2 × 104/ml cell suspension fluid was inoculated in 96-well plates, and cultured for 96 h, respectively. Following that, the plates were added with MTT solution, and incubated for 4 h, then added with DMSO to fully resolve MTT pyrolysis products. Optical density (OD) was measured by immunoassay analyzer at the wavelength of 570 nm. (A, B) Effect of PARP1 on the growth of A549; (C, D) effect of PARP1 on the growth of H1975; (E, F) effect of PARP1 on the growth of PC9.