The mentioned bacteria included Listeria monocytogenes, Methylobacterium radiotolerans JCM 2831, Xanthomonas albilineans GPE PC73, and Bradyrhizobium japonicum, which were negatively correlated with Gleason score, tumor–node–metastasis (TNM) stage, prostate-specific antigen (PSA) levels, and androgen receptor (AR) expression, respectively. This evidence concerns the gene KLK3 and neoplasm.