MMP9 and lobular neoplasia: MMP9 mRNA was expressed by MCs under normal conditions (0.000078 [0.000011–0.00022]) and this was significantly increased by treatment with sera from active LN patients (0.00045 [0.00026–0.00071]; p = 0.011), no other treatments induced any changes in MMP9 mRNA (Fig. 6b).