The annual incidence rate of cancer is estimated to be more than 11,000 patients in the U.K. in the age group of 15-40 years, which corresponds to 4% of all cancer patients. The diagnosis of cancer is followed by devastating consequences for the patients and their families in this age group. Although the treatment of cancer is of crucial significance, it should also examine the impact of the disease on fertility at the time of the diagnosis and the damages caused from the surgical treatment, chemotherapy, or radiotherapy. The gynecological cancer, especially the diagnosis of ovarian cancer, the prevention, and treatment, as well as the fertility preservation in young women, represent the gold standard for all gynecologists. The crucial disadvantage remains the difficulty in primary diagnosis of ovarian cancer and the coexistence with pregnancy, focusing on the fertility preservation and maintaining pregnancy. In the absence of large perspective randomized trials and cohort studies, the therapeutic mapping and optimal management of these patients are difficult. In order to establish detailed guidelines, it is necessary to ensure surgical mapping depending on the cancer staging and the quality of life of the patients.