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In the modern world breastfeeding (BF) is considered as a significant factor in reducing the risk of developing malignant tumors of the mammary gland and ovaries. However, the problem of maintenance or refusing BF in malignant neoplasms (malignant neoplasms) still remains open. In recent years, there has been a steady increase in breast cancer (BC), especially in developed countries, with more than 10% of all breast malignancies (BC) diagnosed in women under 40 years of age. The presented article highlights aspects of maintaining lactation in different periods of the relevance of BF in relation to the timing of manifestation of cancer, and also presents data from the multicenter study POSITIVE (Pregnancy Outcome and Safety of Interrupting Therapy for women with endocrine responsIVE breast cancer) on the possibilities of implementing reproductive function and BF in women receiving therapy for hormone-receptor positive (HR+) BC stages I–III. BF with cancer detected in the postpartum period depends on the treatment of the underlying disease. In patients undergoing surgical treatment, BF is not contraindicated, but it is not always technically possible. During chemotherapy, BF is not recommended. When carrying out radiotherapy, it is possible to undergo BF using a healthy mammary gland. There is currently no evidence to suggest that BF woman diagnosed with cancer may have any negative effects. In general, it has been shown that preserving and maintaining lactation in women with a history of cancer is safe for both mother and child.

Aim. To study the clinical and anamnestic, and surgical features of patients with genitourinary system malformations. Materials and methods. A retrospective analysis of data from 252 medical records of patients with genitourinary system malformations who were admitted for examination and treatment to the Department of Pediatric and Adolescent Gynecology of the Kulakov National Medical Research Center for Obstetrics, Gynecology and Perinatology of the Ministry of Health of the Russian Federation from 2012 to 2019. During analysis, special attention was paid to the data of surgical treatment, clinical and anamnestic data and the intraoperative picture. Results. Developmental anomalies of the genital system are combined with urinary system malformations in 21.1% of cases. Genital malformations in adolescent girls are characterized by a high rate of various complications: hematocolpos (53.6), hematocervix (30%), hematometra (26.2%), hematosalpinx (15.1%), endometriosis (19.2%), masses (16.4%) and adhesions (25.4%). Conclusion. Genital system malformations are often associated with anomalies of the urinary system and are characterized by a high risk of complications, therefore, timely identification and multidisciplinary management of such patients from an early age is extremely important.

Objectives: Diabetic retinopathy remains the major cause of blindness among the working-age population of developed countries. Considering this, experimental models of diabetes involving laboratory animals are important for assessing clinically significant methods to determine early pathologic alterations of the retina. The early detection of diabetic retinopathy in combination with a search for new pathogenetic targets will enable focusing on new strategies to limit the development of critical changes in the retina and to prolong retinal functioning during the development of diabetes mellitus. Aim: This study aimed to define parameters of electroretinography test that identifies changes due to retinal impairment in diabetes. Methods: Experimental diabetes was induced in Wistar rats by intraperitoneally injecting streptozocin (65 mg/kg; group ‘DM’). The control group (‘CB’) received intraperitoneal injections of the vehicle, i.e. citric buffer. On each consecutive day of the experiment, all rats received insulin detemir (2 u/kg). Ophthalmoscopy and electroretinography were conducted before initiating the experiment and after 50, 58 and 66 days of injectin sptreptozocin. Results: Amid 2u\kg insulin injection the glucose level in venous blood in «DM» group amounted to 30-40 mM. The ophthalmoscopy showed that the optic nerve disk paled by the 50th day, with its line erasing. During electroretinography, wave amplitude in oscillatory potential test tended to decrease. β-wave latency of photopic system increased with α-wave latency of photopic system and α- and β-waves latency of scotopic system not altering. In addition, the amplitude of rhythmic stimulation of 8 and 12 Hz decreased. Conclusion: The most apparent parameters of electroretinography for modelling streptozocin-induced diabetes are wave amplitude during the oscillatory potential test, photopic B-wave latency and the amplitude of rhythmic stimulation. These results suggest that in diabetes, ischaemic injury is an important cause of early dysfunction of inner retinal layers.