Impact of age at diagnosis of metastatic breast cancer on overall survival in the real-life ESME metastatic breast cancer cohort

Abstract Background Young age is a poor prognostic factor in early stage breast cancer (BC) but its value is less established in metastatic BC (MBC). We evaluated the impact of age at MBC diagnosis on overall survival (OS) across three age groups ( 60 years(y)). Methods ESME MBC database is a national cohort, collecting retrospective data from 18 participating French cancer centers between 01/01/2008 and 12/31/2014. Results Among 14 403 women included, 1077 (7.5%), 6436 (44.7%) and 6890 (47.8%) pts were 60 y respectively. Pts 60y) and triple negative subtypes (27.4 vs 14.6% in >60y), and more frequent visceral involvement (36.3 vs 29.8% in >60y). At a median follow-up of 48 months, median OS differed across age groups: 38.8, 38.4 and 35.6 months for pts 60y, respectively (p 60y, respectively (p Conclusion Although young age seems associated with more aggressive presentations at diagnosis of MBC, it has no deleterious effect on OS in this large series.