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Non-relapse mortality and relapse by route of busulfan administration. Intravenous (i.v.) busulfan is associated with a slightly increased risk of non-relapse mortality [i.v. busulfan subdistribution hazard ratio 2.58 (95% CI 1.02, 6.5), p = 0.045]. No statistically significant difference in relapse was noted by route of busulfan administration [i.v. busulfan subdistribution hazard ratio 0.63 (95% CI 0.29, 1.4), p = 0.258].
