[Fertility in patients treated for malignant tumors before puberty].

35 patients with malignant tumours were examined. In 4 of them comprehensive therapy was initiated in the course of the first five years of life. In the remaining 31 cases the first symptoms of the disease appeared between the ages of 9 to 16 years. In the entire group spermiogenic function was insufficient in about 65% of the afflicted. Subnormal values of plasma testosterone were found only in 9%.