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Table 4 Immunohistochemical Results, Background Lymphocytes

From: Thymomas: a cytological and immunohistochemical study, with emphasis on lymphoid and neuroendocrine markers

Marker Thymoma Type
  A AB B1 B2 B3 MNT
CD57 S S S S S S
CD3 S + + + + +
CD5 S + + + + +
CD20 - + + -/+ -/+ +*
CD1a - + + + + +
CD99 - + + + + +
Ki67/MIB1 <10% >80% >80% >80% >80% >80%
  1. MNT = multinodular thymoma
  2. -/+ = variably (large numbers of intratumoral CD20+ lymphocytes in type B2 (n = 1) and type B3 (n = 3) thymomas associated with autoimmune disorder)
  3. * = numerous large stromal CD20+ lymphoid aggregates
  4. S = single cells