POR and colon carcinoma: The logarithms of the geometric averages of ArN→O reactivity in P450R- and PfFNR-catalyzed reactions (log kcat/Km (avge)), their octanol/water distribution coefficients at pH 7.0 (log D), their concentrations for 50% cell survival (cL50) in murine hepatoma MH22a cells, and their concentrations causing 50% maximal proliferation inhibition (GI50) of human colon carcinoma HCT-116 cells.