The Oncoplastic Breast Consortium (OPBC), founded in 2017 as an independent non-profit organization, aims to establish oncoplastic surgery in clinical practice worldwide. Under the leadership of Prof. Walter P. Weber, OPBC is supported by over 500 leading experts and an increasing number of patient representatives from a total of 75 countries. The consortium's first study deals with breast reconstruction after cancer surgery, which is most commonly performed with the help of implants.

Background
Many patients have to undergo amputation of one or both breasts for therapeutic or preventive reasons. The reconstruction of the removed breast can be done with the body's own tissue or with implants. In Switzerland alone, in 2017over 1500 breast reconstructions with implants (IBBR) have been performed. However, it is currently not known whether the positioning of the implant in front of (prepectoral) or behind (subpectoral) the pectoral muscle is better for the patients.

Objective
The study aims to determine which of the two surgical techniques will guarantee a better quality of life for patients in the long term. In addition, the two groups will be compared in terms of safety, contentment, aesthetics and burden on the patients.