NCIt definition : An orally available inhibitor of phosphatidylinositol 3-kinase (PI3K), with potential
antineoplastic activity. Upon administration, inavolisib binds to and inhibits various
members of the PI3K family, including activating mutations in the catalytic alpha
isoform PIK3CA. PI3K inhibition prevents the activation of the PI3K-mediated signaling
pathway and results in the inhibition of growth and survival of PI3K-overexpressing
tumor cells. Dysregulation of the PI3K signaling pathway is frequently associated
with tumorigenesis and tumor resistance to a variety of antineoplastic agents and
radiotherapy. PIK3CA, which encodes the p110-alpha catalytic subunit of the class
I PI3K, is frequently mutated in a variety of cancer cell types and plays a key role
in cancer cell growth and invasion.;