An immunohistochemical study of @entity538 ( @entity538 ), @entity2281 protein, cytokeratin (CKER), @entity2543 ( @entity2543 ), and transthyretin ( @entity20117 ) was carried out on 11 cases of @entity2846 ( @entity2846 ) and 19 of @entity424 , using the peroxidase antiperoxidase technique. Among the 11 cases of @entity2846 , all 11 were positive for CKER, @entity2543 , and @entity20117 , 10 for @entity2281 protein, and five for @entity538 . Most of the @entity538 -positive @entity1185 cells were simultaneously positive for CKER. However, these @entity538 -positive cells were negative for @entity20117 . Among the 19 cases of @entity424 , 16 were positive for @entity538 , 17 for @entity2281 protein, three for CKER, eight for @entity2543 , but none for @entity20117 . Some @entity538 -positive cells were also stained for CKER. However, @entity20117 was not found in any of the ependymal cells. These findings suggested that @entity2846 cells which show ependymal or glial differentiation lost the ability to synthesize @entity20117 which is known to be synthesized in the epithelial cells of the choroid plexus. The more @entity538 -positive cells present in a @entity2846 , fewer @entity20117 -positive cells are present. Though CPPs are usually easily distinguishable from @entity424 , occasional doubt arises concerning the differential diagnosis between @entity2846 and @entity424 . @entity20117 can be a very useful diagnostic marker of @entity2846 .

[Immunohistochemical study for @entity2846 and XXXX ].

@entity424 :: ('MESH:D004806', 'Disease') :: ['ependymoma', 'ependymomas', 'papillary ependymoma'] @entity1185 :: ('MESH:D010212', 'Disease') :: ['papilloma'] @entity538 :: ('2670', 'Gene') :: ['GFAP', 'glial fibrillary acidic protein'] @entity2543 :: ('MESH:D017573', 'Disease') :: ['EMA', 'epithelial membrane antigen'] @entity2846 :: ('MESH:D020288', 'Disease') :: ['CPP', 'choroid plexus papilloma'] @entity20117 :: ('7276', 'Gene') :: ['TTR'] @entity2281 :: ('6271', 'Gene') :: ['S-100']
@entity424 :: (MESH:D004806,Disease) :: ['ependymomas']
