The invention relates to a
chimeric antigen receptor (CAR) immune
cell provided with a safety switch as well as a preparation method and an application of the CAR immune
cell. The CAR immune
cell carrying the safety mechanism (the safety switch) comprises a CAR coding
nucleotide sequence, wherein the structure of the
nucleotide sequence comprises a
receptor structural domain for recognizing tumor-specific
antigen or tumor-associated
antigen, a transmembrane-stimulation structural domain, a CD3[zeta] stimulating
signal transduction region and a
suicide gene region. The CAR immune cell can be obtained as different immunological effect cells are amplified and a CAR sequence carrying a suicide mechanism is transduced; corresponding antigens of
tumor cells are recognized by virtue of CAR; and the CAR immune cell can generate a specific killing effect on the
tumor cells. The CAR immune cell, when used, is infused in a gradient mode and dynamic change in related cell factor levels is monitored; in case of need, a
suicide gene can be started by virtue of drugs to scavenge the immunological effect cells, so that optimal balance between safety and a
curative effect is achieved; therefore, the safety of the technology applied to the treatment of tumors in the clinical field is guaranteed to the greatest extent.