Organ-confined prostate cancer cell line HH870 and primary and metastatic epithelial ovarian cancer cell lines (HH450 and HH639) seeded (2.5 · 10 5 cells) in flasks with or without various concentrations (25, 50, 75 or 100 mM) of ECG or EGCG were photographed under a light microscope after the untreated control cells reached confluency (Fig. 3 ). Both ECG and EGCG significantly affected the density of each cell line at or above 75 mM. The decrease in cell density at higher concentrations is much pronounced for ECG than for EGCG, a finding significant considering recommendations of clinical trials with EGCG (19) .