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Autologous stem cell transplant (Auto-SCT) is increasingly used in older patients with multiple myeloma (MM), despite lack of phase 3 trials in this age-defined population. For 207 consecutive MM patients who underwent Auto-SCT and were 70 years or older at transplant (study cohort), data were analyzed and compared with a younger cohort (1764 Auto-SCT patients< 70 years old). The proportion of Auto-SCT in the older patients increased from 7.8% of all transplants in 1998–2006 to 12.9% in 2007–2015. Sixty percent of patients required stem cell mobilization with chemotherapy or plerixafor. Full-dose melphalan conditioning was given to 55% of the older patients compared with 93% of the younger patients (P< 0.001). Older patients were more likely to be hospitalized (64% vs 55%; P= 0.01), but hospitalization duration was comparable. For newly diagnosed patients, median PFS was 33.5 months for the older …