Studies have shown that MMP9 expression is regulated in ovarian cancer, cervical cancer, non-small cell lung cancer and breast cancer, all of which demonstrate a close relationship to cisplatin sensitivity (Rauvala et al., 2006; Braicu et al., 2014; Qiao et al., 2020; Makhoul et al., 2016). Here, MMP9 is linked to non-small cell lung carcinoma.