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Kaplan-Meier curves comparing progression-free survival (A) and overall survival (B) of grade III oligodendrogliomas (OIIIs) according to their gene amplification and status of chromosome arms 1p/19q (log-rank test). The x-axis indicates survival in years and the y-axis the percentage of survivors. Continuous lines, dotted lines, and broken lines indicate chromosomes arms 1p/19q codeleted, non-1p/19q codeleted and non–gene amplified, and gene-amplified OIIIs, respectively.
