High-Altitude Hematology Observation-Stem Cell Transplantation (HALO-SCT)

This study is observing how patients with blood diseases respond to stem cell transplantation (bone marrow transplant) when the procedure is performed at high altitude — specifically at a hospital in Qinghai, China, which sits at significant elevation. Researchers want to understand if high altitude affects recovery, blood counts, and outcomes after transplant. **You may be eligible if...** - You have been diagnosed with a blood disease requiring a stem cell transplant - You were admitted to the transplant center at Qinghai University Affiliated Hospital on or after September 1, 2023 - You are undergoing or have undergone a stem cell transplant - You have signed informed consent **You may NOT be eligible if...** - You have severe other illnesses or logistical circumstances that make long-term follow-up impossible - You have substance abuse issues that would interfere with study participation - The investigators judge that participating would put you at risk or compromise your safety or compliance Talk to your doctor to see if this trial is right for you.