Clinical trial NCT04049305: Robotic Versus Conventional or Endoscopic Nipple Sparing Mastectomy for Breast Cancer
Official title: Robotic Versus Conventional or Endoscopic Nipple Sparing Mastectomy in the Management of Breast Cancer- A Retrospective Study With Multi-center Pooled Data Analysis
Study type: INTERVENTIONAL
Overall status: UNKNOWN
Phase: NA
Conditions: Breast Cancer Female
Keywords: nipple sparing mastectomy
robotic nipple sparing mastectomy (R-NSM)
conventional nipple sparing mastectomy (C-NSM)
endoscopic assisted nipple sparing mastectomy (E-NSM)
immediate breast reconstruction
immediate prothesis breast reconstruction
Lead sponsor: Changhua Christian Hospital
Sponsor class: OTHER
Collaborators: name: Ministry of Science and Technology, Taiwan
name: Intuitive Surgical
First posted: 2019-08-08
Enrollment: 900
Sex: FEMALE
Minimum age (years): 20
Maximum age (years): 80
Standard ages: ADULT
OLDER_ADULT
Accepts healthy volunteers: no
Allocation: NON_RANDOMIZED
Intervention model: PARALLEL
Intervention model description: Retrospective, multi-centers pooled data analysis of R-NSM versus C-NSM or E-NSM in the management of breast cancer.

3 arms study for comparisons
Primary purpose: TREATMENT

Brief summary: This study will retrospectively collect and evaluate the surgical outcomes of robotic nipple sparing mastectomy (R-NSM) compared with endoscopic assisted NSM (E-NSM) or conventional NSM (C-NSM) in the management of breast cancer. Multi-centers pooled data analysis would be performed for comparisons of R-NSM compared with C-NSM or E-NSM.

Detailed description: Nipple-sparing mastectomy (NSM), which preserved the nipple areolar complex (NAC) and skin flap during mastectomy, was increasingly performed in breast cancer patients due to better cosmetic outcome, higher patient satisfaction, and maintained oncologic safety. Minimal invasive surgery had become the main stream of operations, and new surgical innovations of NSM, like endoscopic nipple sparing mastectomy (E-NSM) or robotic nipple sparing mastectomy (R-NSM), were emerging and applied in the surgical treatment of breast cancer. E-NSM, which is performed through small axillary and/or peri-areolar incisions, was reported to be associated with small inconspicuous incision and good cosmetic outcome. Conventional E-NSM was performed with two separate incisions over axilla and peri-areolar regions. E-NSM with areolar incision, just like NSM with areolar related incision (NAC ischemia/necrosis rate: range 7%-81.8%), was associated with increased NAC ischemia/necrosis (reported ranged: 9.1-19%). New technique modifications of E-NSM were emerging focusing on single axillary incision NSM, which spare the peri-areolar incision and thereby decrease the compromise of bloody supply from mastectomy skin flap, was reported to have low NAC necrosis rate (0%). However, the 2-dimensional endoscopic in-line camera produces an inconsistent optical window around the curvature of the breast skin flap, and the internal mobility was limited and the dissection angles were inadequate with traditional endoscopic rigid tips instruments through single access. Due to the limitations of endoscopy instruments and technique difficulty, neither conventional E-NSM nor single access E-NSM was widespread used in breast cancer R-NSM, which introduce da Vinci surgical platform through a small extramammary axillary or lateral chest wound to perform NSM, had been applied in the surgical treatment of early breast cancer or risk reducing mastectomy. R-NSM, which incorporated 3- dimensional (3D) imaging system and flexibility of robotic arm and instruments, was reported to have the potential to overcome the technique difficulty of E-NSM. The preliminary results of R-NSM from current literature reported series and ours were safe, and associated with good cosmetic outcome and high patients' satisfaction. However, evidence comparing R-NSM to conventional NSM (CNSM) or E-NSM was lacking. In this study, the authors aim to investigate and analyze the clinical and aesthetic outcomes as well as the cost effectiveness of R-NSM through a longitudinal cohort study design whereby a retrospective review will be carried out for patients undergoing R-NSM, E-NSM or C-NSM. Multi-centers pooled data analysis would be performed for comparisons of R-NSM compared with C-NSM or E-NSM.

Eligibility criteria: Inclusion Criteria:

* A. Indications and selection criteria for nipple sparing mastectomy (NSM) in general and conventional nipple sparing mastectomy (C-NSM).

  * NSM will be offered to patients who are suitable for mastectomy but keen to conserve nipple areolar complex (NAC), with or without reconstruction. Patients must not have clinical or radiological involvement of the NAC. Patients with nipple involvement proven via intra-operative frozen section analysis will receive NAC excision and hence a skin-sparing mastectomy (SSM) performed instead. B. Indications and selection criteria for robotic nipple sparing mastectomy (R-NSM) or endoscopic nipple sparing mastectomy (E-NSM)
  * The general inclusion criteria or pre-requisite for nipple sparing mastectomy apply to R-NSM or E-NSM as well.
  * In addition, R-NSM or E-NSM should only include early stage breast cancer (carcinoma in situ, stage I - III A), a tumor size less than 5 cm, no evidence of multiple lymph node metastasis, and no evidence of nipple, skin or chest wall invasion.

Exclusion Criteria:

* Contraindications for R-NSM, C-NSM or E-NSM include those with apparent NAC involvement, inflammatory breast cancer, breast cancer with chest wall or skin invasion, locally advanced breast cancer, breast cancer with extensive axillary lymph node metastasis (stage III B or later), and patients with severe co-morbid conditions, such as heart disease, renal failure, liver dysfunction, and poor performance status as assessed by the primary physicians.

  * Relative contraindications include women with large (breast cup size larger than E or breast mastectomy weight \>600gm) or ptotic breast as the aesthetic outcomes may be sub-optimal.

Primary outcomes:
measure: Operation time
timeFrame: immediate post operation
measure: Wound healing status
timeFrame: within one month (30 days) post operation
measure: Skin blister formation
timeFrame: within one month (30 days) post operation
measure: Skin flap ischemia/necrosis rate
timeFrame: within one month (30 days) post operation
measure: Implant loss rate
timeFrame: within one month (30 days) post operation
measure: Post operation Bleeding/hematoma rate
timeFrame: within one month (30 days) post operation
measure: Post operation Bleeding/hematoma rate
timeFrame: within one month (30 days) post operation
measure: Seroma formation rate
timeFrame: within one month (30 days) post operation
measure: Grade of Nipple areolar complex ischemia/necrosis
timeFrame: evaluated in post operative 2 weeks to 3 months post operation
measure: Rate of Surgical margin involvement in specimen pathologic examination
timeFrame: post operative 2 weeks after pathologic report available
measure: Aesthetic outcome evaluation-Patient reported cosmetic outcome results
timeFrame: 1-3 months after the operation when the wound was healed
measure: Blood loss during operation
timeFrame: immediate post operation
measure: Hospital stay
timeFrame: within 2 weeks of operation
measure: Mean mastectomy weight
timeFrame: immediate post operation
measure: Reconstruction implant volume
timeFrame: immediate post operation
Secondary outcomes:
measure: Cost- analysis of C-NSM versus R-NSM or E-NSM
timeFrame: post operation one month
measure: Disease free Survival
timeFrame: 5 years post operation
measure: Overall survival
timeFrame: 5 years post operation
Other outcomes:
Locations:
city: Milan
country: Italy
facility: European Institute of Oncology
city: Seoul
country: Korea, Republic of
facility: Severance Hospital
city: Changhua
country: Taiwan
facility: Changhua Christian Hospital
city: Kaohsiung
country: Taiwan
facility: Kaohsiung Medical University Hospital
city: Taichung
country: Taiwan
facility: China Medical University Hospital
city: Tainan
country: Taiwan
facility: National Cheng Kung University Hospital
city: Taipei county
country: Taiwan
facility: Shuang-Ho Hospital - Taipei Medical University
city: Taipei
country: Taiwan
facility: National Taiwan University Hospital
city: Taipei
country: Taiwan
facility: Shin Kong Wu Ho-Su Memorial Hospital
city: Taipei
country: Taiwan
facility: Taipei Municipal Wan Fang Hospital
city: Taipei
country: Taiwan
facility: Taipei Veterans General Hospital
city: Taipei
country: Taiwan
facility: Tri-Service General Hospital
city: Taoyuan
country: Taiwan
facility: Chang Gung Memorial Hospital
Study officials:
affiliation: Changhua Christian Hospital
name: Hung-Wen Lai, MD, PhD
role: PRINCIPAL_INVESTIGATOR
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