The results of a follow-up study carried out in 1975-76 are described. The study involved 454 patients who had received ultrasoft X-ray treatment for basal cell carcinomas during the period 1965-1969. In females, the percentage of recurrence was 4.9, in males, 11.9. The figures indicating the frequency of recurrence are minimum ones; the patients were selected to a certain extent, the large tumors being treated surgically. The most important result of the study was the observation that approximately 30% of the X-ray scars examined were so disfiguring from a cosmetic point of view that they must be characterized as unacceptable. The indications for X-ray treatment of basal cell carcinomas should, consequently, be limited to deep-growing tumors or tumors which are not well demarcated, and to tumors in elderly patients, who should be spared surgery.