nan
Predictive, Diagnostic evidence:
Predictive: The study discusses FGFR1 amplification (FGFR1amp) as being associated with resistance to endocrine therapy and CDK4/6 inhibitors, indicating that the variant correlates with treatment response. Additionally, it mentions that high FGFR1-4 mRNA levels are associated with FGFRi response, further supporting its predictive nature regarding therapy outcomes.
Diagnostic: FGFR1 amplification is described as recurrent in metastatic breast cancer (MBC) and is used to identify responders to FGFR inhibitors and multi-tyrosine kinase inhibitors, indicating its role in classifying and defining a specific subtype of breast cancer. This association with a specific disease context supports its classification as a diagnostic evidence type.