or severe chronic graft-versus-host disease (cGVHD) that is refractory to corticosteroid treatment. The main questions it seeks to answer are: * Is MesenCell infusion safe in patients with corticosteroid-refractory chronic graft-versus-host disease? * Can MesenCell treatment improve the clinical response and disease control in these patients? Participants will receive one to three intravenous infusions of MesenCell, according to the study protocol and be followed for 12 months after the last MesenCell infusion.

The goal of this clinical trial with historical control is to evaluate whether umbilical cord-derived mesenchymal stem cell (UC-MSC) therapy can improve clinical outcomes in infants with biliary atresia undergoing Kasai surgery before 90 days of age. The main questions it aims to answer are: Does UC-MSC therapy improve liver function parameters (bilirubin, albumin, liver enzymes, coagulation profile)? Does UC-MSC therapy reduce complications such as anemia, ascites, jaundice, and improve PELD scores? Does UC-MSC therapy improve overall survival compared to standard Kasai surgery alone? Researchers will compare the group receiving UC-MSC in 2025-2027 with a historical control group of patients who previously underwent Kasai surgery without UC-MSC therapy. Participants will: Undergo preoperative evaluation, including laboratory and imaging tests. Receive Kasai surgery combined with intraoperative trans-portal vein injection of 20 million UC-MSCs. Be monitored postoperatively through serial laboratory tests, imaging (Fibroscan), and clinical assessments at scheduled intervals. Be followed up for potential serious adverse events and survival outcomes.