The importance of DC’s in governing response to therapies
in colorectal cancer patients is unknown. Factors released from the tumour microenvironment may inhibit DC function, www.selleckchem.com/products/nutlin-3a.html maturation and activation in the tissue. Circulating levels of myeloid and plasmacytoid DC’s may also be affected. Aims: The aim of this study is to assess the levels of circulating plasmacytoid DC’s (pDC) and myeloid DC’s (mDC) in colorectal cancer patients with different tumour staging pre-surgery and post surgery Methods: Whole blood was obtained from 30 patients pre-surgery, 10 patients post-surgery and 11 healthy controls. Cells were stained with Lin1-FITC, CD1c-PE, selleck products CD303-APC and their corresponding isotype controls. Samples were analysed by flow cytometry and levels of plasmacytoid and myeloid DC’s were measured as percentage of total cell number. Statistical analyses were performed using student t-test. Results: Plasmacytoid dendritic cell populations were significantly lower in cancer patients compared to healthy controls (p = 0.0001). Myeloid dendritic cell populations were also lower in cancer patients. A decreasing trend was observed in plasmacytoid DC levels with increasing stage, and this was statistically
significant for stage II (p = 0.03, n = 8) and stage III (p = 0.004, n = 12) cancers. Myeloid DC numbers also showed a declining trend with increasing stage. 5 patients showed an increase in post-surgery circulating pDC levels compared to pre-surgery. 4 additional patients showed a decrease in pDC levels post-surgery, and 1 patient had the same levels of pDC pre- and post-surgery. A similar trend was seen for the myeloid DC population. Conclusion: Colorectal cancer patients have significant lower numbers of plasmacytoid
DC, but not myeloid DC compared to healthy individuals, and interestingly, this is associated with severity of disease. Poster No. 94 Elevated Stromal Expression of VEGF-A Correlates with Reactive Stroma Appearance in a Human Prostate AMP deaminase Xenograft Model Viviana P. find more Montecinos 1 , Jennifer Hinklin1, Alejandro Godoy1, Claudio Morales1, James Mohler1, Gary Smith1 1 Urologic Oncology, Roswell Park Cancer Institute, Buffalo, NY, USA Many similarities exist between the stroma at sites of wound repair and reactive stroma in cancer. Common features include an elevated stromal cell proliferation, altered expression of matrix components, expression of several common stromal markers, and neovascularization. Although emerging data points to the fundamental role that carcinoma associated stromal cells play in angiogenesis, little is known about specific mechanisms and key regulatory components in prostate cancer or other tumors.