Hematopoietic Stem Cell Transplantation - HLA Matching, Conditioning, and Engraftment Syndrome

A forty-three-year-old veterinary technician, feeling well and in complete remission from acute myeloid leukemia - and still headed for a transplant. Remission is not the same as cure: left alone, this disease relapses more often than anyone would like, which is why her team is moving straight to consolidation instead of watching and waiting. A full walkthrough of hematopoietic stem cell transplantation - the stem cell itself, allogeneic versus autologous, HLA matching from a sibling down to haploidentical and cord blood, conditioning intensity, and the two complications every transplant team has to catch early. What you'll learn: • Why remission is not cure, and why transplant timing matters • Allogeneic versus autologous - graft-versus-host disease traded for graft-versus-tumor • HLA matching, from a matched sibling down to haploidentical and cord blood • Myeloablative versus reduced-intensity conditioning, and what each one trades away • Telling engraftment syndrome apart from sinusoidal obstruction syndrome Key takeaway: Graft-versus-host disease and graft-versus-tumor come from the same T cells attacking the same foreign antigens - one is the cost, the other is the cure. ⏱ Chapters: 0:00 Meet the patient: AML in remission 0:33 The plan: allogeneic transplant from her brother 1:04 Learning objectives for this lecture 1:41 HPI: fatigue, bruising, and the AML diagnosis 2:14 Past history, and her brother as the donor 2:38 Physical exam: normal and fit for transplant 3:11 Defining a stem cell transplant 3:46 The stem cell: self-renewal and differentiation 4:20 The marrow niche and conditioning's role 4:54 Allogeneic versus autologous: the trade-offs 5:28 How to choose allo versus auto 6:03 How the graft-versus-tumor effect works 6:38 Transplant indications in malignant disease 7:12 Transplant indications in nonmalignant disease 7:47 Applying the logic to her AML 8:18 HLA class I versus class II 8:55 Typing HLA: the eight major antigens 9:30 The sibling donor: the best-case scenario 9:59 Searching registries when no sibling matches 10:28 A relative, imperfectly matched 11:01 Half-matched donors and post-transplant cyclophosphamide 11:33 Cord blood: advantages and trade-offs 12:05 Myeloablative conditioning: the intensive option 12:36 Reduced-intensity conditioning for older patients 13:10 Comparing peripheral blood, marrow, and cord 13:46 The transplant timeline, day by day 14:20 Immune recovery happens in sequence 14:54 Charting the immune reconstitution curve 15:25 Defining engraftment by ANC 500 15:59 Two mechanisms of post-transplant injury 16:33 The endothelial injury model 17:08 Recognizing engraftment syndrome 17:41 Treating engraftment syndrome with steroids 18:03 Sinusoidal obstruction syndrome: incidence and mechanism 18:33 SOS: clinical presentation 19:06 Diagnosing SOS: a pattern, not one test 19:41 SOS: prophylaxis and treatment 20:07 Common pitfalls to avoid 20:42 Back to the patient: assessment and plan 21:14 Five key takeaways to remember 21:50 References Part of Teaching Service - Hospital Rounds: education for residents and advanced practice providers. For clinician and trainee education only. Not medical advice; verify against current guidelines and institutional protocols before applying to patient care. #StemCellTransplant #BoneMarrowTransplant #AcuteMyeloidLeukemia #HLAMatching #GraftVersusHost #Hematology #Oncology #InternalMedicine #MedicalEducation #TransplantMedicine