LAG3 and breast cancer: We therefore performed a meta-analysis to clarify the role of these cells in prognosis prediction for BC.<h4>Methods</h4>We searched PubMed, Embase, and EBSCO to identify the studies evaluating the association of LAG-3<sup>+</sup> lymphocyte infiltration and overall survival (OS) and/or disease-free survival (DFS) in BC patients, then combined extracted data with STATA 12.0.<h4>Results</h4>Eight published studies involving 5,859 BC patients were incorporated into this meta-analysis.