RESUMEN
<p><b>OBJECTIVE</b>To investigate the expression and significance of matrix metalloproteinases (MMP-2, MMP-9) and tissue inhibitor of matrix metalloproteinase (TIMP-2, TIMP-1) in non-melanoma skin cancer (NMSC).</p><p><b>METHODS</b>Thirty six patients with squamous cell carcinoma (SCC) and 32 patients with basal cell carcinoma (BCC), confirmed by pathology, were selected, and 30 cases of normal skin were selected as control. The expression of MMP-2, MMP-9, TIMP-1 and TIMP-2 in all samples were examined by immunohistochemistry and reverse transcription polymerase chain reaction (RT-PCR). The expression rate, expression intensity and expression level of each factor were recorded. The results were compared between the groups.</p><p><b>RESULTS</b>The expression rates of MMP-2 and MMP-9 in the control group were 30.0% and 36.7%, the expression levels of MMP-2 and MMP-9 in the control group were 57.216 ± 12.785 and 59.318 ± 13.262, all significantly lower than those in the tumor edge and center of the SCC and BCC groups (P < 0.01). The expression rates of TIMP-1 and TIMP-2 in the control group were 96.7% and 100%, their expression levels were 121.738 ± 25.516 and 122.612 ± 25.964, all significantly higher than those in the SCC and BCC groups (P < 0.01). The expression levels of MMP-2 and MMP-9 in the tumor center and edge of SCC group were significantly higher than those in the corresponding parts of the BCC group, while the expression levels of TIMP-1 and TIMP-2 were significantly lower than those in the BCC group (P < 0.01). The expression levels of MMP-2 and MMP-9 in the tumor edge of the SCC and BCC groups were significantly higher than those in the tumor centers (P < 0.01), while the expression levels of TIMP-1and TIMP-2 were significantly lower than those in the tumor centers (P < 0.01).</p><p><b>CONCLUSION</b>MMP-2, MMP-9 and TIMP-2, TIMP-1 may play an important role in the development, progression, invasion and metastasis of non-melanoma skin cancer.</p>