Annexin A2 Expression in the Aerogenous Spread of Pulmonary Invasive Mucinous Adenocarcinoma with Gastric Lineage

Figure 4

Immunostaining of mucin glycoproteins in the left lung tumor. (a) Diffuse cytoplasmic positivity is visible in the lepidic or papillary component, and positive staining is present in the alveolar spaces (arrows). MUC 5AC immunostain, scale bar: 200 μm. (b) Floating tumor cells exhibit the same positive reaction. MUC 5AC immunostain, scale bar: 100 μm. (c) Some tumor cells exhibit cytoplasmic positivity. MUC 6 immunostain, scale bar: 200 μm. (d) In some cells, positive staining is visible on the cell surfaces but not in the cytoplasm. MUC 1 immunostain, scale bar: 100 μm.

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