The antitumor effect of tanshinone IIA on anti-proliferation and decreasing VEGF/VEGFR2 expression on the human non-small cell lung cancer A549 cell line oleh Jun Xie, Jiahui Liu, Heng Liu, Shihui Liang, Meigui Lin, Yueyu Gu, Taoli Liu, Dongmei Wang, Hui Ge, Sui-lin Mo