PADI2 and breast cancer: COL1A1 was observed to be highly expressed in breast cancer in both http://www.ncbi.nlm.nih.gov/geo/query/acc.cgi?acc=GSE80754 (Figure 1F) and http://www.ncbi.nlm.nih.gov/geo/query/acc.cgi?acc=GSE10797 (Figure 1G), whereas PADI2 was lowly expressed.