Fig. 2

MMP-9 expression in PTC. A A total of 1345 PTC patients were collected from thirteen studies to assess whether the expression of MMP-9 in PTC is associated to LNM. B A total of 601 female and male patients with PTC were collected from five studies. C The OR of the ten studies was pooled, including 1104 stage I/II and stage III/IV. D Pooled OR from eleven studies, including 1162 patients with PTC. E A total of 578 PTC patients were collected from six studies