Table 2.

IC50 values of the compounds for CCLP-1 cells.

^a clinical trials on chemoprevention and dietary intervention for different tumours (www.clinicaltrials.gov)

^b estimated by linear interpolation between the data points around 50% cytotoxicity from Fig. 1 A, B

^c calculated from the data obtained at 72 hrs after incubation with different concentrations using the RTCA software 1.2.1 (Roche Applied Science)

^d n.c., not calculable, n.d., not determined