The present invention relates to methods for predicting and treating/preventing bone metastases in prostate cancer patients. In particular, the present invention relates to a method for predicting the occurrence of bone metastases in a prostate cancer patient comprising i) determining the level of expression of ERRα in a prostate tumor sample obtained from the patient, ii) comparing the level determined at step i) with a predetermined reference value and iii) concluding that there is a high risk that the patient develops bone metastases when the level determined at step i) is higher than the predetermined reference value or concluding that there is a low risk that the patient develops bone metastases when the level determined at step i) is lower than the predetermined reference value.
