A schematic for the mechanisms by which chemotherapy elicits its pro-cancer effect via modulations of macrophages and endothelial cells. Blue text indicates the changes induced by chemotherapy; blue arrow denotes increase induced by chemotherapy; black arrow indicates promoting the events; black down arrow indicates decrease. Mϕ, macrophage; TEM, Tie2-expressing macrophage; TMEM, tumor microenvironment metastasis; EC, endothelial cells; iM, inflammatory monocyte; DCs, dendritic cells; CTC, circulating cancer cells; TIC, tumor initiation cell; TIMP, tissue inhibitor of metallopeptidase; the green and pink shades denote that the corresponding cells are altered.