The mean immunoscore and standard error are presented Table 2 Breast cancer clinicopathologic data Age (years) 27–83 Race

(%)    White 73  African American 24  Other 3 Tumor size (cm) 1.1–12.0 Lymph node status (%)    Positive 49  Negative 40  Unknown 11 Pathologic stage (%)    I–II 57  III–IV 29  Unknown 14 Higher Expression of FBLN1 in Fibroblastic Stroma is Associated with Lower Rates of Cancer Proliferation FBLN1 has been demonstrated to inhibit in vitro adhesion and motility of various cancer cell lines, including breast cancer [20, 21], and to suppress the growth OSI-906 of human fibrosarcoma cells [22]. Therefore, its loss in breast cancer stroma may allow enhanced growth and invasion of cancer cells. We compared proliferation of cancer epithelial cells in breast cancers with higher versus lower expression of FBLN1 in both stroma and epithelium. The mean FBLN1 immunoscore for each antibody in cancer stroma or epithelium Pexidartinib clinical trial was used as the corresponding cut-off value for higher versus lower expression. Proliferation was determined by

immunohistochemistry for Ki-67. In general, the rate of proliferation (i.e., the percentage of epithelial cells labeled by Ki-67) was lower in breast cancers with higher stromal FBLN1 expression (Fig. 6a). However, this difference was only statistically significant for stromal FBLN1 assessed with the A311 antibody (p = 0.034), but not with the B-5 antibody (p = 0.178) and not for epithelial FBLN1 with either antibody (A311, p = 0.468; B-5, p = 0.173). To determine whether there was any correlation between FBLN1 expression GNE-0877 in breast cancers and other indicators of invasiveness and growth (i.e., tumor size and lymph node metastasis) of the breast cancers, we compared these parameters

in cancers with higher versus lower FBLN1 immunoscores in stroma or epithelium with both antibodies. There was no significant difference in tumor size or the percentage of LY2835219 patients with lymph node metastases in FBLN1 higher versus FBLN1 lower (stromal or epithelial expression) cancers (Fig. 6b,c). Fig. 6 Proliferation, tumor size, and lymph node status in breast cancers with lower versus higher FBLN1 expression. Thirty-five breast cancers were assessed for FBLN1 expression by immunohistochemistry using antibody A311 or B-5. Cancers were divided into lower versus higher FBLN1 expression in stroma or epithelium based on the mean immunoscore for stromal or epithelial expression with each antibody (i.e., mean FBLN1 immunoscore was 0.74 for stromal expression with A311, 1.19 for stromal expression with B-5, 0.37 for epithelial expression with A311, and 0.08 for epithelial expression with B-5) (as in Fig. 3). a Proliferation, as measured by Ki-67 labeling of cancer epithelial cells, was lower in cancers with higher stromal expression of FBLN1, but this was statistically significant only with the A311 antibody (p = 0.034).