Infection with tick-borne encephalitis virus (TBEV) can lead to severe neurological complications largely associated with the activation of innate immunity and inflammatory reactions in the tissues of the nervous system. In this regard, the study of factors, including viral factors, influencing these processes is underway. We analyzed the possible role of nonstructural protein 1 (NS1) of TBEV in the activation of innate immune response reactions in cells of the nervous system. SH-SY5Y neuroblastoma and DBTRG-05MG glioblastoma cells were transfected with a plasmid encoding NS1 or treated with extracellular vesicles of NS1-expressing HEK293T cells and then stimulated with polyinosinic-polycytidylic acid [poly(I:C)] to activate the innate immune response. It was found that poly(I:C) stimulation of NS1-expressing SH-SY5Y cells resulted in lower mRNA levels of the pro-inflammatory cytokines interleukin-1β(IL-1β) and tumor necrosis factor-α(TNF-α), as well as the innate immune response of the cytokine interferon-1β(IFN-β) and the interferon-stimulated gene 15 product (ISG15), compared to stimulated cells without NS1 expression. In addition, transcription of the sensor gene MDA5, which is responsible for activating gene transcription of these cytokines, was reduced in these cells. In NS1-expressing DBTRG-05MG stimulated cells, only the IL-1β mRNA content was reduced. Treatment of SH-SY5Y cells with extracellular vesicles from NS1-expressing cells followed by poly(I:C) stimulation resulted in increased mRNA levels of IL-6, TNF-α, and IFN-β, compared with stimulated cells treated with vesicles from non-NS1-expressing cells. No differences were detected in DBTRG-05MG cells with similar treatment. Based on these data, we can assume that TBEV NS1 plays a dual role in the formation of neuroinflammation during the infection, and we can consider this protein as a potential therapeutic target.

The discovery of a class of long noncoding RNAs (lncRNAs), including lncRNAs of the small nucleolar RNA (snoRNA) host gene family, SNHG, has led to growing interest in the study of both snoRNAs themselves and the genes encoding them. Currently, of the 232 known snoRNA genes, only 32 have been confirmed to have lncRNAs. At the same time, a positive correlation has been shown between the expression of lncRNAs and snoRNAs encoded by a common host gene of the SNHG family. Thus, lncRNA of the SNHG1 gene correlates with snoRNAs SNORD22 and SNORD25-31, and lncRNA of the SNHG16 gene, with snoRNAs SNORD1A, SNORD1B, and SNORD1C. There is evidence that SNHG lncRNAs can participate in oncogenesis both through regulatory functions inherent to lncRNAs and by influencing ribosome biogenesis. At the same time, information has accumulated on the "extraribosomal" functions of snoRNAs. In addition to a brief excursion into the biological functions of snoRNAs and SNHG lncRNAs, we present a comprehensive review of data on the role of these two types of noncoding RNAs in the pathogenesis of ovarian cancer, the most insidious cancer of the female reproductive system. The influence of these regulatory RNAs on the main processes of ovarian oncogenesis, such as apoptosis, epithelial-mesenchymal transition, cell cycle control, and DNA methylation mechanisms in this type of cancer is considered. The prospects for clinical application of regulatory RNAs due to their influence on the level of drug resistance are also discussed.

The main functional parts of the glymphatic system are perivascular spaces and surrounding astrocytes. Cerebrospinal fluid enters the brain parenchyma from subarachnoid cisterns through perivascular Virchow-Robin spaces and passes into the interstitium through aquaporin channels in astrocytes. Then, cerebrospinal fluid removes metabolic products and mixes with interstitial fluid. Outflow of cerebrospinal fluid with metabolic products from the brain parenchyma occurs in three ways. The first route is periarterial through intermuscular spaces in the middle layer of cerebral arteries. The second route is perivenous. The third route is lymphatic through meningeal or sinus-associated lymphatic vessels. They provide drainage of macromolecules and immunocompetent cells from the brain to the cervical lymph nodes. Gliomas are accompanied by inhibition of normal cerebrospinal fluid outflow pathways, mainly due to additional intracranial tissue, and compensatory cerebrospinal fluid outflow along the spinal cord. Reduced cerebrospinal fluid release with impaired outflow contribute to accumulation of toxic metabolic products, proinflammatory cytokines and chemokines. Transport of antigens to lymph nodes is inhibited that disrupts antitumor immunity. Impaired cerebrospinal fluid circulation also reduces the effectiveness of intracranial drug delivery. One of the mechanisms of pathogenesis of glioma metastasis is based on migration of tumor cells along classical and meningeal lymphatic pathways. Damage to the latter contributes to metastasis.

The majority of meningiomas - benign tumors with an extremely low metastasis tendency. Only singular observations of extracranial metastasis of WHO Grade I benign meningiomas are described in the literature. Despite the intensive study of meningiomas' molecular biology, there are currently no reliable markers indicating the possibility of their metastasis.

Surgery of meningiomas of the craniocervical region is one of the most difficult parts of neurosurgery due to the closeness of the brainstem, caudal group of the cranial nerves (CNs) and vertebral artery. According to the literature, suffering of the caudal group of CNs is between 20 and 55% according to different authors. In their dysfunction, the recovery of CNs is long-term and requires joint efforts by both the medical team and the patient and his family.

Malignant transformation of fibrous dysplasia in McCune-Albright syndrome is observed in less than 1% of cases, thus osteosarcoma is developing more frequently. According to the search in the PubMed database over the last 5 years, 13 publications were found, but none of them described cerebral cranium damage.

Craniopharyngiomas are benign tumors of the chiasmal-sellar region of adults and children, prone to local invasion and recurrence. There are two morphological types of craniopharyngiomas - adamantinomatous (in children and adults) and papillary (PCPs) (mainly in adults). PCPs are a rarer type (15-20%). In the literature of recent years devoted to PCPs, two main variants of these tumors are distinguished: 1) solid intraventricular (III ventricle) and 2) monocystic with a small tumor component located outside III ventricle.

To study the immediate and long-term results of multivisceral surgeries with pancreaticoduodenectomy for gastric cancer.

To analyze short-term outcomes of the McKeown esophagectomy in 4 cancer centers of the Russian Federation.

Dysregulation of apoptosis in diffuse B-large cell lymphoma (DLBCL) contributes to increased tumor proliferation, as well as the formation of resistance to treatment. One of the most relevant areas of molecular research is the study of the mechanisms of programmed cell death - apoptosis. The AIF (Apoptosis Inducing Factor) protein participates in the regulation of the caspase-independent pathway of cell death and is a potential predictor of the course of DLBCL.

Diffuse large B-cell lymphoma (DLBCL) is the most common type of non-Hodgkin lymphoma (NHL). Treatment of elderly patients with NHL has always been a challenge; however, treatment statistics have begun to show favorable results similar to those of younger patients with DLBCL, thanks to new treatment protocols. The aim of this study is to evaluate the impact of prognostic factors on survival and efficacy of therapy in elderly patients with DLBCL in the Republic of Crimea. This study included 87 patients diagnosed with DLBCL who were treated in the Department of Hematology and Chemotherapy of the N.A. Semashko Republican Clinical Hospital from 2008 to 2024. The mean age was 72 (65-89) years, and 13 (14,9%) patients were over 80 years old. The median follow-up time was 42 months, and 45 patients (51,7%) died during the follow-up period. The median overall survival (OS) was 55 months, and the median progression-free survival was calculated as 27 months. Sixty-three patients (72,4%) received standard therapy R-CHOP. Complete response was achieved in 46 patients (52,9%). The median survival for patients with complete response was 136 months (p<0,001); however, OS was not statistically different between elderly (>80 years) and young patients (p=0,236). According to our results, we believe that the opportunity to undergo standard therapy R-CHOP is vital for the survival of elderly patients with DLBCL.

DICER1 syndrome is a rare monogenic disease with autosomal dominant inheritance. DICER1 protein is involved in the regulation of gene expression by microRNAs. Changes in the expression of DICER1 can be associated with various cancers. A 13,8-year-old girl with a history of embryonal rhabdomyosarcoma (ERMS) of uterine cervix and vagina excised at 6 months of age is presented with a thyroid follicular nodular disease (TFND). Molecular genetic examination revealed a heterozygous pathogenic variant p.Arg1003Ter in the DICER1 gene (NM_030621.4). The presented case emphasizes the importance of molecular genetic diagnosis of DICER1 syndrome in a diagnostic algorithm in the management of patients with TFND and history of malignancy. Considering ERMS of genital tract as a probable component of DICER1 syndrome it is necessary to screen for other manifestations of the disease as well.

Medullary thyroid carcinoma is a rare aggressive tumor of thyroid gland. Due to its neuroendocrine origine medullary thyroid carcinoma can be the source of ectopic production of different peptides and hormones. We describe a unique case of severe ACTH-dependent Cushing's syndrome due to ectopic corticotropin production by medullary thyroid carcinoma in a male patient of 39 years old with calcitonin level more than 4000 pg/ml (&lt;11,8), thyroid nodule, multiple neck jugular and central lymphnodes. The potassium level was 1,34 mmol/l (3,5-5,1), hypercortisolemia up to 1613,2 nmol/l (185-624) with elevated level of ACTH up to 24,7 pmol/l (1,03-10,74). After the correction of water and electrolytes disorders an operation was performed - thyroidectomy, central and lateral neck dissection. Postoperative calcitonin decreased to 126 pg/ml (&lt;11,8), calcium and parathormone blood levels remained normal. The potassium level didn't decrease without any pharmacological treatment. There was a sharp fall in postoperative blood levels of cortisol and ACTH. The hormonal replacement treatment with hydrocortisone was induced. Morphological examination showed medullary carcinoma with ACTH production in tumor nodule, with metastatic neck lymph nodes. Thus this is a rare case and successful treatment of patient with severe hypercortisolism by thyroidectomy and neck lymphnodes dissection.

 Analysis and assessment of the role of convolutional neural networks in the cytological diagnosis of the thyroid pathology, exploring their potential for increasing the accuracy and automation of diagnostic processes.

Despite the abundance of publications, the interpretation of imaging techniques such as optical coherence tomography (OCT) remains challenging in the differential diagnosis of intraocular tumors (IOTs), particularly - early choroidal melanomas. This article analyzes OCT findings in 15 patients whose initial diagnosis of "choroidal hemangioma" was revised to "choroidal melanoma" in 11 cases and to "progressive nevus" in 4 cases. The mean tumor prominence was 2.22±0.82 mm, and the mean diameter was 8.01±2.72 mm. The analysis identified OCT patterns frequently responsible for diagnostic errors, such as cystoid changes and the "subretinal cleft." Therefore, for accurate diagnosis and to avoid treatment planning errors, OCT findings must be interpreted in conjunction with fundus examination and in the context of patient's medical history.

Destruction of tumor foci in retinoblastoma (RB) is performed using both chemotherapeutic and local treatment methods. The number of published works devoted to the use of transpupillary thermotherapy (TTT) of small RBs in combined systemic and local chemotherapy is very limited, which determined the relevance of this study.

Valuate the effectiveness of autologous fat transplantation into post-lymphadenectomy cavity for prevention of lymphorrhea after total mastectomy with three-level lymphadenectomy in patients with breast cancer.

To study the incidence and risk factors of regional lymph node metastases in patients with early primary operable prognostically unfavorable breast cancer.

MicroRNAs in tissues and biological fluids represent a promising class of biomarkers for the molecular diagnostics and therapy of numerous diseases, including oncological diseases. Biomarkers based on easily accessible biological fluids, primarily blood-based biomarkers, are of particular value for diagnostic and prognostic purposes. To explore the potential of microRNAs as prognostic cancer markers and targets for molecular therapy, global microRNA profiling is required, which is provided by next-generation sequencing (NGS). NGS offers high sensitivity, single nucleotide resolution, and the possibility of profiling a large number of samples in parallel. Despite the promising potential of microRNAs as biomarkers and the growing number of works in this area, the literature does not address in sufficient detail the problems associated with sample preparation methods, the specifics of library preparation for microRNA sequencing, and the difficulties of quantitative analysis. Protocols for creating libraries for microRNA sequencing present specific challenges and require selecting conditions for each type of biological sample. Here, we present in detail the preparation of libraries for microRNA sequencing from pituitary adenoma tumor tissue and blood plasma of patients with acromegaly on the Illumina platform. We discuss the difficulties and limitations of the methods and evaluate the effectiveness of sequencing plasma and brain samples. This work can serve as a guide for researchers studying the mechanisms of microRNA regulation in endocrine diseases of the pituitary gland and will also allow for the adaptation of technical procedures for various biological samples in relation to other pathologies.

Doxorubicin (DOX) is a widely used cytotoxic drug known for its high antitumor activity; however, its use is associated with side effects. The development of DOX delivery systems that can minimize systemic toxicity and enhance therapeutic efficacy is an urgent task in modern oncology. We studied the process of loading nanoparticles (NPs) with DOX under conditions that promote DOX precipitation to achieve maximum sorption efficiency. For this purpose, polymer-stabilized magnetic NPs were synthesized, and the efficiency of loading and sedimentation was examined based on the buffer type, DOX concentration, and incubation time with the drug. Our findings indicated that in solutions with the most pronounced DOX sedimentation (phosphate and borate buffers), loading was most effective. In a phosphate buffer with an initial DOX concentration of 667 μg/mL, the loading was 886 mg DOX/g NP. The sorption of DOX on NPs under these conditions reached 85% within the first hour and increased to 90% within 3 hours. The release of DOX from NPs was 25% at pH 7.4 and 96% at pH 5.4. Analysis of the survival of EMT-HER2 breast cancer cells demonstrated that the cytotoxicity of NPs loaded with DOX under sedimentation conditions was eight times higher than that of NPs loaded at a concentration of 20 μg/mL, where DOX did not form a sediment. These results suggest that NPs loaded with DOX under sedimentation conditions can be considered an effective delivery system that not only maintains the cytotoxic properties of DOX but also significantly enhances the content and release of the delivered drug.