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The prevalence of breast cancer currently ranks first among Chinese women with malignant tumors, occurring during premenopausal childbearing age in more than 60% of patients. With the increasing age of women at childbirth, the wide application of assisted reproductive technology (ART) and the rejuvenation of tumor patients, the prevalence of breast cancer occurring during pregnancy (PrBC) is gradually increasing. There are many domestic and foreign expert consensus articles and guidelines on fertility preservation for children and patients of childbearing age with malignant tumors, but there is a lack of expert consensus or guidelines on fertility preservation for patients with PrBC. Considering the uniqueness of PrBC patients, there is an urgent need for a standardized suggestion regarding their fertility preservation. The Committee of Fertility Protection and Preservation of China Association for the Promotion of Health Science and Technology together with the Chinese Society of Gynecological Endocrinology affiliated with the International Society of Gynecological Endocrinology (CSGE-ISGE) organized relevant experts from different disciplines to formulate this consensus to guide fertility preservation of PrBC patients.