Coincidentally, Ruxandra Dobrescu draws a conclusion that serum MMP-9 levels not only show no differences between benign and malignant patients but also differ insignificantly in ages, histological subtypes, TNM stages, multifocal or unifocal tumors, small or large tumor sizes, lymph node metastasis, and extrathyroidal extension. Here, MMP9 is linked to neoplasm.