MT4 and toxic multinodular goitre: There were no significant differences between patients with PTC and MNG (MT4-MMP: 4.90 ± 1.35 vs. 4.89 ± 1.37 ng/mL, P = 1.000; MT6-MMP: 8.29 ± 2.50 vs. 7.34 ± 2.09 ng/mL, P = 0.238).