Plasma cell enrichment techniques concentrate the overall population of
plasma cells, thereby increasing the detection and frequency of abnormalities.
Cytogenetic analysis of plasma cell disorders (PCD) is diﬃcult due to
the low proliferative rate of plasma cells in vitro. Although interphase
ﬂuorescence in situ hybridization (FISH) has improved the detection of
abnormalities in PCD, cases having a low level of plasma cells often give
false negative results by FISH.
In concert with the recommendations by the International Myeloma Working
Group, Inform Diagnostics performs FISH analysis on enriched cells to
identify patients with suspected PCD.
Plasma Cell Enrichment
● On average, the percentage of plasma cells from enriched specimens can
be ten times greater than nonenriched specimens, thereby increasing the
percent of abnormal cells proportionately.
● FISH results from enriched cells can identify genomic aberrations in
cases that did not demonstrate a PCD by ﬂow cytometry, morphology, cytogenetics
or FISH performed on non-enriched cells.
● Enriched FISH studies can detect abnormalities with as few as 0.04% plasma cells.
● For cases suggesting PCD, Inform Diagnostics will perform FISH on enriched
plasma cells concurrently with ﬂow cytometry and morphology.
● The International MyelomaWorking Group recommends that techniques for
plasma cell selection or enrichment should be performed as a routine pre-analytic
processin the FISH analysis of all patients with multiple myeloma. 1
1. Fonseca R. et al. International Myeloma Working Group molecular classiﬁcation
of multiple myeloma: spotlight review. Leukemia. 2009;23:2210