CX3CL1 and cancer: Increased levels of CX3CL1 (from 75 to 115 pg/mL, p = 0.0056) and CCL11 (from 13 to 20 pg/mL, p = 0.0077) were also observed in S + M2 (Figure S5a), which can be explained by the interaction of 4T1/GFP cancer cells with the M2 activation factor IL-4 (Figure 5a).