CAFs promote proliferation of MDA-MB-231 cells in co-culture system compared with NFs.

<p>A. Cell growth curve determined by cell count. B. Representative DNA content of MDA-MB-231 cultured with normal medium and with conditioned medium derived from CAFs and NFs determined by flow cytometry. C. The percentages of cells in each of cell cycle phases shown by histogram for MDA-MB-231. The data were shown as mean±SD for 3 separate experiments (*<i>P</i><0.05; **<i>P</i><0.01).