Background & Aims. At present, the allogeneic hematopoietic stem cell transplantation (allo-HSCT) is the only treatment option with curative potential in patients with myelofibrosis (MF), especially in intermediate and high risk categories. The aim of the study is to perform a retrospective analysis of alloHSCT outcomes in MF patients. Materials & Methods. Outcomes of allo-HSCT in 11 intermediate-2 (n = 3) and high (n = 6) risk patients (based on Dynamic International Prognostic Scoring Scale, DIPSSplus) performed in the R.M. Gorbacheva Scientific Research Institute of Pediatric Hematology and Transplantation over the period from 2005 till 2015 were analyzed in the study. Two more patients underwent allo-HSCT in MF blast phase. Two patients received ruxolitinib before allo-HSCT and 1 patient before and after allo-HSCT. Reduced intensity conditioning regimen was used in all cases. Results. Primary engraftment was documented in 8 patients. 72 % of patients achieved complete hematological remission. Molecular remission and myelofibrosis regression were confirmed in 5 patients. 5 of 11 patients were still with remission and followed-up by the date of the paper submission. The overall two-year survival was 46 %. Conclusion. Allo-HSCT is an effective treatment option for MF patients. Further trials are required to evaluate an optimal timing for allo-HSCT in MF patients and efficacy of Janus kinase (JAK) inhibitors as pre- and posttransplant therapy in MF.

Цель. Оценить в соответствии со строгими критериями частоту возникновения, предтрансплантационные факторы риска и исходы тяжелой гипофункции трансплантата (тГФТ) после аллогенной трансплантации гемопоэтических стволовых клеток (аллоТГСК) у взрослых. Материалы и методы. В исследование включено 710 взрослых пациентов (медиана возраста 31 год, диапазон 18-70 лет; 55 % мужчин, 45 % женщин) с различными гематологическими заболеваниями и документированным приживлением трансплантата после аллоТГСК от совместимого сиблинга (20 %), неродственного (67 %) и гаплоидентичного (13 %) доноров в период с 2008 по 2016 г. Миелоаблативное кондиционирование и режимы со сниженной интенсивностью использовались у 30 и 70 % больных соответственно. Критерии тГФТ: цитопения в 2 линиях и более (тромбоциты < 20 × 10 9 /л, абсолютное число нейтрофилов < 0,5 × 10 9 /л, гемоглобин < 70 г/л в любой момент времени после документированного приживления), полный или стабильный смешанный донорский химеризм > 90 % и отсутствие признаков рецидива, отторжения и тяжелой острой реакции «трансплантат против хозяина». Анализировались следующие факторы: возраст, пол, диагноз, наличие/отсутствие ремиссии при острых лейкозах, уровень ферритина крови, тип донора, HLA-совместимость, совместимость по группе крови и полу, источник трансплантата, число трансплантированных клеток CD34+, режим кондиционирования. Многофакторный анализ включал параметры со значением p < 0,05 в однофакторном анализе. Результаты. тГФТ после аллоТГСК диагностирована у 103 пациентов с 2-летней кумулятивной частотой 15 % (95%-й доверительный интервал [95% ДИ] 12-18 %).

The study assessed the outcomes of allogeneic hematopoietic stem cell transplantation (allo-HSCT) in 34 patients with cytogenetically verified variants of myelodysplastic syndrome (MDS) with trisomy 8 and/or monosomy 7, who were treated at the RM Gorbacheva Scientific Research Institute of Pediatric Oncology, Hematology and Transplantation from 2013 to 2020. Both adult and pediatric MDS were analyzed without excluding the variants with two additional chromosomal abnormalities or complex karyotype. The study revealed that а) allo-HSCT should be performed in the treatment of both MDS variants; b) the outcomes of trisomy 8 treatment appeared to be better; c) children with monosomy 7 showed a higher rate of toxic complications in allo-HSCT.

The present paper provides evidence for a high detection rate of BAALC gene overexpression, also combined with WT1 gene overexpression, in patients with myelodysplastic syndromes (MDS) and FISH-verified chromosome defects. The BAALC and WT1 gene expression profiling of 16 MDS patients (6 out of them received allogeneic hematopoietic stem cell transplantation) showed an increased BAALC expression in 14 patients. The expression level in 2 patients was near the cut-off. Low expression levels were identified in a female patient with isolated 5q deletion in karyotype and also with its combination with complex karyotype. On the other hand, the highest expression levels were reported in patients with normal karyotype and 3q26 locus rearrangement, which was associated with EVI1 gene overexpression. Since the BAALC expression level, at least in patients with the major (except for М3 and М7) FAB-variants of acute myeloid leukemias (AML), was closely associated with BAALC-producing precursor cells of leukemia clone, a profound study of this phenomenon in MDS patients seems to be important for understanding the finest mechanisms underlying the pathogenesis of AML and AML relapses on the level of precursor cells.