Relapsed ACUTE Leukemia after Hematopoietic STEM CELL Transplantation
Authors: Acosta-Maldonado Brenda Lizeth , Vásquez Diaz Jhohan Estuardo , Barranco Gilberto Israel , Valero-Saldaña Luis Manuel , Rivas-Vera Silvia 
Published: October 2019

Abstract
BACKGROUND
In recent decades the results in the treatment of acute leukemia's have improved, this due to the optimization of chemotherapy regimens, risk stratification, monitoring of minimal residual disease, development of new agents and best supportive care.
Allogeneic hematopoietic stem cell transplantation (HSCT) is a standard option for patients at high risk of relapse. Allogeneic hematopoietic stem cell transplantation (HSCT) is a standard option for patients at high risk relapse. However, patients who relapse after transplantation have a poor prognosis because of subsequent treatments do not confer a success survival. The EBMT has reported a 5.5 months median survival after relapse, overall survival of 8% of ALL and 10-20% to AML to 3 years.
AIMS
Report outcomes of patients with relapsed acute leukemia after hematopoietic stem cell transplantation (HSCT).
METHODS
Retrospective analysis of our hematopoietic stem cell transplantation database was undertaken, containing 81 patients with acute leukemia presenting of a period of 10 years.
RESULTS
We Identified 81 patients, 47 (58%) were men. Median age for ALL was 20 years (7-55 yr) and for AML patients was 34 (15-64yr). ALL was the most frequent diagnosis (61%), 28 patients had AML (35%), other leukemias (4%). 44% patients with ALL had Ph'Chr+.
60% of all patients underwent myeloablative regimen transplantation in first CR and 30% in second remission. The 95% of HSCT was performed allogeneic transplantation and the rest was autologous. In most cases the source of stem cells was peripheral blood.
Post-transplant relapse occurred in 51% and 54% of patients with ALL and AML, 10 and 12 months respectively. A total of 6 patients was underwent to second transplant with reduce intensity regimen with very poor response. Table 1 was shows the principal features of patients.
Table 1. CHARACTERISTIC ALL=49 % (n) AML =28 % (n) Other leukemia =3 % (n) Age at HSCTMedian (Range) 22 (15-55) 34 (17-64) 18 (16-35) Response before HSCT First CR 63 (31) 53 (15) 100 (3) Second CR 29 (14) 36 (10) 0 Third or more CR 2 (1) 4 (1) 0 Active disease 2 (1) 7 (2) 0 Allogeneic 98% (48) 93 (26) 66.7 (2) Autologous 2 (1) 7.1 (2) 33.2 (1) GVHD Acute 26.5 (13) 17.9 (5) 22.2 (1) Chronic 22.9 (11) 39.3 (11) 0 Relapsed Media time at relapsed 51 (25) 10 months 53.6 (15) 12 months 66.7 (2) Post-Relapse Treatment Without treatment Palliative CT Cytotoxic CT 32 (8) 24 (6) 44 (11) 26.7 (4) 13.3 (2) 60 (9) 0 100 (2) Response after re-induction CT CR Active disease 20 (5) 48 (12) 32 (8) 33.3 (5) 33.3 (5) 33.3 (5) 0 100 (2) 0 Second HSCT 4.1 (2) 14.3 (4) Relapsed at second HSCT 50 (1) 50 (2) Outcome Alive Dead 55.1 (27) 44.9 (22) 39.3 (11) 60.7 (17) 33.3 (1) 66.7 (2) 3-years OS 5-years OS Median 56% 43% 50 months A 3 years 44% A 5 years 34% 36 months 20 months RFS 1-year Median 56% 22 months 28% 5 Months 33% 10 months NRM Mortality to relapse 9.5 (2) 90.5 (19) 23.5 (4) 76.5 (13) O 100 (2)
CONCLUSION
Our results confirm that treatment options for high risk acute leukemic patients who relapse early after HSCT are limited with extremely poor prognosis, special in patient relapsed early post-transplant. More studies are needed to determinate the best treatment option for patient who relapse after HSCT.

Disclosures
No relevant conflicts of interest to declare.