GSTM1 and metastatic malignant neoplasm in the lymph nodes: Additionally, more investigations are needed to precisely define the prognostic value of other parameters, namely pre-treatment levels of Hb and LDH, performance status, analgesic intake, bone or lymph node metastases, the intensity of uptake in the pre-treatment PET/CT, and pre-treatment PSA level, as well as the dose and number of cycles of the therapy.