Although it did not reach statistical significance, PD-L1-positive triple-negative breast cancers were more commonly associated with lymph node metastases (Chi-square = 5.355, df = 1, p = 0.021; Fisher’s exact test p = 0.031, Effect size phi = 0.3, Observed power = 0.081). This evidence concerns the gene CD274 and triple-negative breast carcinoma.