A Study on the Treatment of Early Small Breast Cancer With Ultrasound-guided Vacuum-assisted Excision Combined With Surgery

The aim of this clinical trial is to assess the feasibility and safety of ultrasound-guided vacuum-assisted excision (VAE) in the treatment of early breast cancer with Tis (carcinoma in situ) or T1 (maximum tumor diameter ≤2cm) and negative axillary lymph nodes on imaging. The main question it aims to answer is: * After VAE, when undergoing routine breast cancer surgery again, what is the complete resection rate of the lesion in the surgically removed tissue (pathologically confirmed), that is, the false negative rate of VAE? * Which type of breast cancer lesion has the highest complete resection rate? * Is it clear whether VAE can be applied in the treatment of early breast cancer with Tis or T1 and negative axillary lymph nodes on imaging? * Do patients with benign breast nodules who undergo VAE or are recommended for Vacuum-assisted breast biopsy (VABB) due to limited puncture and are diagnosed with breast cancer need to undergo surgery again? * The incidence of complications of VAE. Participants will: * Single early breast cancer subjects with Tis or T1 and negative axillary lymph nodes on imaging, after being fully informed and signing the informed consent form, enter the trial period after screening and being qualified. * After the subjects are confirmed to be enrolled, VAE biopsy resection is performed first. * Patients clearly diagnosed with breast cancer receive traditional radical mastectomy for breast cancer: Breast-conserving surgery or total mastectomy, sentinel lymph node biopsy or dissection in the axilla, assessment of whether the lesion has been completely removed based on postoperative pathology, and follow-up is conducted.