Our study is the first to show CD123 is positive in a subset of formalin-fixed, paraffin-embedded MGZLs and CHLs, in contrast to PMBL which is largely negative. Staining for fascin was not significantly different between the lymphomas, but was less likely to be positive in PMBL. These findings suggest a role for CD123 and fascin in supporting diagnoses of MGZL and CHL, and in ruling out PMBL. By immunohistochemistry, PD-L1 is positive in MGZL, pointing to its therapeutic potential.
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