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Most malignant tissues showed weak to moderate cytoplasmic staining. Most testicular cancers and a few urothelial cancers displayed strong immunoreactivity.
Selected cases of breast, colorectal, testis cancers and gynaecological cancers showed moderate cytoplasmic positivity. Remaining malignancies were weakly stained or negative.
GENE INFORMATION
Gene name
APP (HGNC Symbol)
Synonyms
AD1
Description
Amyloid beta (A4) precursor protein (HGNC Symbol)
Entrez gene summary
This gene encodes a cell surface receptor and transmembrane precursor protein that is cleaved by secretases to form a number of peptides. Some of these peptides are secreted and can bind to the acetyltransferase complex APBB1/TIP60 to promote transcriptional activation, while others form the protein basis of the amyloid plaques found in the brains of patients with Alzheimer disease. In addition, two of the peptides are antimicrobial peptides, having been shown to have bacteriocidal and antifungal activities. Mutations in this gene have been implicated in autosomal dominant Alzheimer disease and cerebroarterial amyloidosis (cerebral amyloid angiopathy). Multiple transcript variants encoding several different isoforms have been found for this gene. [provided by RefSeq, Aug 2014]