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Cisplatin-based chemotherapy followed by focal, reduced-dose irradiation for pediatric primary central nervous system germinomas.

The objective of this study was to evaluate retrospectively one institution's experience treating pediatric central nervous system (CNS) pure germinomas with platinum-based chemotherapy followed by focal, reduced-dose irradiation. Eight patients were identified with localized, pure CNS germinomas from 1993 to 2004 at the authors' institution. The median age at diagnosis was 13 years (range 7-19). The median follow-up was 40 months (range 8-141). The tumor location was suprasellar in four, the pineal region in three, and the third ventricle in one. Irradiation was started a median of 20 weeks (range 17-22) from diagnosis and consisted of conformal fields to the primary site as determined by the initial diagnostic MR plus a 1.5- to 2-cm margin. Six of the eight patients received a dose of 3,060 cGy; two patients received 3,600 cGy. The 5-year actuarial event free survival was 71% (56-86%, 95% CI). Two patients suffered marginal (at field edge) failures and both were salvaged using reinduction platinum-based chemotherapy followed by cranial spinal irradiation and a boost to the primary tumor. The 5-year actuarial overall survival was 100%. There were no spinal failures. These data suggest that a reduction in both volume and dose (30.6-36 Gy) retains the excellent survival rates for patients with localized, pure germinomas of the CNS. A higher rate of ventricular relapse rate is observed, although salvage of those patients is feasible.

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