 - Immunocytochemistry performed on 4 μ-thick sections from paraffin blocks using the streptavidin-biotin-peroxidase technique. The sections will be routinely deparaffinized, rehydrated through graded alcohols to distilled water. Deparaffinized sections will be treated with 0.3 hydrogen peroxide for 10 min. Suitable antigen retrieval will be carried out. Blocking serum will be applied for 10 min. The sections will be incubated with antibody raised against 