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Kaplan-Meier plots of survival probabilities: the patients carrying the pathogenic C9orf72 repeat expansion (or ALS-C9Pos, red line) display shorter survival time [median survival of 36 months (95% CI 30–43)] than the patients without genetic mutations (ALSwoGM, green line) [median survival of 42 months (95% CI 39–45)]. Log-rank χ2 = 3.88, p = .049; +: censored cases.
