In contrast, M2→M1 macrophages reprogrammed in the presence of cancer cell spheroids had increased levels of CCL17 (from M2→M1 45 pg/mL to S + M2→M1 113 pg/mL, p = 0.0021) and CCL24 (from 3.3 to 5 ng/mL, p = 0.0356) (Figure 6). This evidence concerns the gene CCL17 and cancer.