Ludek Pour, Sabina Sevcikova, Henrieta Greslikova, Renata Kupska, Petra Majkova, Lenka Zahradova, Viera Sandecka, Zdenek Adam, Marta Krejci, Petr Kuglik, Roman Hajek. Soft-tissue extramedullary multiple myeloma prognosis is significantly worse in comparison to bone-related extramedullary relapse. Haematologica 2014;99(2):360-364; https://doi.org/10.3324/haematol.2013.094409.