The present invention relates to a composition for treating prostate cancer and, more specifically, to a composition for treating prostate cancer, which contains a peptide derived from telomerase and is effective in inhibiting growth and metastasis of prostate cancer cells. In addition, the present invention provides a composition and method for treating prostate cancer, wherein, when prostate cancer is treated, docetaxel and the peptide derived from telomerase are co-administered, thereby having a synergetic therapeutic effect compared with administration alone. Particularly, the present invention provides a treatment method useful for patients who do not have a sufficient anticancer effect merely through administration of docetaxel alone and patients who have hormone resistance.
