Ten-year survival of women with invasive breast cancer by stage, molecular subtype, and grade combined: a population-based study

Vollständiger Abstract

Worum geht es in dieser Arbeit?

Abstract Background Stage at diagnosis, histologic grade, and molecular subtypes are established prognostic indicators for women with breast cancer (BC), but their impact on population-based survival estimates is poorly documented. This study assessed long-term BC survival trends according to these factors. Methods We identified women aged <75 years diagnosed with stage I-IV invasive BC between 2004 and 2014 from the Friuli Venezia Giulia (North Eastern Italy) Cancer Registry (N = 10,476). Follow-up through 2023 was used to estimate overall and net survival (NS) according to combinations of prognostic factors. Results The highest 10-year NS (10-NS) was observed in women with stage I HR+/HER2− subtype (98.8%), while it was 35.1% for stage III triple-negative (TN) subtype. Among women with stage IV BC, 10-NS was 18.9% for those HR-/HER2+, 11.5% for those HR+/HER2+, 8.3% for HR+/HER2-, and 6.7% for TN. For each stage, NS decreased with increasing grade. Comparing period of diagnosis (2004-2009 vs 2010-2014), 10-NS remained >90% for women with stage I BC, but improved for stage III and aggressive subtypes (HR-/HER2+ and TN). In women with stage III HR-/HER2+ BC, 10-NS increased from 48.6% to 87.9% (+39 percentage points), while when diagnosis was stage III TN BC it rose from 28.8% to 42.3% Conclusion Population-based estimates of long-term BC survival by combined stage, grade, and molecular subtype can inform the interpretation of evolving therapeutic strategies and improve risk stratification for patient follow-up.