To further verify the cellular source of these cytokines in the RM-1 xenografts in vivo, we FACS separated prostate tumor epithelial cells (Lin-CD49f+), stromal cells (Lin-CD49f-) and myeloid cells (CD45+CD11b+) and examined the expression of the three cytokines by qRT-PCR. Here, ITGA6 is linked to prostate neoplasm.