MMP13 is differentially expressed and down-regulated in brain metastatic breast cancer.
Brain metastases are a clinical problem in patients with breast cancer (1-3). We mined published microarray data (4, 5) to discover genes associated with brain metastasis in patients with brain metastatic breast cancer. We found that the gene encoding the matrix metalloproteinase 13, MMP13, was among the genes most differentially expressed in the brain metastases of patients with brain metastatic breast cancer. MMP13 may be of relevance to the biology underlying metastasis to the brain in humans with metastatic breast cancer. MMP13 now joins MMP14, MMP11 and MMP2 among matrix metalloproteinases we have found to be differentially expressed and down-regulated in the brain metastases of humans with metastatic breast cancer (6-8).