Usefulness of Sarilumab in Patients with Rheumatoid Arthritis after Regression of Lymphoproliferative Disorders

Figure 1

Lymphoproliferative disorders in patient 1. (a) Pathology of the mass shows medium-to-large lymphoid cells with pale cytoplasm and polymorphic nuclei (H&E stain ×200). (b) Immunohistochemical staining shows that the lymphoid cells are positive for CD20. (c) Lymphoid cells are positive for EBV-encoded small RNA in in situ hybridization. H&E: hematoxylin and eosin; EBV: Epstein–Barr virus.

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