Table 2. Inhibitory Effect of Compounds 1, 2, and INDO on Cell Proliferation.

cmpd	LNCaP IC50 ± SEM (μM)	VCaP IC50 ± SEM (μM)	HCT 116 IC50 ± SEM (μM)	HT-29 IC50 ± SEM (μM)
INDO	238.4 ± 1.1	136.9 ± 1.0	136.8 ± 1.0	312.6 ± 1.1
1	141.2 ± 1.0b	138.1 ± 1.2	78.9 ± 1.2	134.7 ± 1.2a
2	116.6 ± 1.1c	69.1 ± 1.0d,e	110.7 ± 1.2	82.0  ± 1.2b

^ap < 0.05.

^bp < 0.01.

^cp < 0.001.

^dp < 0.0001 compound 1 or 2 vs INDO.

^ep < 0.0001 compound 2 vs 1.