NCIt definition : The hydrobromide salt form of nirogacestat, a selective gamma secretase (GS) inhibitor
with antitumor activity. Upon administration, nirogacestat targets and binds to GS,
thereby blocking the proteolytic activation of Notch receptors. This inhibits the
Notch signaling pathway and results in the induction of apoptosis in tumor cells that
overexpress Notch. The integral membrane protein GS is a multi-subunit protease complex
that cleaves single-pass transmembrane proteins, such as Notch receptors, at residues
within their transmembrane domains. Overexpression of the Notch signaling pathway
has been correlated with increased tumor cell growth and survival.;