Consequently, FYa + FYb + and FYa + FYb- individuals would have higher chemokine binding capacities than FYa-FYb + and FYa-FYb- individuals, and the FYa + FYb + and FYa + FYb- phenotype offer more protection against breast cancer than the FYa-FYb + and FYa-FYb- phenotypes. Here, FYB1 is linked to breast carcinoma.