CCL18 and breast cancer: To determine the role of miR98 and miR27b in CCL18-promoted breast cancer metastasis, we transfected miR98 or miR27b mimics or their negative controls into MDA-MB-231 or MCF-7 cells, and determined by qRT-PCR that the reduction of miR98 or miR27b was reversed by the miRNA mimics (data not shown).