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Introduction. Mutations in the TP53 gene in patients with mantle cell lymphoma (MCL TP53+) are associated with a low response to intensive chemotherapy (CT) and adverse outcomes. Allogeneic haematopoietic stem cells transplantation (allo-HSCT) is a curative approach in MCL-TP53+ patients.Aim. Efficacy and safety assessment of allo-HSCT in MCL-TP53+ patients.Main findings. During 2016–2020, allo-HSCT in MCL TP53+ was performed in three patients. Two of them were grafted from HLA-identical unrelated donors, and one — from a haploidentical donor. Pre-transplant conditioning was “fludarabine + treosulfan + melphalan” in one case, and “fludarabine + busulfan” — in the other two. In three patients, leukocyte and platelet counts were recovered at days +18 and +20, +17 and +21, +19 and +16 after allo-HSCT, respectively. Acute graft-versushost disease (aGVHD) was observed in all patients (grade I — in 2 patients, grade IV — in 1 patient). One patient developed chronic GVHD (cGVHD) of moderate grade. All three patients exhibited complete remission and 100% donor chimerism in allo-HSCT follow-up of 6, 15 and 40 months, respectively.

Diffuse large B-cell lymphoma (DLBCL) is the most common lymphoid tumor in adults which is associated with approximately 30-40 % of all non-Hodgkin’s lymphomas. Diagnostic criteria include diffuse growth of large anaplastic tumor cells, expression of В-cell markers, and a high proliferative index. Due to the development of molecular genetic technologies it became obvious that underlying cause of clinical diversity is a huge amount of genetic failures which determine epigenetic modification of gene expression, activation variability of certain signaling pathways, and immunological properties of tumor cells. The study and systemization of molecular markers present a significant trend in DLBCL diagnosis and treatment. This review discusses most important molecular markers and current view on their clinical value.

Diffuse large B-cell lymphoma is categorized by gene expression profiling into germinal center (GCB) and activated B-cell (ABC) subtype, also referred to as non-germinal center B-cell (non-GCB) by immunohistochemistry. ABC DLBCL is characterized by NF-κB pathway activation and high expression of IRF4/MUM1, a key transcription factor in B cell differentiation. Patients with ABC DLBCL have a significantly worse outcome when treated with standard chemotherapy (R-CHOP). Lenalidomide have shown activity in the ABC-DLBCL in combination with R-CHOP. But about 40% of patients remain resistant. We present the experience of treatment of a patient with generalized non-GCB-DLBCL using the intensive protocol R-mNHL-BFM-90 with lenalidomide.

Double-hit lymphoma (DHL) is a rare aggressive B-cell lymphoma with concomitant c-MYC, BCL2 or BCL6 gene rearrangements, which is characterized by the high frequency of extranodal lesions and by resistance to chemotherapy. The median survival does not exceed 18 months in patients with this disease. The majority of DHL is represented by с-MYC/BCL2 cases. The combination of c-MYC/BCL6 occurs rarely (5-8%). The paper describes a case of DHL with concomitant c-MYC and BCL6 gene rearrangements, which mimics diffuse large B-cell lymphoma, leg-type.'Double-hit' лимфома (DHL) - редкая агрессивная В-клеточная лимфатическая опухоль с сочетанной перестройкой генов с-MYC, BCL2 или BCL6, характеризующаяся высокой частотой экстранодальных поражений и резистентностью к химиотерапии. Медиана продолжительности жизни при данном заболевании не превышает 18 мес. Большинство DHL представлено случаями с-MYC/BCL2. Сочетание с-MYC/BCL6 встречается редко (5-8%). Представлен случай DHL-лимфомы с сочетанной реаранжировкой генов c-MYC и BCL6, протекающей под маской ДВККЛ leg-type.