RT Journal Article T1 Magnetic resonance imaging before breast cancer surgery: results of an observational multicenter international prospective analysis (MIPA). A1 Sardanelli, Francesco A1 Trimboli, Rubina M A1 Houssami, Nehmat A1 Gilbert, Fiona J A1 Helbich, Thomas H A1 Álvarez Benito, Marina A1 Balleyguier, Corinne A1 Bazzocchi, Massimo A1 Bult, Peter A1 Calabrese, Massimo A1 Camps Herrero, Julia A1 Cartia, Francesco A1 Cassano, Enrico A1 Clauser, Paola A1 Cozzi, Andrea A1 de Andrade, Danúbia A A1 de Lima Docema, Marcos F A1 Depretto, Catherine A1 Dominelli, Valeria A1 Forrai, Gábor A1 Girometti, Rossano A1 Harms, Steven E A1 Hilborne, Sarah A1 Ienzi, Raffaele A1 Lobbes, Marc B I A1 Losio, Claudio A1 Mann, Ritse M A1 Montemezzi, Stefania A1 Obdeijn, Inge-Marie A1 Ozcan, Umit A A1 Pediconi, Federica A1 Pinker, Katja A1 Preibsch, Heike A1 Raya Povedano, José L A1 Sacchetto, Daniela A1 Scaperrotta, Gianfranco P A1 Schiaffino, Simone A1 Schlooz, Margrethe A1 Szabó, Botond K A1 Taylor, Donna B A1 Ulus, Özden S A1 Van Goethem, Mireille A1 Veltman, Jeroen A1 Weigel, Stefanie A1 Wenkel, Evelyn A1 Zuiani, Chiara A1 Di Leo, Giovanni K1 Breast cancer K1 Breast-conserving surgery K1 Magnetic resonance imaging K1 Mastectomy K1 Reoperation AB Preoperative breast magnetic resonance imaging (MRI) can inform surgical planning but might cause overtreatment by increasing the mastectomy rate. The Multicenter International Prospective Analysis (MIPA) study investigated this controversial issue. This observational study enrolled women aged 18-80 years with biopsy-proven breast cancer, who underwent MRI in addition to conventional imaging (mammography and/or breast ultrasonography) or conventional imaging alone before surgery as routine practice at 27 centers. Exclusion criteria included planned neoadjuvant therapy, pregnancy, personal history of any cancer, and distant metastases. Of 5896 analyzed patients, 2763 (46.9%) had conventional imaging only (noMRI group), and 3133 (53.1%) underwent MRI that was performed for diagnosis, screening, or unknown purposes in 692/3133 women (22.1%), with preoperative intent in 2441/3133 women (77.9%, MRI group). Patients in the MRI group were younger, had denser breasts, more cancers ≥ 20 mm, and a higher rate of invasive lobular histology than patients who underwent conventional imaging alone (p  Clinicians requested breast MRI for women with a higher a priori probability of receiving mastectomy. MRI was associated with 11.3% more mastectomies, and with 3.2% fewer reoperations in the breast conservation subgroup. • In 19% of patients of the MIPA study, breast MRI was performed for screening or diagnostic purposes. • The current patient selection to preoperative breast MRI implies an 11% increase in mastectomies, counterbalanced by a 3% reduction of the reoperation rate. • Data from the MIPA study can support discussion in tumor boards when preoperative MRI is under consideration and should be shared with patients to achieve informed decision-making. YR 2021 FD 2021-10-13 LK http://hdl.handle.net/10668/19797 UL http://hdl.handle.net/10668/19797 LA en DS RISalud RD Apr 5, 2025