IL13 and breast cancer: Conversely, serum levels of IL-13, a Th2-associated cytokine, in the BC group (14.79 ± 0.45) were 40% lower than in the BBD group (24.92 ± 8.68 pg/ml) with borderline difference (p = 0.0608) (Figure 1B), and the concentrations of IL-12, a Th1-type cytokine, were 35% lower in the BC group (6.143 ± 0.25 pg/ml) than in the BBD group (9.39 ± 2.11 pg/ml) with statistical significance (p = 0.0178) (Figure 1C).