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MTAP loss in tumors lacking 9p21 deletion. MTAP staining was completely absent in tumor cells of a NET of the lung (A), a NET of the ileum (B), a colorectal NET (C), a pancreatic NET (D), a T-cell non-Hodgkin lymphoma (E), a marginal cell lymphoma (F) and in 2 cases of Hodgkin lymphoma (G and H). Distinct MTAP positivity of intermingled stroma cells serves as a positive internal control.
