Eight cases of clear cell adenocarcinoma treated at The M. D. Anderson Hospital are reviewed. Six such lesions were primarily vaginal carcinomas and 2 involved the cervix. Five patients with early carcinomas were treated entirely with a transvaginal cone or interstitial irradiation and 4 are living and well, 2 to 8 years after completion of therapy. We believe that this experience justifies further treatment of early clear cell carcinomas with conservative radiation. This form of therapy is particularly important since the DES-exposed patients represent an identifiable high-risk group which should augment the chances for early diagnosis.