FeLV antigens were immunohistochemically detected in the hematopoietic cells of the bone marrow (Figure 1D, detail); however,
positive stain was not observed in tumoral cells.
Many reports mention that histological assessment was associated with a
positive stain in the ECM (10).
A diagnostic feature of rhabdomyosarcoma is a
positive stain for skeletal muscle differentiation.
The normal controls stained with IHC for dystrophin and b-spectrin showed
positive stain of the sarcolemmal membrane (Fig.
As an evaluation of immune staining, a
positive stain was indicated by a brown colored precipitate in the following manner: 1) cells labeled by CAL displayed cytoplasmic and nuclear staining; and 2) cells labeled by CEA displayed a cytoplasmic staining pattern.
The
positive stain for S-100 was also observed in 100% of the neurofibroma cases, which is a rate similar to that found in the literature.
Cells showing a strong
positive stain to PAS and negative stain to AB were observed.
sup][1],[4],[5] The
positive stain with CD68 can be explained by the intracytoplasmic accumulation of phagolysosomes and does not reflect a histiocytic origin.
In general, antibodies to the latency-associated nuclear antigen LANA1 are employed, with nuclear reactivity indicating a
positive stain.
Second, there was no clear definition of what was considered a
positive stain in the earlier studies (Table 1).
112-114)
Positive stains can be cytoplasmic, membranous, canalicular, and/or cytoplasmic dotlike.
