background and objectives: jak2 is a nonreceptor tyrosine kinase that plays a major role in myeloid disorders. jak2v617f mutation is characterized by a g to t transverse at nucleotide 1849 in exon 12 of the jak2 gene, located on the chromosome 9p, leading to a substitution of valine to phenylalanine at amino acid position 617 in the jak2 protein. in this study we compared two molecular methods ...

A 67-year-old man was admitted to our hospital with worsening odynophagia. He had been diagnosed as having chronic neutrophilic leukemia based on excessive neutrophilia without blasts, anemia, hyperplastic bonemarrowwith normal neutrophilic maturation, and hepatosplenomegaly, without bcr/abl rearrangement [1]. Finally, he was rediagnosed as having myeloproliferative neoplasm (MPN), unclassifiab...

Polycythemia vera (PV), essential thrombocythemia (ET), and primary myelofibrosis (PMF) constitute the BCR-ABL1-negative myeloproliferative neoplasms and are characterized by mutually exclusive Janus kinase 2 (JAK2), calreticulin (CALR), and myeloproliferative leukemia virus oncogene (MPL) mutations; respective frequencies of these mutations are approximately 95%, 0%, and 0% in PV, 60%, 20%, an...

The differential diagnosis of haematological abnormalities, such as leucocytosis, erythocytosis, thrombocytosis or indeed anaemia, is wide and disarming. Here we report on significant updates in the differential diagnosis of erythrocyosis and thrombocytosis presenting a simplified schema for the clinician. We then move to discuss significant advances in this field which have followed a series o...

27 Introduction The Janus kinases (JAKs) are a family of 4 nonreceptor tyrosine kinases that play an essential role in mediating cytokine signalling. JAKs associate with cytokine receptors that lack intrinsic kinase activity to mediate cytokine-induced signal transduction via the activation of the STAT transcription factors and other signalling pathways (Figure 1, page 28).1,2 The 4 family memb...