Purpose: To evaluate the clinical value of preserving the ascending branch of the uterine artery in improving the uterine blood supply after radical trachelectomy (RT). Method: This study will include 100 patients with early-stage cervical cancer, who undergo RT with the preservation of the ascending branch of the uterine artery, at Sun Yat-sen Memorial Hospital, Sun Yat-sen University. The investigators attribute the uterine artery occlusion to the inevitable injury of the remaining uterine arteries during the ligation of the descending branch of the uterine artery and continuous or intermittent suturing. Hence, the investigators will carefully skeletonize the three branches of the uterine artery, ligates the vaginal and cervical branches, and preserves the ascending branch of the uterine artery under direct vision. Furthermore, a new skill called the "cuff-sleeve" suture method is introduced to wrap the vagina around the stump cervix, wherein they are sutured using a 2-0 absorbable suture by placing two cross-stitches in the anterior and posterior wall, respectively, without piercing the cervical mucosa layer or damaging the uterine arteries. Study groups: The patients will be categorized into two groups. All patients in the postoperative group will undergo computed tomography angiography (CTA) to evaluate the status of the preserved ascending branch and the residual uterine blood supply pattern after surgery. Patients in the preoperative group will undergo CTA before RT to determine the uterine blood supply pattern in healthy individuals. Data collection: Data regarding individual patient characteristics, International Federation of Gynecology and Obstetrics (FIGO) stage, histologic subtype, lymphovascular space involvement (LVSI) status, recurrence, CTA data, fertility results, and obstetric outcomes will be collected for the patients in the postoperative group. The CTA findings of the preoperative group will be obtained. The CTA data are mainly analyzed to determine the arteries supplying the uterus. The investigators consider a vessel as a supplying artery only when it is continuous from its origin up to the entry into the uterus and then branches. The uterine blood supply in patients is divided into three patterns based on the supplying vessels. The first is the ovarian artery-supplying pattern, wherein the residual uterus is supplied only by the ovarian arteries. The second is the hybrid-supplying pattern, in which an ovarian artery or a newly formed artery supplied the residual uterus along with the contralateral uterine artery. The third is the uterine artery-supplying pattern, wherein the residual uterus is supplied only by the uterine arteries. Furthermore, the diameter of the visualized supplying vessels is recorded. The diameters of the uterine and newly formed arteries are measured 2 cm before they enter the corpus uteri. However, the ovarian artery diameter is measured at its origin from the aorta ventralis, beside the external iliac artery, and 2 cm before it enters the corpus uteri since the ovarian arteries are convoluted. Statistical methods: Statistical analyses were performed using IBM SPSS Statistics, version 26. The t-test is used for analyzing the continuous variables and the chi-squared test for categorical variables.