Modern protocols for treatment of malignant tumors of all localizations affect all spheres of life of patients significantly reducing their quality of life. Along with people suffering from malignant diseases and members of their immediate family, through professional engagement and optimal treatment plan that provides maximum benefit in improving disease outcome, oncologists may offer a better quality of life to a patient. Enabling parenting to persons treated for malignant diseases is one of the greatest challenges in modern medicine, and it is an inseparable part of the overall high quality of treatment of oncology patients. The possibility of preserving fertility of oncological patients is considered together with the primary goal of treatment: oncological safety regarding the outcome of malignant disease.