NCIt definition : An orally bioavailable inhibitor of checkpoint kinase 2 (chk2), with potential antineoplastic
and chemopotentiating activities. Upon oral administration, Chk2 inhibitor PHI-101
binds to and inhibits the activity of chk2, which may prevent the repair of DNA damage
caused by DNA-damaging agents. This may result in tumor cell apoptosis and potentiate
the antitumor efficacies of various chemotherapeutic agents. Chk2, an ATP-dependent
serine-threonine kinase, is a key component in the DNA replication-monitoring checkpoint
system and is activated by double-stranded breaks (DSBs); activated chk2 is overexpressed
by a variety of cancer cell types.;
Semantic type(s)