Primary and Secondary Cytotoxicity

Primary and secondary cytotoxicity does not refer to any specific molecule, receptor, enzyme, transporter, or other canonical therapeutic target. Instead, it describes the general property of being toxic to cells—i.e., causing cell damage or death through processes such as necrosis or apoptosis. Cytotoxic effects can be caused by chemicals, drugs (such as chemotherapeutics), toxins, immune cells like cytotoxic T lymphocytes and natural killer cells, radiation particles, etc. In immunology and oncology research contexts: - Primary cytotoxicity may refer to direct killing of target cells by agents such as immune effector cells. - Secondary cytotoxicity could refer to subsequent rounds of cell death following initial injury/apoptosis/necrosis. However, these are descriptive terms for biological outcomes rather than names for discrete molecular targets. Therefore this entry should be flagged as incorrect if used in place of an actual druggable protein/receptor/enzyme.