Caspase-9 is the apoptotic initiator protease of the intrinsic or mitochondrial apoptotic pathway, which is activated at multi-protein activation platforms.
Caspases are divided into two groups: the initiator caspases (caspase-2, -8, -9 and -10), which are the first to be activated in response to a signal, and the executioner caspases (caspase-3, -6, and -7) that carry out the demolition phase of apoptosis.
Caspase-9:
Role: Initiator caspase in the intrinsic apoptotic pathway.
Cancers: Frequently studied in leukemia and solid tumors.
Prognosis: Reduced expression is often linked to chemoresistance and poor prognosis.
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