Putative genes involved in ductal carcinoma progression. (a) Venn diagram depicting the common and distinct genes in each comparison (downregulated and upregulated genes were analyzed separately). (b) Dendogram based on the expression profile of the 147 gene set. Green circles indicate non-neoplastic samples; yellow indicates pure DCIS, and red indicates in situ component of DCIS-IDC samples. (c) Legend of cluster support. (d) Scaled down representation of the entire cluster shown in panel b. Each row represents a single gene and each column a sample. Red indicates upregulation, green indicates downregulation, and black indicates no change in expression level compared with the reference sample. Gray indicates that no intensity was detected. DCIS, ductal carcinoma in situ; DCIS-IDC, ductal carcinoma in situ with co-existing invasive ductal carcinoma.