Table 3.

Inhibition of in vitro cancer cell lines by benzo[f]indole-4,9-dione derivatives [IC₅₀ (μM) ± standard deviation] ^a.

Compd\Cells	MCF7	NCI-H460	SF-268	Detroit 551
15	4.98 ± 0.15	3.16 ± 0.13	27.41 ± 0.39	7.68 ± 0.58
16	4.95 ± 0.21	3.23 ± 0.34	25.76 ± 1.66	4.78 ± 0.57
CPT b	0.57 ± 0.03	0.03 ± 0.003	0.19 ± 0.006	0.99 ± 0.09

^a Values representative mean ± standard deviation from three experiments; and ^b CPT: camptothecin.