“…Over the past two decades, many studies have demonstrated the action of indole compounds as potentially effective agents against bladder cancer, such as indole-3-acetic acid [4], Go-6976 [5], apaziquone [6], 5-hydroxyindole-3-acetic acid [7], arylindolylpropenones [8], and 3,3 ′ -diindolylmethane [9]. In this context, indole-3-carbinol (I3C) is an indole compound produced endogenously from natural glycosinolates contained in a wide variety of plant food substances, including members of the Cruciferae family, and particularly members of the genus Brassica, such as broccoli, cabbage, cauliflower, brussels sprouts, china cabbage, radish, turnip and rapeseed [10], being one of the metabolites resulting from the enzymatic oxidation of indole-3acetic acid [11], as well as to be the precursor of 3,3 ′ -diindolylmethane [12].…”