Study to Compare the Safety of Immediate One-stage IBBR With Expander-Implant Two-stage IBBR Augmented With TiLoop® Bra(COSTA)

Studies comparing two‐stage implant‐based breast reconstruction with immediate one‐stage implant‐based breast reconstruction have inconsistent results and investigators find that there is a lack of high quality evidence focusing on comparing one‐stage and two‐stage implant‐based breast reconstruction with TiLoop®Bra. This study is the first prospective randomized study assessing the safety and patient‐reported outcomes of immediate one‐stage IBBR compared with those of two‐stage IBBR with TiLoop® Bra in breast cancer patients. The hypothesis is that one step method is not inferior to two step method in implant based breast reconstruction following skin‐sparing and/or Nipple‐sparing mastectomy using TiLoop® Bra. The current study is a randomized multicenter, open labeled, prospective, controlled study. Participants were enrolled at six hospitals in different places of China. All participants will undergo Skin Sparing Mastectomy(SSM)/Nipple Sparing Mastectomy(NSM) with one‐stage or two stage IBBR with TiLoop® Bra. Based on earlier experience, investigators calculated that the surgical complication rate was approximately 30 percent in the one‐stage group and 25 percent in the two‐stage group. Consider a dropout rate of 5%, a total of 450 patients, with 225 in each group, are needed.