Effect of quercetin on colony-forming abilities of prostate cancer cell lines with different aggressive potentials. Effect of quercetin on colony-forming abilities of prostate cancer cell lines with different aggressive potentials. (A) Highly aggressive PC-3 cell line; (B) moderately aggressive DU-145 cell line; (C) minimally aggressive LNCaP cell line; (D) BG-9 normal skin fibroblasts. The data represent means ± standard errors of six experiments performed in sextuplicate. The statistical significance of the difference between control and treated cultures was calculated by Student's t test. Hari Krishnan Nair et al. Clin. Diagn. Lab. Immunol. 2004; doi:10.1128/CDLI.11.1.63-69.2004