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A. Tumors highly infiltrated by CD163 positive macrophages did not respond to induction chemotherapy. DAB x 200. B. S100 moderately infiltrated carcinoma. DAB x 100. C. Strong PD-L1 expression. DAB x 200. D. CTLA4 tumor cells expression. DAB x200. DAB: 3,3′ diaminobenzidine.
