Abstract:The identification of acquired CALR mutations in patients with essential thrombocythaemia (ET) or myelofibrosis (MF) has meant that disease-initiating mutations can now be detected in about 90% of all patients with a myeloproliferative neoplasm (MPN). Here, we show that only those CALR mutations that cause a +1 frameshift, thereby altering the carboxy-terminus of calreticulin, promote cytokine independence in vitro; in-frame deletions were not functional, and are unlikely to be the pathogenetic mutation underl… Show more
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