Analysis of correlations between PDL1 mRNA expression and tumor features, showed that, in agreement with previous publications on smaller series [34, 35, 39], PDL1 upregulation was associated with poor-prognosis features: large tumor size, high grade, negative ER status, negative PR status, positive ERBB2 status, and high proliferation rate. The gene discussed is ERBB2; the disease is neoplasm.