ACUTE MYELOID LEUKAEMIA (NPMc+)

NPM1 exon 12 variants

Variants in exon 12 of the nucleophosmin (NPM1) gene have been reported to be AML specific and result in an accumulation of nucleophosmin (NPM) protein in the cytoplasm, other human neoplasms consistently show nucleus-restricted NPM expression (Falini et al. (2005) NEJM 352 (3) 254-266 and Falini et al. (2007) Blood 109 (3) 874-885). Due to the accumulation of NPM protein in the cytoplasm this subgroup of AML has been termed NPMc+ AML. NPM1 exon 12 variant analysis can therefore be used as a tool in the differential diagnosis of NPMc+ AML. However, the use of this variant for diagnostic purposes MUST be interpreted in combination with clinical and morphologic features.

NPM1 exon 12 variants are detected using fragment analysis in conjunction with capillary electrophoresis.

Laboratory contact: Dr. Caroline Wickham 01392 408252 caroline.wickham@nhs.net

Clinical contact: Dr. Paul Kerr 01392 402917 paul.kerr1@nhs.net

The laboratory participates in the NEQAS NPM1 exon 12 programme.