Robotic surgery, which incorporated 3-dimensional imaging system and flexibility of robotic arm and instruments, had been growingly used in different field of surgeries.1–4 Robotic nipple-sparing mastectomy (R-NSM), which introduce da Vinci surgical platform through a small axillary wound to perform NSM with (or without) immediate breast reconstruction (IBR), was reported to have potential to overcome the technique difficulty of endoscopic-assisted NSM and showed promising cosmetic outcome.5,6 In this study, we report the technique, and preliminary experience and clinical outcome of R-NSM and IBR with Gel implant.
After preoperative marking, the patient was placed in the supine position with operative arm abducted about 90 degrees. The operating side shoulder was elevated to 30 degree with draping (or the arm in operating field was adducted after axillary surgery) to prevent conflict between the operating table and docking of robotic surgery system (Fig. 1A). A physiological saline solution containing lidocaine 0.05% and epinephrine 1:1,000,000 was injected subcutaneously into the whole breast to minimize bleeding. Then an approximately 2.5–4 cm oblique axillary incision (depend on the size of the breast to be removed) was made over the extramammary region, and axillary lymph node surgery was performed if indicated.
ROBOTIC DOCKING AND DISSECTION
To create the working space for the placement of the single port (Glove Port, Nelis, Gyeonggi-do, Korea, Fig. 1B), the subcutaneous flap was dissected with electrocautery under direct vision in a 2.5–4 cm area. After port placement, carbon dioxide (CO2) was inflated with air pressure kept at 8 mm Hg to create space for mastectomy.5,7 Then robotic side cart (da Vinci, Intuitive Surgical, Sunnyvale, Calif.) is positioned posterior to the patient with the 2 robotic arms and the endoscope extending over the patient in proximity to the ports. In this position, the arms are aligned with the plane of the breast, nearly parallel to the floor (Fig. 1C), and the ports are docked to the robotic arms.
Then the operation was shifted to da Vinci Si (Intuitive Surgical, Sunnyvale, Calif.) robotic platform with operating surgeon controlled at the console. To prevent conflicts during dissection, the elbows of robotic arms were opened as much as possible. We use a 30-degree 12-mm-diameter camera (Intuitive Surgical, Denzlingen, Germany) in the upper port to prevent collisions of other instruments. Dissection was carried out with an 8 mm monopolar scissor (Intuitive Surgical, Sunnyvale, Calif.). Traction and counter-traction, along with maintaining exposure and stretching out the tissue was carried out with 8 mm prograsp forceps (Intuitive Surgical, Sunnyvale, Calif., Fig. 1B). The location of scissor and prograsp in right or left arm could be adjusted during operation if needed.
The dissection started from the superficial skin flaps in all quadrants. To facilitate skin flap dissection, tunneling technique was applied,8–10 and the septa between the skin flap and parenchyma were dissected using monopolar scissors. Then subnipple biopsy was performed by taking 2 separate specimens (inner and outer part) under the nipple areolar complex (NAC) and the intraoperative frozen section was analyzed.11 After completion of superficial skin flap dissection, the peripheral and posterior dissection was carried out by pulling breast tissue to create a sufficient working space. Posterior dissection was performed by detach breast tissue from pectoralis major muscle. After completion of the dissection, entire breast specimen was removed through the axillary wound. If cancer cell invasion was found in the subareolar area, the entire NAC was removed.
After mastectomy, subpectoral working space was developed under direct vision by electrocautery with assistance of handle light retractor. Then single port was reinserted and gas reinflated for robotic submuscular pocket dissection. The prograsp forceps was used to lift the pectoralis major muscle, and monopolar scissor was used to cut and dissect plane. After completion of submuscular dissection with da Vinci surgical platform, the robotic instruments and single port were removed. Then, the operating table was bent into sitting position. The adequacy of submuscular pocket dissection was checked, and further dissection of submuscular pocket was performed with light source retractor. After completion of the submuscular pocket dissection, the implant was inserted from the axillary access. Usually 2 drains (beneath skin flap and submuscular pocket) were left as displayed in Video 1 (seevideo, Supplemental Digital Content 1, which discusses details of robotic nipple-sparing mastectomy. This video is available in the “Related Videos” section of the Full-Text article at PRSGlobalOpen.com or at http://links.lww.com/PRSGO/A789).
From March to October 2017, 15 patients with breast cancer undergone R-NSM and IBR with Gel implant in our institute. The mean age of them was 46.5 ± 10.0 years. The pathologic stage was 30.8% DCIS, 30.8% stage I, 30.8% stage II, and 7.7% stage III. The mean operation time was 282.8 ± 70.4 minutes, and blood loss was 38.3 ± 45.3 ml. The mean hospital stay was 6.7 ± 1.2 days. The positive surgical margin rate was 0%. One patient suffered from delayed axillary wound healing. Two patients (13.3%) with transit nipple ischemia change, but no total NAC necrosis case was observed. No local recurrence, distant metastasis, or case mortality was found during mean 6.3 ± 2.1 months follow-up. According to the postoperative cosmetic outcome questionnaire evaluation, about 86.7% of patients graded as excellent, and 13.3% good. All patients were satisfied with the postoperative scar appearance, wound length, and wound position.
The air pressure derived from inflation of CO2 might be contributed to the reduction of bleeding, and secretion from tissue. Subcutaneous emphysema was observed as sequel after gas inflation, and usually subsided spontaneously. Robotic surgical platform with da Vinci system worked efficiently in performing subnipple biopsy. We could remove most breast glandular tissue near and beneath the NAC, and coring subnipple lactiferous ducts to minimize the risk of local recurrence. The extremity low rate of NAC and skin flap ischemia necrosis was promising. The 2 main limitations of R-NSM were the longer operation time and higher cost.1,5,6 In our initial cases, it did took longer operation time; however, after experience accumulated, the R-NSM could be decreased to within 90 minutes, and IBR with Gel implant could be completed 60 minutes after R-NSM.
From our preliminary experience, R-NSM and IBR with Gel implant is a safe procedure, with good cosmetic results, and could be a promising new technique for breast cancer patients indicated for mastectomy.
The authors thank Yun-Ting Chang and Shun-Ing Tsai for the assistance in this study.
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