Growth inhibition by combined use of COP/BER and chemotherapeutic agents in A549 cells. Effects of COP or BER, combined with 5-fluorouracil (5-FU), camptothecin (CPT), or paclitaxel (TAX), on the growth of A549 cells. COP-L: 1.6 μg/mL; COP-H: 6.4 μg/mL; BER-L: 0.5 μg/mL; BER-H: 4 μg/mL. *P < 0.05, compared to drugs alone. Values are means ± SD of 4 independent assays.