[Prognostic value of various factors in the treatment of patients with primary malignant tumors of the pelvic bones].

The time of life of 219 patients with primary malignant tumors of bones of the pelvis were analyzed in order to study the influence of different factors on the survival rate of the patients. It was shown that a considerable improvement of some results in the treatment of chondrosarcomas and chordomas was achieved after ablative removal of tumors, in reticulosarcoma and Ewing sarcoma--after a combined chemo-radial treatment with prophylactic courses of the therapy during 2 years. The combination of operation and radiotherapy for the treatment of chordomas gave a reliably higher survival of the patients within 5 years of observation. Prognosis in osteogenic sarcoma and angiosarcoma are extremely unfavorable regardless of the method of treatment.