MMP1 Overexpression Promotes Cancer Progression and Associates with Poor Outcome in Head and Neck Carcinoma

Figure 2

Immunohistochemical staining of MMP1 in human HNSCC samples. (a, b) Representative negative staining of MMP1 in normal oral epithelial. (c, d) Representative low expression of MMP1 in primary human HNSCC sample. (e, f) Representative high expression of MMP1 in primary human HNSCC sample. Nuclei are counterstained with hematoxylin. The areas marked by black box in the (a, c, e) images (upper panel) were shown in larger magnification as (b, d, f) images (lower panel), respectively. Scale bar: 100 μm.

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