Because ameloblastoma tumor tissue did not express MMP‐9 with neither of the two different MM‐9 –antibodies used, our results challenge the previous studies where MMP‐9 claimed to be expressed by the tumor cells as well (Pinheiro et al., 2004; Ribeiro et al., 2009; Yang et al., 2018). The gene discussed is MMP9; the disease is neoplasm.