CD4 and breast carcinoma: To address the relation between cGAS-STING signaling and immune cell infiltration, and also to address whether the observed cGAS-STING scores in bulk tumor sample analysis reflected tumor cells or infiltrated lymphocytes, we immunohistochemically analyzed the immune cell markers CD4 (T cell subset), CD20 (B cell marker), and CD57 (NK cell marker) in our breast cancer cohort (Fig. 5a).