A Clinical Trial to Evaluate the Safety, Efficacy, and Pharmacokinetics of MegaLT Injection for Treating Refractory Thrombocytopenia Following Radiotherapy, Chemotherapy, or Transplantation.

"Three dose groups were set: 1×10\^6/kg, 5×10\^6/kg, and 1×10\^7/kg. The dose escalation was carried out in ascending order using a 3+3 design. To ensure participant safety, enrollment followed a 1+2 rule. Specifically, the first participant in each dose group received the cell infusion and was observed for 14 days. If no dose-limiting toxicity (DLT) was observed, the remaining two participants could then be enrolled and receive cell therapy at the same dose level."