Single-cell suspensions were made from primary tumors as previously described(58 (link), 59 (link)). Cells were stained with fluorescence-conjugated antibodies (BioLegend, eBioscience, BD) and isotype matched IgG controls. The cells were analyzed on a LSRII flow cytometer (BD). FACS was performed with a FACSAria flow cytometer (BD) EpCAM+CD45-PDGFRa-, PDGFRa+CD45-EpCAM-, FLT4+CD45-EpCAM-PDFRa-, LYVE+ CD45-EpCAM-PDFRa-, CD45+EpCAM-CD11b+F4/80+, CD45+Gr1+ cell were collected for gene expression analysis. DAPI was used to exclude dead cells.