Table 1. TC₅₀ of Tested Compounds on A549, H1299, H1975, and MRC-5 Cells^a.

	TC50 (μM)
compound	A549	H1299	H1975	MRC-5
3	22 ± 1.0	27 ± 0.8	28 ± 2.0	45 ± 8.0
4a	13 ± 0.3	13 ± 0.1	23 ± 2.0	17 ± 3.0
4b	17 ± 0.5	17 ± 0.3	35 ± 4.0
5a	32 ± 0.9	33 ± 0.7	33 ± 2.0
5b	19 ± 0.4	16 ± 0.6	25 ± 5.0
5c	11 ± 0.5	11 ± 0.3	15 ± 1.0	17 ± 0.3
5d	16 ± 0.4	18 ± 0.5	29 ± 4.0
regorafenib	13 ± 0.8	10 ± 0.4	16 ± 0.5	18 ± 2.0
Leflunomide	100 < TC50 <300	300 <	100 <	300 <

^aAll values are expressed as mean ± standard error (n = 6).