Homo sapiens Targeted Locus (Loci)

Extramedullary relapse (EM) of multiple myeloma (MM) is defined as infiltration of plasma cells (PC) outside of the bone marrow. EM is an aggressive form of the disease with a dismal outcome. We present cytogenetic findings of a 52-year-old female patient who was diagnosed with MM in 2008 and progression of MM to EM and plasmocellular leukemiaEM relapse of this patient was connected to a change of the entire genome profile. We suppose that the extramedullary lesion originated by an expansion of one clone of tumor plasma cells from the bone marrow, which was confirmed by identical genomic profile of both tested samples. Thus, change of ploidy status should be considered as potential hallmark of adverse course of the disease.