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• W2954062012 abstract "Abstract Somatic frameshift mutations in the calreticulin (CALR) gene are key drivers of cellular transformation in myeloproliferative neoplasms (MPN). All patients carrying these mutations (CALR+ MPN) share an identical sequence in the C-terminus of the mutated CALR protein (mut-CALR), with the potential for utility as a shared neoantigen. Here, we demonstrate that although a subset of patients with CALR+ MPN develop specific T-cell responses against the mut-CALR C-terminus, PD-1 or CTLA4 expression abrogates the full complement of responses. Significantly, blockade of PD-1 and CLTA4 ex vivo by mAbs and of PD-1 in vivo by pembrolizumab administration restores mut-CALR–specific T-cell immunity in some patients with CALR+ MPN. Moreover, mut-CALR elicits antigen-specific responses from both CD4+ and CD8+ T cells, confirming its broad applicability as an immunogen. Collectively, these results establish mut-CALR as a shared, MPN-specific neoantigen and inform the design of novel immunotherapies targeting mut-CALR. Significance: Current treatment modalities for MPN are not effective in eliminating malignant cells. Here, we show that mutations in the CALR gene, which drive transformation in MPN, elicit T-cell responses that can be further enhanced by checkpoint blockade, suggesting immunotherapies could be employed to eliminate CALR+ malignant cells in MPN. This article is highlighted in the In This Issue feature, p. 1143" @default.
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• W2954062012 date "2019-09-01" @default.
• W2954062012 modified "2023-10-18" @default.
• W2954062012 title "Immune Checkpoint Blockade Enhances Shared Neoantigen-Induced T-cell Immunity Directed against Mutated Calreticulin in Myeloproliferative Neoplasms" @default.
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• W2954062012 doi "https://doi.org/10.1158/2159-8290.cd-18-1356" @default.
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