The results of systematic pelvic lymphadenectomy in 25 cases of early stage prostatic cancer treated by radiotherapy are presented. The relationship between the frequency of the metastatic lymph nodes and the staging and grading of the primary tumor is stressed; the prognostic interest of lymphadenectomy is underlined. From a therapeutic point of view, local radium therapy is associated with external cobalt therapy allowing the administration of 7,000--8,000 rad without severe complication. The results are satisfactory after a 36-month follow-up.