Undifferentiated Uterine Sarcoma With SMARCA4 Gene Deletion: Report of Two Cases and Literature Review

Undifferentiated uterine sarcoma with SMARCA4 gene deletion is a rare malignant tumor.The incidence of this type of tumor is low,and fewer than 40 cases have been reported worldwide.Most of the cases are advanced at the time of diagnosis,and the tumor is aggressive and difficult to be diagnosed.The lack of large-sample studies,unclear treatment plan,and individualized treatment in most cases lead to poor prognosis and high mortality.We report two cases of undifferentiated uterine sarcoma at the ⅣB stage in young women with SMARCA4 gene deletion,providing reference for future treatment.