A differential expression profile between primary breast tumor cell lines alone (T none) and those propagated in the presence of breast tumor fibroblasts (T+TF) was defined by a significant gene list comprised of 482 probe sets with an adjusted p-value<0.05, where 7 independent primary tumor cell lines were denoted as T, and primary tumor-derived fibroblasts as TF. Here, TF is linked to breast neoplasm.