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Immunohistochemical examination of tumor‐infiltrating immune cells in a patient with pulmonary pleomorphic carcinoma. (a) CD3+ lymphocytes, (b) CD68+ macrophages, (c) CD8+ cells, (d) CD4+ cells, (e) PD‐1+ cells, and (f) FOXP3+ regulatory T cells are seen within the tumor (original magnification 100×).
