To examine the association between TREM1 expression and patient prognosis, we utilized a multi-institutional data set (Meta-Cohort 1 (MC1)) consisting of 1,954 breast tumor expression profiles characterized on the Affymetrix U133 platform and annotated for distant metastasis-free survival, molecular subtype, and other clinical and demographic features (8, 45). Here, TREM1 is linked to breast neoplasm.