Extramedullary disease portends poor prognosis in multiple myeloma and is over-represented in high-risk disease even in the era of novel agents oleh Saad Z. Usmani, Christoph Heuck, Alan Mitchell, Jackie Szymonifka, Bijay Nair, Antje Hoering, Yazan Alsayed, Sarah Waheed, Sajjad Haider, Alejandro Restrepo, Frits Van Rhee, John Crowley, Bart Barlogie