KEGG pathway enrichment analysis indicated that the genes regulated by miR-155 were significantly enriched in pathways in cancer, microRNAs in cancer, TNF signaling pathway, FoxO signaling pathway, prolactin signaling pathway, T cell receptor signaling pathway, signaling pathways regulating pluripotency of stem cells, HIF-1 signaling pathway, and PI3K-Akt signaling pathway (Fig. 7). Here, PRL is linked to cancer.