Thrombotic Microangiopathy (TMA) Associated with Allogeneic Hematopoietic Stem Cell Transplantation (HSCT) is a serious complication that is associated with increased morbidity, related to multiple organ failure, with increased mortality in transplant patients. The incidence and evolution of TMA, especially in the adult population, is unclear due to the lack of early systematic screening and clear criteria for its diagnosis. For this reason, we designed this protocol to study the incidence and evolution of TMA Associated with allogeneic HSCT in adult patients from Argentina.
Adult patients (≥ 18 years) undergoing allogeneic HSCT in specialized centers that, as part of their usual follow-up protocol, carry out basic screening (laboratory/clinical) for TMA and in which patients consent (within the general transplant consent), to have their data used in observational studies.
Patients with ≥ 3/laboratory/clinical diagnostic markers of TMA in two consecutive assessments within 14 days, namely: 1-Elevated Schistocytes in peripheral blood; 2-LDH above the upper normal limit; 3-De novo thrombocytopenia or requirement for platelet transfusion; 4-De novo anemia or requirement for red blood cell transfusion; 5-High blood pressure (≥140/90); 6-Protein/creatinine ratio > 1mg/mg or proteinuria ≥ 30mg/dl in a random sample).
Patients with suspected/diagnosed TMA who have signed the specific consent for the study.
Participation in an interventional treatment study of any therapy for TMA.
All adult patients with Allogeneic Hematopoietic Stem Cell Transplantation (HSCT) will be candidates for this study
Cohort
Prospective
Not listed
Incidence of TMA in adult patients receiving allogeneic HSCT in specialized centers in Argentina
The incidence of TMA will be assessed by the presence of ≥ 4/diagnostic laboratory/clinical markers present in 2 successive assessments within 14 days or if TMA is identified histologically by tissue biopsy up to day 100 post-transplant. Laboratory/clinical diagnostic markers (Harmonizing Definitions for Diagnostic Criteria and Prognostic Assessment of Transplantation-Associated published by Schoettler et al Transplant Cell Ther. 2023) are: 1-Elevated schistocytes in peripheral blood; 2-LDH above the upper limit of normal; 3-De novo thrombocytopenia or requirement for platelet transfusion; 4-De novo anemia or requirement for red blood cell transfusion; 5-High blood pressure (≥140/90); 6-Protein/creatinine ratio \> 1 mg/mg or proteinuria ≥ 30 mg/dl in a random sample; 7-sC5b-9 above the upper limit of normal.
Overall Survival
Proportion of TMA patients alive at each evaluation time frame
Non-relapse Mortality
Proportion of TMA patients that have died (death from any cause with exception of death due to progression or recurrence of the underlying disease) at each evaluation time frame
Proportion of patients achieving TMA response
TMA response is defined through the presence of response criteria (platelet count ≥ 50,000/mm3, lactate dehydrogenase \< 1.5 upper limit of normal, absence of schistocytes (if present at baseline) and increase in eGFR ≥ 30% from baseline or interruption of dialysis for patients on dialysis treatment at baseline), at each evaluation time frame
Proportion of patients free of transfusion requirement
Assessed through the non-requirement of transfusion of red blood cells or platelets indicated for the management of TMA for ≥ 28 days, at each evaluation time frame (Transfusions required for causes other than TMA will not be considered within the evaluation of this endpoint)
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