High serum-free light chain levels and their rapid reduction in response to therapy define an aggressive multiple myeloma subtype with poor prognosis

Frits Van Rhee, Vanessa Bolejack, Klaus Hollmig, Mauricio Pineda-Roman, Elias Anaissie, Joshua Epstein, John D. Shaughnessy, Maurizio Zangari, Guido Tricot, Abid Mohiuddin, Yazan Alsayed, Gail Woods, John Crowley, Bart Barlogie