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Background: Internal jugular vein (IJV) and axillary vein/subclavian vein (AxV/SCV) are commonly used for implantable venous access port (IVAP) implantation in breast cancer (BC) patients with chemotherapy. Previous studies focused on complications between these different approaches and ignored patient comfort. In this study, we aim to compare patient comfort between IJV and AxV/SCV approaches, as well as surgery duration and complications., Methods: This is a single-center prospective randomized controlled clinical trial. A total of 200 patients diagnosed with invasive BC will be enrolled in this study. After signing written informed consent, patients schedule to undergo IVAP implantation will be randomized at a 1:1 ratio to receive central venous catheters (CVC) with either IJV or AxV/SCV approaches. Baseline as well as demographic data and procedure time of port implantation will be recorded. All patients will receive assessment of comfort with a comfort scale table at days 1, 2 and 7 after implantation surgery. Patients will be followed up and complications will be recorded until devices are removed at the end of the treatment period, or in case of complications. Patient comfort, procedure time of implantation and complications will be compared and analyzed between these two arms., Discussion: To the best of our knowledge, this is the first study to compare patient comfort as primary outcome measure between IJV and AxV/SCV puncture. This study will further confirm the benefits of ultrasound guidance and may provide a better choice of IVAP implantation for BC patients., Trial Registration: This study has been registered at Chinese Clinical Trial Registry (ChiCTR, www. chictr.org.cn) and Chinese Ethics Committee of Registering Clinical Trials (No. ChiCTR2000034986).