A review of 277 cases of seminoma of the testis is presented with particular reference to comparison of treatment methods. The relative 5 year survival in 220 cases has been found to be 93 per cent and the absolute 5 year survival is 86 per cent. The results in cases with similar staging show no difference when treated by orchiectomy and irradiation versus orchiectomy, retroperitoneal lymphadenectomy and irradiation. The so-called anaplastic seminoma has been found to respond to treatment in a manner similar to the classical form of seminoma. The recommended treatment of choice for seminoma of the testis is orchiectomy followed by postoperative irradiation to the lymph node draining areas including the inguinal, iliac, para-aortic, mediastinal and left supraclavicular areas.