The inhibitory effect of apatinib on different small cell lung cancer cells and in lung cancer-bearing mice and patients

PurposeTo observe the inhibitory effect of the small molecule tyrosine kinase inhibitor apatinib on small cell lung cancer in vitro and vivo.Material and methodsThree small lung cancer cells were selected CCK-8 and monoclonal assay was used to determine the effect of apatinib on proliferation. The effects on cell cycle and apoptosis were detected by flow cytometry and TUNEL. We observed the inhibitory effect of different doses of apatinib on xenograft tumor. The efficacy and safety of apatinib in 20 patients with advanced small cell lung cancer were observed.ResultsFor small cell lung cancer with high expression of VEGFR2, apatinib has a significant inhibitory effect both in vitro and in vivo. It can play an inhibitory role by promoting apoptosis and cell cycle arrest pathways. For small cell lung cancer with low expression of VEGFR, the inhibitory effect on cells in vitro was not significant. It has certain inhibitory effect on nude mouse transplanted tumor and small cell lung cancer patients, but the effect is weaker than that of animal models and patients with small cell lung cancer cells with high expression of VEGFR2.ConclusionApatinib has a significant inhibitory effect on small cell lung cancer with high expression of VEGFR2 and may be a treatment for small cell lung cancer patients. Apatinib inhibited the proliferation of VEGFR-2 high-expression small lung cancer cell lines H446 and H69 in a concentration-dependent manner. In vivo studies showed that both H446 and H69 xenografts were significantly inhibited by low- and high-dose apatinib. Apatinib also has some efficacy in patients with small cell lung cancer. image