In the paper, A Role for DNA Methylation in Regulating the Growth Suppressor PMEPA1 Gene in Prostate Cancer, by Eric Richter, Katsuaki Masuda, Christopher Cook , Mathias Ehrich, Atekelt Y. Tadese, Hongyun Li, Anthony Owusu, Shiv Srivastava and Albert Dobi (Epigenetics 2007; 2:100-105), the authors found that the DNA probeset of GSTP1 is inaccurately shown (Materials and Methods, page 101). In the actual experiments, the correct set was used, thus the result and interpretation are correct.