Ojala 2017.

Study characteristics
Methods	Retrospective multi‐centre cohort Helsinki and Uusimaa Hospital District, Finland 2010 379 participants
Participants	Inclusion: Patients with invasive breast cancer undergoing breast‐conserving surgery Exclusion: Bilateral disease or previous breast cancer
Interventions	Intervention: Volume displacement, (n = 86): Racket mammoplasty (22%) Reduction mammoplasty techniques (22%) Round block (19%) Rotation plasty techniques (19%) Extensive dual plane undermining (14%) Other oncoplastic techniques (5%) Control: Standard BCS, (n = 293)
Outcomes	Primaryoutcomes: No outcomes of interest Secondaryoutcomes: Re‐excisions Complications PROMs (Breast cancer treatment outcome scale (BCTOS)/self‐designed)
Notes	No disclosures declared Funding: Kurt and Doris Palander Foundation Grant