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The EGFR mutation is one of the most common mutations in malignant neoplasms. The epidermal growth factor receptor (EGFR) is a growth factor receptor that induces cell differentiation and proliferation when activated by binding one of its ligands. The receptor is located on the cell surface, where ligand binding activates a tyrosine kinase in the intracellular region of the receptor. The tyrosine kinase phosphorylates a number of intracellular substrates and further activates pathways leading to cell growth, DNA synthesis and oncogene expression. Gene amplification is a process characterized by an increase in the copy number of a restricted region in the chromosome shoulder, which is associated with overexpression of the corresponding amplified gene. Amplification of the EGFR gene is detected in about 40% of glioblastoma cases. It should be noted that EGFR gene amplification is accompanied by the acquisition of many mutations, which include intragenic deletions and point mutations. The most common EGFR mutation in glioblastomas of the brain is a deletion in exon 2-7 (EGFRvIII) frame, which occurs in 50% of all cases of EGFR-amplified glioblastoma. Despite great advances in molecular biology and targeted therapies, patients with non-small cell lung cancer (NSCLC) and glioblastoma still lead in mortality. Most of them have “classical” EGFR mutations (deletions in exon 19 and 21), but 15-20% of patients have rare mutations, which most often include point mutations, deletions and insertions in exon 18 and 25. Thus, rare EGFR mutations are a promising diagnostic and therapeutic target in cancer. This review summarizes data on the role of EGFR in the carcinogenesis of NMPL and glioblastoma. The literature search was performed using the Pubmed database.

Aim. The work was designed to study the physiological ‘cost’ of purposeful behavior on the model of endosurgical training. Materials and Methods. The research was implemented on 87 men of 18-24 years of age. The volunteers per formed a number of exercises 30 minutes each according to the Basic Endosurgical Simulation Training and Attestation System (BESTA system) on a T5 Large RM box-trainer within 10 consecutive days. The total time and the number of mistakes were recorded. During the training sessions an electromyogram was recorded on a BIOPAC MP 36 device. ECG was recorded and processed using a Varicard 2.51 device before and after the training sessions. ECG was analyzed by evaluation of the average differences of spectral analysis of heart rate variability before and after training. Results. It was shown that high-performance individuals were characterized by less energy spent on motor work in purposeful activity. Irrespective of the effectiveness of training, the purposeful behavior in conditions of psychoemotional stress was characterized by depletion of functional reserves of an organism. Low-performance subjects demonstrated a more evident weakening of parasympathetic (start of observations) and of sympathetic influences (end of observations) on the functional activity of the heart. Conclusion. Specific features of physiological ‘cost’ of purposeful behavior in individuals with different effectiveness of the activity were revealed on the model of endosurgical training. Better results in the dynamics of purposeful activity were achieved on this model at a higher physiological ‘cost’.

INTRODUCTION: Lung cancer is the most common malignant neoplasm. Despite advances in target therapy, immunotherapy, and chemotherapy, non-small cell lung cancer remains the major cause of cancer-related death worldwide. Tumor development is a complex process that depends on the influence of environmental factors and genetic predisposition. Although oncogenic factors have received much attention, the main mechanisms for oncogenesis are still poorly understood. Thus, studying the oncogenic mechanisms, including those with the involvement of microribonucleic acid (microRNA), is important for the diagnostics and treatment of malignant neoplasms. MicroRNA (miRNA) belong to the class of small non-coding ribonucleic acids that are involved in various cellular biological processes, including epithelialmesenchymal transition, apoptosis, proliferation, invasion, and metastatic dissemination of cancer cells. Recent publications show that the course of the oncological disease can be predicted by evaluating the expressions of some miRNAs. Therefore, miRNAs serve as promising diagnostic and therapeutic targets in oncological diseases. CONCLUSION: This review summarizes data on the role in carcinogenesis and prognostic significance of several miRNA (i.e., miRNA-128, -4500, -222, -224, -124, -125b, -127, -129-2, -137, and -375) in non-small cell lung cancer.