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Long-term results of para-aortic irradiation for patients with stage I seminoma of the testis.

PURPOSE: Adjuvant postoperative para-aortic lymph nodal irradiation is an acceptable alternative to para-aortic and ipsilateral pelvic irradiation postorchiectomy for patients with Stage I seminoma of the testis. In this article, we report the long-term results of our prospective evaluation of para-aortic irradiation only for such patients.

METHODS AND MATERIALS: Between March 1991 and September 2000, 71 patients with Stage I seminoma were treated with adjuvant irradiation to the para-aortic region only after radical inguinal orchiectomy. Radiotherapy was delivered using parallel-opposed fields extending from T11 to L5. A total dose of 25 Gy in 15 fractions was prescribed to midpoint. Follow-up was performed every 3 months for the first year, every 4 months for the second and third years, every 6 months for the fourth and fifth years, and annually thereafter. Chest X-ray, tumor markers, and computed tomography scan of the pelvis were performed routinely as part of the follow-up investigation.

RESULTS: At a median follow-up of 75 months, 68 of 71 patients are alive and free of relapse. Only 1 patient (1.4%) experienced failure in the ipsilateral inguinal nodal region. Two patients (2.8%) died of unrelated causes. The actuarial 10-year relapse free survival is 98.5% and the actuarial 10-year overall survival is 92%. No late toxicity has been encountered.

CONCLUSION: Patients with Stage I seminoma of the testis may be safely treated with para-aortic radiotherapy only. Risk of pelvic failure is very low and treatment toxicity minimal.

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