Studies indicate that fibroblast activation protein alpha (FAP)+, fibroblast surface protein (FSP)+, alpha smooth muscle actin (αSMA)+, CD45− and CD11b− stromal cells within lung and breast tumours promote tumourigenesis, creating an immunosuppressive niche within the tumour microenvironment (TME).7, 8, 9. Here, PTPRC is linked to breast neoplasm.