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Copyright of Paediatrics & Family Medicine / Pediatria i Medycyna Rodzinna is the property of Medical Communications Sp. z o.o. and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Genetic, endocrine and immunological disorders, anatomical defects in the reproductive tract, certain chronic diseases, toxic substances, or advanced age of the mother are most cited among the main causes of pregnancy loss at various stages. However, the cause of miscarriage or preterm labor in some cases remains unclear. Determination of the etiology about these clinical conditions may reduce the rate of reproductive failure. Similarly, the etiology of other obstetric disorders, such as preeclampsia or postpartum hemorrhage, has not been fully explained. One of the postulated and still under-researched causes of these disorders may be dysbiosis within the reproductive tract. A disturbed microbial balance is not always associated with the presence of an acute infection with clear clinical symptoms. Dysbiosis in conjunction with other pathophysiological factors may increase the risk of the mentioned clinical conditions. The aim of this paper is to show the information indicating the existence of a correlation between dysbiosis and an increase in the risk of obstetric disorders. Further analysis is also required to clarify the mechanism of the effect of dysbiosis on the disruption of metabolic and biochemical processes within the reproductive system during pregnancy.

Introduction and purpose. Preserving fertility is crucial for cancer patients, aligning with advancements in oncology. As survival rates improve, addressing treatment-related late effects gains importance. Many young patients, aware of therapy toxicity, consider future conception chances, impacting treatment decisions. With a trend toward delayed childbirth and a growing population facing unplanned family planning disruptions, the demand for fertility preservation is expected to rise. This paper provides a brief review of available methods for preserving fertility in cancer patients. State of knowledge. Freezing semen in liquid nitrogen vapor is a standard method for preserving reproductive potential in male cancer patients. Shielding during total-body radiation limits testicular volume reduction, indicating less damage to the germinal epithelium. Hormone suppression treatments are not protective in male cancer patients. Oocyte and embryo cryopreservation are considered secure methods before anticancer treatments, with oocyte cryopreservation being preferred for post-pubertal women. Ovarian tissue cryopreservation remains an alternative method without preliminary treatment, suitable when time is insufficient for ovarian stimulation. Ovarian transposition beyond the intended radiation area, performed laparoscopically, can retain ovarian function. GnRH agonist administration before and during chemotherapy aims to minimize the likelihood of premature ovarian insufficiency. Summary. Advancements in fertility preservation for cancer patients, ranging from traditional cryopreservation to innovative methods like ovarian tissue preservation, highlight a commitment to empowering individuals facing cancer diagnoses. Ongoing research expands possibilities, ensuring a diverse range of strategies that offer tangible and hopeful prospects at the intersection of cancer and reproductive health.