The invention discloses application of parabacteroides dieldrii in preparation of a
medicine for treating prostatic
cancer, and belongs to the field of biological
medicine. It is found for the first time that the abundance of parabacteroides dieldrii in intestinal
flora of a
prostate cancer patient is remarkably reduced, and the parabacteroides dieldrii is selected as potential probiotics for inhibiting growth of
prostate cancer tumors. The result of a parabacteroides dieldrii single bacterium
colonization experiment shows that the parabacteroides dieldrii and the
metabolite gamma-
linolenic acid (GLA) thereof can efficiently inhibit the growth of the prostatic cancer tumor, can also improve the condition that the
treatment effect of
docetaxel on the prostatic cancer is poor due to abuse of clinical
antibiotics, and can be prepared into the
medicine for treating or assisting in treating the prostatic cancer. The invention provides a new
treatment strategy and medicine for the treatment of the prostatic cancer, and also provides a brand new medicine development path and a clinical application scheme for the micro-ecological treatment of the prostatic cancer.