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For both primary and metastatic uveal melanoma cell lines, data from single and fractionated doses indicate large variations in radiosensitivity, which are mainly dominated by the intrinsic radiosensitivities. Doses of approximately 8 Gy in five fractions would be sufficient to eradicate 10(9) cells (approximately 1 cm3) of the most radioresistant tumor cell lines, but this schedule is an overkill for the radiosensitive tumor cell lines. Based on specific morphologic and histologic tumor markers, more individualized dose fractionation schedules could improve the therapeutic ratio for uveal melanomas.

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