Outcome of patients with Fanconi anemia developing myelodysplasia and acute leukemia who received allogeneic hematopoietic stem cell transplantation: A retrospective analysis on behalf of EBMT group

Stefano Giardino, Regis P de Latour, Mahmoud Aljurf, Dirk-Jan Eikema, Paul Bosman, Yves Bertrand, Abdelghani Tbakhi, Wolfgang Holter, Martin Bornhäuser, Claudia Rössig, Birgit Burkhardt, Marco Zecca, Boris Afanasyev, Gerard Michel, Arnold Ganser, Amal Alseraihy, Mouhab Ayas, Duygu Uckan-Cetinkaya, Benedicte Bruno, Katharine Patrick, Peter Bader, Maija Itälä-Remes, Vanderson Rocha, Charlotte Jubert, Miguel A Diaz, Peter J Shaw, Luiz G D Junior, Franco Locatelli, Nicolaus Kröger, Maura Faraci, Filomena Pierri, Edoardo Lanino, Maurizio Miano, Antonio Risitano, Marie Robin, Carlo Dufour
American Journal of Hematology 2020, 95 (7): 809-816
Allogeneic hematopoietic stem cell transplantation (allo-HSCT) is curative for bone marrow failure in patients with Fanconi anemia (FA), but the presence of a malignant transformation is associated with a poor prognosis and the management of these patients is still challenging. We analyzed outcome of 74 FA patients with a diagnosis of myelodysplastic syndrome (n = 35), acute leukemia (n = 35) or with cytogenetic abnormalities (n = 4), who underwent allo-HSCT from 1999 to 2016 in EBMT network. Type of diagnosis, pre-HSCT cytoreductive therapies and related toxicities, disease status pre-HSCT, donor type, and conditioning regimen were considered as main variables potentially influencing outcome. The 5-year OS and EFS were 42% (30-53%) and 39% (27-51%), respectively. Patients transplanted in CR showed better OS compared with those transplanted in presence of an active malignant disease (OS:71%[48-95] vs 37% [24-50],P = .04), while none of the other variables considered had an impact. Twenty-two patients received pre-HSCT cytoreduction and 9/22 showed a grade 3-4 toxicity, without any lethal event or negative influence on survival after HSCT(OS:toxicity pre-HSCT 48% [20-75%] vs no-toxicity 51% [25-78%],P = .98). The cumulative incidence of day-100 grade II-IV a-GvHD and of 5-year c-GvHD were 38% (26-50%) and 40% (28-52%). Non-relapse-related mortality and incidence of relapse at 5-years were 40% (29-52%) and 21% (11-30%) respectively, without any significant impact of the tested variables. Causes of death were transplant-related events in most patients (34 out of the 42 deaths, 81%). This analysis confirms the poor outcome of transformed FA patients and identifies the importance of achieving CR pre-HSCT, suggesting that, in a newly diagnosed transformed FA patient, a cytoreductive approach pre-HSCT should be considered if a donor have been secured.

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