CCR6 and neoplasm: Overall, our results suggest that the reduction in NK cells, CD4−CD8−γδ−, γδ T cells, and Th1 cells in luminal B tumors, together with an increase in Tregs and CD196-expressing cells (Th17, Th1/17, Tc17, and Tc1/17), may contribute to an immunosuppressive environment favoring tumor progression.