Furthermore, mice bearing GFP-expressing 4T1 murine breast tumors were treated with FreeαPD1 & αPDL1 or imNAαPD1 & αPDL1, and tumor tissues were harvested, sectioned, and stained with anti-CD8 antibody for confocal laser scanning microscopy (CLSM). Here, CD8A is linked to breast neoplasm.