LA and PPG cause the cleavage of PARP. (A) The samples treated with LA, 5-FU, and their combination promoted PARP cleavage; (B) the samples treated with PPG and 5-FU as well as their combination promoted PARP cleavage; (C) digitalized cleaved PARP in the samples treated with LA and 5-FU as well as their combination; (D) digitalized cleaved PARP in the samples treated with PPG and 5-FU as well as their combination. LA: 75 μmol/L; 5-FU: 200 μmol/L; PPG: 4 μmol/L; ** P < 0.01, compared with the controls; *** P < 0.001, compared with the controls; ## P < 0.01, compared with the samples treated with a single compound