In a recent large meta-analysis, Matikas and coworkers showed that PD-L1 expression in tumor cells was associated with a shorter DFS and OS, whereas PD-L1 expression in immune cells was associated with a longer DFS (HR = 0.61, 95%CI (0.51–0.73), p < 0.001), and with a longer OS (HR = 0.53, 95%CI (0.39–0.73), p < 0.001) in the TNBC subgroup (8 studies, n = 969) [38]. Here, CD274 is linked to neoplasm.