Overexpression of MMP-9 was observed in various cancers, including breast (Yousef et al., 2014), gastric (Prathipaa et al., 2021), non-small-cell lung (Yamaguchi et al., 2004), prostate (Ma et al., 2016), and OSCC (Umashankar et al., 2021). Here, MMP9 is linked to cancer.