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Table 3 Immunohistochemical Results, Tumor Cell Expression

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

Marker

Thymoma Type

 

A

AB

B1

B2

B3

MNT

EMA

+

+

Focal

S

+

+

CK7

+

+^

+

+

+

+

CK20

-

-

-

-

-

-

CD57

S

S

S

+*

+*

+

CD5

-

-

-

-

-/+

-

Bcl-2

-

-

-

-

-/+

-

Calretinin

S

S

S

S

S

S

Vimentin

+

+

-

-

-

-

CD20

+

+

-

-

-

-

  1. MNT= micronodular thymoma
  2. S = single cells
  3. +^ = neoplastic epithelial cells in type B component were CK7 negative
  4. -/+ = variably (2 sporadic type B3 thymomas stained strongly positive)
  5. +* = strong expression in type B2 (n = 1) and type B3 (n = 3) thymomas associated with autoimmune disorder; scattered positive neoplastic cells in sporadic thymomas
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Diagnostic Pathology

ISSN: 1746-1596

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