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Most cancer cells displayed weak to moderate nuclear staining, in several cases combined with cytoplasmic positivity. A few cases of malignant glioma, lymphoma and testicular cancers exhibited strong nuclear positivity.
Moderate positivity was observed in most hepatocellular carcinomas, renal and testicular cancers as well as several gastric and pancreatic cancers. Remaining cancer tissues were weakly stained or negative.
A large protein complex, termed the anaphase-promoting complex (APC), or the cyclosome, promotes metaphase-anaphase transition by ubiquitinating its specific substrates such as mitotic cyclins and anaphase inhibitor, which are subsequently degraded by the 26S proteasome. Biochemical studies have shown that the vertebrate APC contains eight subunits. The composition of the APC is highly conserved in organisms from yeast to humans. The exact function of this gene product is not known. Two transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Nov 2013]