It is well known that MMP‐2 and MMP‐9 are overexpressed and promote cancer cell invasion and metastasis in many cancers (Chen et al., 2012; Kenny et al., 2008; Lee et al., 2008; Li et al., 2013; Roomi et al., 2009; Samantaray et al., 2004; Yan et al., 2011). The gene discussed is MMP9; the disease is cancer.