Figure 1. Expression of MMP-9, MMP-2, VEGF, VEGFR 2 in tumor samples and adjacent morphologically normal tissue samples. The vertical line combines paired samples: ⊡  - tumor tissue, ⋄  - morphologically normal tissue. N+ – paired tissue samples from group No. 1 (taken from patients with metastases in regional lymph nodes), N- – paired tissue samples from group No. 2 (taken from patients without metastases).