Optimal treatment of clinical stage I yolk sac tumor of the testis in children.

Thirty-four children with malignant germ cell tumors of the testis were seen at the Institut Gustave-Roussy from 1970 through 1980, after orchiectomy alone. The tumor was classified according the WHO classification (immature teratoma, embryonal carcinoma, choriocarcinoma, yolk sac tumor). Twenty-four of the 34 children had a stage I yolk sac tumor (YST) defined as a tumor completely removed by the inguinal approach, without clinical node involvement and/or metastases. No lymphadenectomy was performed. All the patients had an alphafetoprotein (AFP) determination before or after orchiectomy. For those (23/24) with an elevated level of AFP the clinical stage I was assigned if the AFP decreased regularly to normal values by 3 months after orchiectomy. Twelve patients received systemic chemotherapy every 3 months [methotrexate, actinomycin D, cyclophosphamide (Cytoxan)]; 12 did not receive any treatment after orchiectomy. An AFP evaluation was assayed for all of these regularly. The 3-year survival rate was 96% and the 3-year relapse-free survival rate was 84%, with no difference found between the two groups receiving or not receiving systemic chemotherapy. This series confirms the advisability of a conservative approach for clinical stage I YST, employing orchiectomy and evaluation including AFP determinations. Ten percent to 20% of patients will suffer a relapse, which can be demonstrated by an increasing level of AFP, and these children can be treated at this time. With this approach, 80% of patients having clinical stage I YST can be treated by orchiectomy alone and will not suffer any sequelae or complication of either lymphadenectomy or chemotherapy. For the few who do relapse, treatment at the time of relapse is curative for the majority. This approach requires absolute adherence to a strict follow-up program.