There was higher expression of IL6 [16], MCP1 [16], BCL2 [9], luminal cytokeratins [9, 20, 21], MUC1 [17], BRCA1 [17], BRCA2 [17], CEA [19] and CA 15-3 [19] in older women with primary breast cancer compared to younger women. Here, CEACAM5 is linked to breast cancer.