This article presents the data of multi-year research on the problem of ovarian reserve preservation in cancer patients. The review includes 64 literary sources. The review provides the main methods for ovarian function preservation during the treatment of malignant diseases in patients of reproductive age. Given the increasing number of cancer patients in the group of patients of reproductive age, modern medicine is faced with the task not only to provide effective anticancer treatment, but also to try to preserve ovarian function in order to maintain hormonal levels and fertility. Unfortunately, most cancer treatment methods inhibit ovarian function. Thanks to modern approaches, there are medicinal methods for protecting against ovarian inhibition, which allows to maintain hormonal function and come back to solve reproductive problems after recovering from cancer.

The intestinal microbiota modulates immune programming and can prevent the realization of an allergic phenotype. For the formation of a normal microbiocenosis of the intestine, skin and oral cavity, a sufficient quantitative and qualitative bacterial colonization of the newborn is necessary during the transition from a sterile intrauterine environment to microbial colonization, resulting in the appearance of more than 1014 microorganisms. Low levels of bifidobacteria and early colonization of potentially pathogenic bacteria are associated with the development of severe allergic reactions. Prescribing probiotics containing Lactobacillus rhamnosus GG (LGG) at a concentration of 1081010 CFU from 36 weeks of gestation and during the first 34 months of lactation is associated with a 21% reduction in the risk of allergic reactions in the child.