In contrast, within the subgroup of triple-negative breast cancers, LAG-3 was shown to be a significant prognostic factor regarding RFS (p = 0.01, n = 335) and OS (p = 0.037, n = 132): a higher LAG-3 expression was associated with a better outcome (Figure S7a,b). Here, LAG3 is linked to triple-negative breast carcinoma.