Цель. Оценить прогностическое значение сложного кариотипа, включающего аномалии del(5q),-7, del(7q) при острых миелоидных лейкозах (ОМЛ) у больных после аллогенной трансплантации гемопоэтических стволовых клеток (аллоТГСК). Материалы и методы. Обследовано 44 больных ОМЛ с аномалиями хромосомы 5 и/или 7 (22 женского и 22 мужского пола в возрасте от 1,2 до 67 лет, медиана 31,2 года). Проведен анализ предикторов общей (ОВ) и бессобытийной выживаемости (БСВ) после аллоТГСК у больных с различными клиническими, трансплантационными и цитогенетическими характеристиками. Результаты. До аллоТГСК сложный кариотип (≥ 3 хромосомных нарушений) был выявлен у 19 (43 %) больных, моносомный кариотип-у 8 (18 %). По данным однофакторного анализа, показатели ОВ и БСВ после аллоТГСК отличались у больных различных возрастных групп (≥ 18 vs < 18 лет; p = 0,01 и p = 0,05 соответственно), с различным клиническим статусом болезни на момент трансплантации (1 ремиссия vs другой статус; p = 0,1 и p = 0,008 соответственно), со сложным кариотипом и без такового (СК-vs СК+; p = 0,05 и p = 0,002 соответственно), с моносомным кариотипом и без такового (МК+ vs МК-; p = 0,009 только для БСВ) и в зависимости от источника стволовых клеток (костный мозг vs другие источники; p = 0,03 только для ОВ). Многофакторный анализ подтвердил, что независимыми предикторами ухудшения ОВ и БСВ были возраст 18 лет и старше (p = 0,02 и p = 0,01 соответственно), активная стадия заболевания на момент аллоТГСК (p = 0,04 и p = 0,005 соответственно), СК (p = 0,04 и p = 0,0008 соответственно) и когда источником

Aim. To estimate the efficacy of chemotherapy in acute leukemia patients resistant to previous standard treatment according to the series measurement of WT1 expression. Materials & Methods. The series measurement of WT1 expression formed the basis of the efficacy estimation of induction chemotherapy in 31 patients (15 men and 16 women aged from 3 months to 68 years; the median age was 28 years) with prognostically unfavourable variants of acute myeloid (AML) and lymphoblastic leukemia (ALL) (23 AML and 8 ALL patients). The WT1 gene expression was measured at baseline and 2-3 weeks after the treatment by the quantitative real-time PCR. The threshold level for detection was 250 copies of WT1/10⁴ copies of ABL. The cytogenetic profile of leukemia cells was assessed by standard cytogenetics and FISH. Results. The baseline expression level of WT1 varied from 305 to 58,569 copies/10⁴ copies of ABL. The expected reduction of WT1 expression after the first induction chemotherapy treatment was reported in 22/23 (96 %) AML patients and in 6/8 (75 %) ALL patients. According to our results WT1 expression reached the threshold in 13/31 (42 %) patients, including 9 AML patients and 4 ALL patients. After 11/31 (35 %) patients received the second course of treatment, WT1 expression level became normal in 8 cases (5 ALL and 3 AML patients). Despite high dose chemotherapy, HSCT and such agents as blinatumomab and gemtuzumab, an unfavourable outcome was observed in 18/31 (58 %) patients including 6 patients with complex karyotype (CK+) and 2 patients with monosomal karyotype (MK+). Once the MK+ and CK+ combination was observed, in another case the MK+ was combined with the prognostically unfavourable inv(3)(q21q26) inversion. Conclusion. Our results show that the molecular monitoring should be included as part of treatment of the prognostically unfavourable acute leukemia. The WT1 gene was shown to be the most appropriate marker. WT1 expression was shown to correlate with the common fusion genes allowing to estimate the blast cell count at the molecular level.

Aim. To evaluate the prognostic impact of the different cytogenetic characteristics, including the modal number, the number of chromosomal aberrations in a complex karyotype, and adverse chromosomal abnormalities (ACA) (-7/7q-, -5/5q-, -17/17p-, t(6; 9)(p22; q34)) on the results of allogeneic hematopoietic stem cell transplantation (allo-HSCT) in patients with hyperdiploid acute myeloid leukemia (H-AML). Methods. Forty seven H-AML patients (21 women and 26 men, aged from 1 to 58 years, median - 23.9 years) were examined. The analysis of overall (OS) and event-free survival (EFS) predictors after allo-HSCT in patients with different clinical, transplant and cytogenetic characteristics was performed. Results. The modal number of chromosomes (MN) of 4748 was the most common one in the karyotype which was observed in 31 (66 %) patients. High hyperdiploidy with the modal number of 49-65 was identified in 13 (28 %) patients, near-triploid and near-tetraploid karyotypes were found in 3 (6 %) patients. Quantitative chromosomal abnormalities were nonrandom. Chromosome 8 (50 %), 21 (32 %), 13 (16 %) and 22 (16 %) trisomy was the most common one. Structural chromosomal abnormalities were detected in 22 (47 %) patients, at that, ACA were found in 7 (19 %) patients. In univariate analysis, the OS and EFS after allo-HSCT differed in patients with different clinical status (remission vs. active disease; p = 0.003 and p = 0.002, respectively), different chromosomal abnormalities in hyperdiploid karyotype (ACA- vs. ACA+; p = 0.001 and p = 0.03, respectively). An additional analysis of selected patients group with a structurally complex karyotype (n = 19) showed, that patients without ACA had a higher OS than patients with ACA (p = 0.03). In multivariate analysis, the disease status (relapse) at allo-HSCT was an independent predictor of decreased OS and EFS (p = 0.004 и p = 0.006, respectively), as well as the presence of the ACA (p = 0.002 only for OS). Conclusion. ACA were high-risk factors in H-AML patients received allo-HSCT. Therefore, the patients with formal criteria of a complex karyotype should not be automatically included in the cytogenetic unfavorable risk group.

Aim. To evaluate the impact of additional chromosomal aberrations on outcomes of allogeneic hematopoietic stem cell transplantation (allo-HSCT) in patients with acute myeloid leukemia (AML) with t(8;21)(q22;q22)/RUNX1-RUNX1T1 translocation. Methods. Twenty-five AML patients with t(8;21)(q22;q22)/ RUNX1-RUNX1T1 translocation (10 women and 15 men, aged from 2 to 58 years; median 20.2) were examined. Analysis of overall (OS) and event-free survival (EFS) predictors after allo-HSCT in patients with different clinical, transplant and cytogenetic characteristics was performed. Results. The additional cytogenetic abnormalities were found in 13 (52 %) patients before the transplantation, at that, complex karyotype with three or more chromosomal abnormalities were registered in 9 (69 %) patients. The univariate analysis showed that OS and EFS after allo-HSCT differed in patients with different characteristics such as age (p = 0.03; p = 0.0006), clinical status at transplantation (p = 0.0002; p = 0,006), donor type (p = 0.0003; p = 0.002), the interval from diagnosis of leukemia to allo-HSCT (p = 0,008, for OS only), additional cytogenetic abnormalities (p = 0.03; p = 0.009) and complex karyotype (p = 0.004; p = 0.0003), respectively. In multivariate analysis, independent predictors of OS were donor type (p = 0.01), the interval from diagnosis of leukemia to allo-HSCT (p = 0.01), and additional cytogenetic abnormalities in karyotype (p = 0.04), as well as donor type (p = 0.04) and patient’s age (p = 0.004) for EFS. Conclusion. AML with t(8;21)(q22;q22)/RUNX1-RUNX1T1 translocation is a heterogeneous disease. The prognosis in patients with the additional cytogenetic abnormalities, especially in those with the complex karyotype, is worse both after the standard chemotherapy (i.e. before allo-HSCT), and after allo-HSCT.

В работе представлены результаты расширенного генетического исследования 39 детей, наблюдавшихся в КДЦ «Охрана здоровья матери и ребенка» (г. Екатеринбург) с диагнозом «гиперфенилаланинемия». Анализ результатов обследования детей (у 13-ти пробандов наличие варианта R408W в гетерозиготном состоянии) показал, что поиск рекуррентных вариантов гена с использованием панели для ДНК-диагностики не дает ожидаемой верификации диагноза и требует дополнительного тестирования. Прямое секвенирование гена PAH позволило подтвердить диагноз «фенилкетонурия» (ФКУ) у 35 пробандов (89,8%) - у них обнаружено по 2 измененных аллеля. Еще у 4-х пациентов обнаружен только один патогенный вариант. Исследование ДНК родителей и сибсов указало на семейный вариант наследования всех выявленных мутаций. В результате проведенного исследования спектр патологии гена PAH, характерный для популяции Свердловской области, претерпел существенные изменения, что требует нового подхода к генодиагностике данной наследственной патологии в регионе. The paper presents the results of an extended genetic study of 39 children observed in the MC “Health Care of Mother and Child” (Ekaterinburg) with a «hyperphenylalaninemia». An analysis of the previously known results of the study in these patients (the p. R408W variant in the heterozygous in 13 probands) showed that the search for recurrent gene variants using the panel does not give the expected proving of the diagnosis and requires additional testing. Applying the «gold standard» of diagnosis - direct sequencing of the PAH gene, the diagnosis of phenylketonuria (PKU) was confirmed in 35 probands (89.8%) - 2 altered alleles were found in them, one pathogenic variant was found in 4 others. A study of the DNA of parents and siblings indicated a families’ variants of inheritance for all identified mutations. As a result of the study, the pathology spectrum of the PAH gene, currently in use for the population of the Sverdlovsk region, has undergone significant changes, which require a new approach to the genetic diagnosis of this hereditary pathology in the region.