Malignant brain tumors are noteworthy for a lot of genetic disorders that show itself as decreased or increased gene function of different genes and lead to tumor development. The differences in the molecular genetic profile can identify several subtypes of malignant gliomas, which are distinguished by both their clinical course and susceptibility to drugs. This can be the basis for developing individualized therapy options in patients with malignant gliomas.

Non-small cell lung cancer (NSCLC) comprises 80% of all lung cancers and is characterized by multiple genetic alterations such as loss of heterozygosity (LOH) and microsatellite instability (MSI). The aim of the study was to analyze of molecular-genetic alterations in tumor and tissue surrounding the tumor to determine genetic features of different histological types of NSCLC and its possible associations with clinicopathological parameters of patients. A microsatellite analysis of chromosomal regions 12p23.3, 2q35, 3p14.2, 3p22.2, 3p26.3, 9p22.1, 17p13.3 was performed. The frequency of genetic alterations in NSCLC was 50% in average. LOH/MSI in the tumor surrounding tissue at 2 and 5 cm. from tumor was not detected. There were statistically significant associations between LOH and/or MSI and the tumor stage, its histological type and smoking status. The found genetic alterations can be used as molecular markers of squamous cell lung cancer in difficult diagnostic cases and appraised as prognostic markers.

TNF is an inflammatory cytokine that involved in pathogenesis of different malignancies. Promoter single nucleotide polymorphism -238(G/A)TNF (rs361525) is investigated for the detection of susceptibility to the infectious, autoimmune and oncological diseases. The goal of the study was to investigate the association of-238(G/A)TNF polymorphism (rs361525) with breast cancer (BC) prognosis. -238(G/A) TNF allelic variants were detected by PCR-RFLP. We failed to reveal the genotype distributions disparity among groups with different stages of the disease, ER, PR or Her2/neu positive versus negative status. The AG genotype frequency was about 10% and there were no BC patients with AA genotype in all separated groups. However the overall survival was significantly lower for AG then for GG carriers with II stage or ER-positive BC. Our data suggest that -238(G/A)TNF polymorphism perhaps is not involved in the initiation of malignancies but it is a substantial factor of BC prognosis.

Chicken anemia virus gene encoding apoptin, a selective killer of cancer cells was synthesized and inserted into vaccinia virus (strain L-IVP) genome. The insertion has replaced major part of the viral C11R gene encoding viral growth factor (VGF), which is important for the virulence. The recombinant virus VVdGF-ApoS24/2 was obtained through the transient dominant selection technique with the use of puromycin resistance gene as the selective marker. The expression apoptin gene from a synthetic early-late promoter of vaccinia virus effectively provides accumulation of the protein in the cells infected with the VVdGF-ApoS24/2 virus. Despite the presence of virus growth factor signal peptide at apoptin N-terminal secretion of the recombinant protein into culture medium did not occur. The recombinant virus VVdGF-ApoS24/2 was found to have a significantly greater selective lyticactivity on human cancer cell lines (A549, A431, U87MG, RD and MCF7) as compared with the parent strain L-IVP and its variant VVdGF2/6 with the deletion of the C11R gene. The results suggest that the use of apoptin represents a promising approach for improving the natural anticancer activities of vaccinia virus.

We examined allelic imbalance (AI) on loci 17p13.1 (TP53), 1p36.1 (RUNX) and 16p22 (CDHI) and microsatellite instability (MI) with BAT26 in 78 patients with gastric cancer. We have shown a significant difference in the frequency of allelic imbalance of the studied loci among different types of gastric cancer. Frequency of AI in 16p22.1 (CDH1) (p = 0.023), 17p13.1 (TP53) (p = 0.038), microsatellite instability (p = 0.047) and AD two and more loci in a single sample (p = 0.0176) was significantly higher in the intestinal type of gastric cancer than in the diffuse type. We have shown, that, frequency of AI in 16p22.1 (CDH1), and AD two and more loci in a single sample, was higher in thetumors with high or moderate type of tumor cells differentiation (p = 0.0414, p = 0.0057 respectively). We found no significant differences in the groups with metastases in regional lymph nodes, different tumor stage, localization of tumors and the generalization process.

There are a lot of "death receptor" DR3/LARD mRNA variants that are formed during the alternative splicing. Membrane and soluble forms of the receptor are encoded with various types of the DR3/LARD mRNA and perform different functions. Using RT-PCR, the DR3/LARD mRNA spliced variants' frequency was measured in colon cancer patients' samples and cancer cell lines. In samples under investigation, four forms of the DR3/LARD mRNA were found with various frequencies. Two of them encoded the membrane receptors (LARD la mRNA and DR3beta mRNA) and other two expressed the soluble molecules (LARD 3 mRNA and soluble DR3beta mRNA). In blood of healthy volunteers 11 combinations (spectrums) of the DR3/LARD mRNA forms were revealed, and the "full" spectrum including all four variants of DR3/LARD mRNA dominated. In blood of colon cancer patients and tumour tissue samples, 6 DR3/LARD mRNA spectrums were found. The diversity of the DR3/LARD mRNA spectrums was decreased in colon cancer patients because of the frequency reduction of soluble DR3beta mRNA. Reduction of a variety of spectrums in cells of the patients was caused by decrease in occurrence of mRNA of the soluble DR3beta form. In samples of the tumor centers the spectrum with absence only mRNA of the soluble DR3beta form dominated. In blood of patients two spectrums prevailed: "full" range and presented mRNA LARD la and mRNA LARD 3. Only these two spectrums of mRNA DR3/LARD were also found in the tumor cell lines. Distinctions in occurrence of spectrums of DR3/LARD mRNA at healthy volunteers and colon cancer patients can define a different susceptibility of immunocompetent and tumor cells for apoptosis signals.

In 25-30% of breast cancer tumor cases amplification of chromosome fragment around the ERBB2 underlies the increased expression of genes adjacent to ERBB2. Increased expression of genes within ERBB2-containing am- plicons may have an impact not only on the growth and development of the tumor, but on the sensitivity of the tumor to different types of anti-cancer therapies. The initial cause of amplification and the exact borders of ERBB2-amplified chromosome fragment are still not completely characterized. No specific DNA sequences were found on the junction regions at intrachromosomal DNA amplification. We hypothesized that amplification borders can be specified by DNA structural peculiarities rather than the particular DNA sequence. This study focused on the mapping of ERBB2 amplification borders in breast cancer and the search for unusual structural features of DNA at the borders of the identified amplicons. The copy number of 10 genes adjacent to ERBB2 were evaluated by real time PCR in 162 breast cancer samples. Several ERBB2-containing amplicons of various lengths were revealed. In the majority of the analyzed samples, the borders of these amplicons were located within ZNFNIA3 and RARA genes. A bioinformatics analysis of the nucleotide sequence peculiarities around ERBB2 gene revealed the presence of AT-rich DNA regions with high degree of flexibility. These regions were able to form stable secondary structures. Positions of these sites strongly coincide with the positions of the ERBB2-containing amplicon borders found in real time PCR experiments. On the base of results obtained one can suppose that the structural features of DNA are involved in the formation of ERBB2-containing amplicon borders in breast cancer cells and the data are of importance for understanding the mechanisms of oncogene amplification.

We studied the localization of transmembrane receptor P185(HER2) in SKOV-3 and BT-474 cancer cells by fluorescence, confocal and electron immunomicroscopy. P185(HER2) is a marker of breast and ovarian tumors, it is considered as a target for anticancer therapy. It is extremely important to choose a universal immunicytotoxic agent applicable, first, to study the distribution of P185(HER2) in cancer cells, secondly, to remove P185(HER2) from the cell surface and, thirdly, to eliminate target cells. In this work for visualization of P185HER2 We prOposed immunocytotoxic system, consisting of the monoclonal miniantibody 4D5 scFv to extracellular P185E domain fused with two molecules of barnase (ribonuclease from Bacillus amyloliquefaciens) and of its specific inhibitor barstar. Fluorescence microscopy has showed that the module 4D5 scFv-dibarnase:barstar efficiently identified P185(HER2) on the surface of cancer cells. It was revealed by confocal microscopy that interaction with 4D5 scFv-dibarnase lead to internalization of P185(HER2). The localization of P185(HER) in human ovarian carcinoma cells SKOV-3 and breast carcinoma cells BT-474 was compared by electron microscopy using 4D5 scFv-dibarnase:barstar-Au and 4D5 scFv-dibarnase-Au complexes. P185(HER) distributed on the cell surface unequally with preferential localization on protrusions or close to their bases and in contacts between protrusions and cell membrane. At 37 degrees C, P185(HER2) internalized through coated pits and vesicles and concentrated in the endosomes and multivesicular bodies in the cells of both cell lines, as well as in lysosomes in cells BT-474.

This review summarizes current knowledge on the role of tumor exosomes and microvesicles in progression, metastasis, and angiogenesis of tumors, as well as in suppression of adaptive and innate immunity.

Breast cancer in men is 100 times less common than in women. The main risk factors include: the mutation of genes BRCA 1 and 2, Klinefelter's syndrome, alcohol, liver disease, obesity. Clinical examinations, mammography and ultrasound are informative and highly sensitive for early detection of these tumors, but are rarely implemented due to lack of awareness of general practitioners. Local treatment includes the Patey-Dyson mastectomy and radiation therapy. Adjuvant systemic therapy is determined by pTNM and typically involves tamoxifen.

Preliminary data are confirmed on the more rare prevalence of family history of diabetes mellitus (DM) in cancer patients, mainly females, with diabetes in comparison with diabetics without cancer pathology. Familial diabetes does not worsen additionally tumor characteristics against the same in patients with non-familial diabetes. More than that, familial diabetes in diabetics with breast cancer goes together with lesser size of tumor and demonstrates an inclination to the rarer distant metastases in breast and endometrial cancer patients. The signs of systemic DNA damage (evaluated, in particular, on the basis of 8-OH-dG serum levels) are pronounced in postmenopausal diabetic cancer patients with familial diabetes in lesser degree than in non-familial variant of DM. In toto, this allows to consider family history of DM in patients with type-2 diabetes as a particular factor of tumor growth containment, which mechanisms and causes, warrant further studies.

Previously, we showed the association of neoadjuvant chemotherapy (NAC) response with changing the expression vector (increase or decrease) of multidrug resistance genes (MDR) in breast tumors during chemotherapy. The aim of the present study was to evaluate the relation between changes in the expression vector of MDR genes and distant metastasis-free survival. Patients (n = 120) with breast cancer (T1-4N0-3M0) treated by 2-4 cycles of NAC (CAX, FAC, and taxane regimes) and 4 cycles of adjuvant chemotherapy (FAC) were included. TaqMan-based quantitative reverse transcriptase PCR (qRT-PCR) was used to estimate the expression of the following MDR genes: ABCB1, ABCC1, ABCC2, ABCC5, ABCG1, ABCG2, GSTP1, and MVP--in biopsies before NAC and in tumor samples after chemotherapy. Comparing the corresponding expression levels allowed us to identify the vector of expression change during NAC. The results showed that 5-year distant metastasis-free survival was 73-78% in patients with a decrease in ABCB1, ABCC2, and ABCG1 expression. The up-regulation of these genes during NAC was related to a significant decrease (up to 50-55%) in metastasis-free survival (Kaplan-Meier analysis: log-rank p value = 0.006-0.03). The association of changing the expression vector of MDR genes with metastasis-free survival did not depend on tumor size, lymph node involvement, histological form, receptor status, molecular subtype, and others clinicopathological parameters of breast cancer. The obtained data suggest that changing the expression vector of MDR genes in breast tumors during NAC may be used as a new potential prognostic marker of breast cancer. An increase in tumor expression of ABCB1, ABCC2, and ABCG1 during chemotherapy is a factor of poor prognosis, whereas down-regulation of these genes--a favorable prognostic marker.

Cell migration plays a crucial role in embryonic development, wound healing, regeneration, inflammation, and immune response, as well as in dissemination of malignant tumors. Vimentin is the marker of migrating cells, but its role in cell migration is still unclear. However, recent studies have revealed novel functions for vimentin related to the migration, such as determination of cellular polarity, regulation of cell contact formation, and arrangement and transport of signal proteins involved in cell motility. The review sums up the latest data on vimentin functions and its involvement in molecular mechanisms underlying cell migration. Early studies demonstrated that vimentin expression during embryonic development is associated with cell migration. However, having obtained vimentin knockout mice without apparent impairments in development and ability to reproduce, doubts have appeared ifvimentin is required for cell migration during embryonic development. In the present review, we also discuss involvement of vimentin in migration processes at different stages of development and try to resolve current contradictions concerning the role of vimentin in various events of cell migration.

The growth features of Walker 256 carcinosarcoma in rats of different genotypes were investigated. The experiments has been carried out on rats of the inbred Brattleboro and WAG lines, as well as on their hybrids segregated during congenic translocation of the normal vasopressin gene to the genotype of the Brattleboro rats. Brattleboro rats do not express the vasopressin gene. It has been found that there are only two types of tumor growth dynamics. In rats of the inbred Brattleboro line and in homozygotes di/di, that were segregated by backcrossings of heterozygous offsprings from the original crossbreeding between (WAG x Brattleboro) F1 x Brattleboro and the individuals with parental Brattleboro genotype, having grown to some extent the tumor regresses and disappears. In hybrid heterozygous siblings of di/+ genotype tumor grows linearly with time and always leads to fatal outcome. It has been found that, in the congenic procedure, the tumor regression trait is stably maintained and persistently inherited in lineage concordantly with the di/di genotype and, in rats with at least one allele of a normally expressed vasopressin gene, continuous and lethal tumor growth is always observed.

85 females were studied, 35 females had new onset of diabetes (DM2) and in 50 women DM2 was associated with recently diagnosed cancer (C+DM2). Group C+DM2 was characterized by higher levels ofbody mass index, insulinemia, estradiolemia, interleukin 6 in serum, and glyoxalase I activity in mononuclears. At the same time patients in C+DM2 group who had familial predisposition to DM2 were characterized by lower body mass index, body fat content, waist circumference, insulinemia, serum interleukin 6, viscosity of erythrocyte membranes and percent of comets in mononuclears in comparison with patients without familial predisposition to DM2. These trends were mostly opposite to the data of subgroups comparison (with or without relatives with DM2) in females with DM2 without cancer. The conclusion is made that the hereditary load with DM2 is differently realized in diabetics with higher or lower predisprosition to cancer that deserves further study.

All-trans-retinoic acid (ATRA) is the main biologically active metabolite of retinol (vitamin A) that is required for the regulation of such processes as embryogenesis, tissue differentiation, proliferation, and others. Multiple alcohol, retinol and retinaldehyde dehydrogenases (ADHs, RDHs and RALDHs) as well as aldo-keto reductases (AKRs) catalyze the biosynthesis of retinoic acid in humans. For many normal and neoplastic tissues, the key ATRA-synthesizing enzymes remain unknown. We identified ATRA-generating genes that are expressed in normal and malignant gastric tissues using the transcriptomic database analysis. Quantitative changes in the expression levels of these genes in gastric cancer were determined by semi-quantitative RT-PCR and real-time PCR. Significant decreases in the mRNA levels of genes encoding enzymes that catalyze the reversible oxidation/reduction of retinol and retinaldehyde (ADH4, ADH1B, ADH1C, RDHL, AKR1B10, AKR1B1, and RDH12), as well as the oxidation of retinaldehyde (RALDH1) were revealed in most of the tumor samples. The sharp reduction in the expression levels of genes encoding the key enzymes that convert retinol and retinaldehyde to retinoic acid could lead to a significant decrease in the content of ATRA--the transcriptional regulator of many genes, which in turn can lead to a dysregulation of cell proliferation/differentiation and initiate cancer development.

For the first time in a comparative perspective the epigenetic status of the benign proliferative processes, breast cancer, and metastases to regional lymph nodes was studied using DNA methylation microarray "GoldenGate Cancer Panel I" ("Illumina", USA). The functional groups of differentially methylated genes were identified in each set of samples. The genes that regulate cell proliferation and mobility were methylated in samples with benign proliferative processes. An aberrant methylation of the genes responsible for cell differentiation and proliferation, as well as protein phosphorylation and cell mobility was observed in the samples with malignant phenotype. Differential methylation of the genes that regulate cell adhesion, the formation of anatomical structures, angiogenesis, immune response, signal transduction, and protein phosphorylation was found in the samples with metastases to regional lymph nodes in comparison with the morphologically unaltered breast epithelium. The tissues from the benign proliferative processes and metastases to regional lymph nodes were generally characterized by a relatively lower level of epigenetic variability in comparison with the tissues of the primary tumor.