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BCR::ABL1-negative myeloproliferative neoplasms (MPN) are clonal hematological malignancies resulting from the proliferation of myeloid cells harboring a JAK-STAT pathway activating driver mutation. MPN management recommendations are based on the evaluation of different risks to prevent disease evolution associated events while preserving patients' quality of life. Such risks can be common across all MPN or specific to each subtype (polycythemia vera (PV), essential thrombocythemia (ET), prefibrotic myelofibrosis (pre-MF), primary myelofibrosis (PMF)). MF-patients harbor the worse prognosis and hematopoietic stem cell transplantation (HSCT) is the only curative treatment, at the expense of a high morbi-mortality. Therefore, accurate scoring systems to estimate overall survival are crucial for MF patients' management and selection for HSCT. In PV and ET, vascular events prediction is prioritized given their higher incidence and related morbi-mortality. Finally, quality of life evaluation is important for all subtypes. To predict these risks and adapt MPN therapeutic strategies, clinical risk scores have been developed over the past decades, more recently including molecular risk factors for more accurate risk stratification. The large number of scoring systems available in combination with disease heterogeneity and the necessity to predict diverse outcomes, make it difficult for clinicians to choose the most appropriate score to evaluate their patients' risk in 2024. Here, we provide an overview of MPN disease evolution associated events incidence and conduct an exhaustive comparative review of the scoring systems currently available for each risk. Finally, we propose an algorithm for the use of these scores in clinical practice in each MPN subtype., (Copyright © 2024 American Society of Hematology.)

Despite the advances in the understanding and treatment of myeloproliferative neoplasm (MPN), the disease remains incurable with the risk of evolution to AML or myelofibrosis (MF). Unfortunately, the evolution of the disease to MF remains still poorly understood impeding preventive and therapeutic options. Recent studies in solid tumor microenvironment and organ fibrosis have shed instrumental insights on their respective pathogenesis and drug resistance, yet such precise data are lacking in MPN. In this study, through a patient-sample driven transcriptomic and epigenetic description of the MF microenvironment landscape and cell-based analyses, we identify HOXB7 overexpression and more precisely a novel TGFβ-Wnt-HOXB7 pathway as associated to a pro-fibrotic and pro-osteoblastic biased differentiation of mesenchymal stromal cells (MSCs). Using gene-based and chemical inhibition of this pathway we reverse the abnormal phenotype of MSCs from myelofibrosis patients, providing the MPN field with a potential novel target to prevent and manage evolution to MF.

Abstract: With emerging new drugs in myelofibrosis (MF), a robust and harmonized framework for defining the severity of anemia and response to treatment will enhance clinical investigation and facilitate interstudy comparisons. Accordingly, the lead authors on the 2013 edition of the International Working Group-European LeukemiaNet (IWG-ELN) response criteria in MF were summoned to revise their document with the intent to (1) account for gender-specific differences in determining hemoglobin levels for eligibility criteria; (2) revise the definition of transfusion-dependent anemia (TDA) based on current restrictive transfusion practices; and (3) provide a structurally simple and easy to apply response criteria that are sensitive enough to detect efficacy signals (minor response) and also account for major responses. The initial draft of the 2024 IWG-ELN proposed criteria was subsequently circulated around a wider group of international experts and their feedback incorporated. The proposed articles include new definitions for TDA (≥3 units in the 12 weeks before study enrollment) and hemoglobin thresholds for eligibility criteria (<10 g/dL for women and <11 g/dL for men). The revised document also provides separate (TDA vs non-TDA) and graded (major vs minor response) response criteria while preserving the requirement for a 12-week period of screening and observation on treatment., (© 2024 American Society of Hematology. Published by Elsevier Inc. All rights are reserved, including those for text and data mining, AI training, and similar technologies.)

Spleen volume reduction (SVR) is a key endpoint in inhibitors of Janus kinase (JAK) inhibitor studies. Retrospective analyses have demonstrated an association between SVR and improved overall survival (OS) among patients treated with ruxolitinib with a platelet count > 100 × 10 9 /L. Whether this association occurs in patients with thrombocytopenia is unclear. Pacritinib, a JAK2/IRAK1/ACVR1 inhibitor, demonstrated improved SVR versus best available therapy (BAT [best available therapy]; including ruxolitinib) in patients with myelofibrosis and platelet counts ≤ 100 × 10 9 /L in the PERSIST-2 study. Patients on study at the start of the 12-week SVR window on pacritinib 200 mg twice daily or BAT were included. OS was evaluated among SVR responders versus non-responders using different SVR thresholds (≥ 35%, ≥ 20%, ≥ 10%, and > 0%). Among patients on pacritinib (n = 89), SVR ≥ 10% demonstrated the greatest separation in OS curves between responders and non-responders (HR, 0.00; 95% CI, 0.00-0.14; p < 0.01), though SVR ≥ 0% and SVR ≥ 20% were also associated with improved OS. No SVR threshold conferred OS benefit on BAT (n = 84), including ruxolitinib (n = 39). In patients with myelofibrosis and platelets ≤ 100 × 10 9 /L, achieving SVR on pacritinib, but not BAT (including ruxolitinib), was associated with significant OS benefit, suggesting that pacritinib may offer a unique survival advantage in patients with myelofibrosis and thrombocytopenia who achieve any SVR. Trial Registration: ClinicalTrials.gov number: NCT02055781., (© 2024 The Author(s). European Journal of Haematology published by John Wiley & Sons Ltd.)

In addition to high-molecular risk (HMR) mutations (ASXL1, EZH2, SRSF2, IDH, and U2AF1 Q157 ), lower JAK2V617F variant allele frequencies (VAF) have been demonstrated to be associated with poor prognosis of myelofibrosis (MF) patients. Nevertheless, the relationship between JAK2V617F VAF and HMR mutations remains inconclusive. To address this, we analyzed the mutation status of 54 myeloid neoplasm-relevant genes using targeted next-generation sequencing in 124 MF patients. Three cohorts from multiple international centers were analyzed for external validation. Among JAK2-mutated patients, the presence of HMR mutations drove poor prognosis in patients with lower JAK2V617F VAF but not in those with higher JAK2V617F VAF. Survival analyses showed consistent results across validation cohorts. In multivariable analysis, concurrent HMR and a lower JAK2V617F VAF was identified as an independent adverse prognostic factor for survival, irrespective of age, MIPSS70, MIPSS70 + v2, and GIPSS risk groups. Mutation co-occurrence tests revealed no shared mutational pattern over different cohorts, excluding potential confounding effect from other concurrent mutations. Importantly, the integration of HMR/JAK2V617F VAF (≤50%) status significantly enhanced existing prognostic models, as evidenced by higher c-indexes and time-dependent ROC analyses. Single-cell studies with sequential follow-ups are warranted to decipher the clonal evolution of MF and how it relates to JAK2V617F VAF dynamics., (© 2024. The Author(s), under exclusive licence to Springer Nature Limited.)

Myeloproliferative neoplasms (MPNs) are characterized by an increased production of blood cells due to the acquisition of mutations such as JAK2 V617F . TGF-β, whose secretion is increased in MPN patients, is known to negatively regulate haematopoietic stem cell (HSC) proliferation. Using an isogenic JAK2 V617F or JAK2 wild-type UT-7 cell line we observed that JAK2 V617F cells resist to TGF-β antiproliferative activity. Although TGF-β receptors and SMAD2/3 expressions are similar in both cell types, TGF-β-induced phosphorylation of SMAD2/3 is reduced in UT-7 JAK2 V617F cells compared with JAK2 WT cells. We confirmed that JAK2 V617F mutated cells are resistant to the antiproliferative effect of TGF-β in a competitive assay as we observed a positive selection of JAK2 V617F cells when exposed to TGF-β. Using cell lines, CD34-positive cells from MPN patients and bone marrow cells from JAK2 V617F knock-in mice we identified a down regulation of the SHP-1 phosphatase, which is required for the regulation of HSC quiescence by TGF-β. The transduction of SHP-1 cDNA (but not a phosphatase inactive cDNA) restores the antiproliferative effect of TGF-β in JAK2 V617F mutated cells. Finally, SC-1, a known agonist of SHP-1, antagonized the selection of JAK2 V617F mutated cells in the presence of TGF-β. In conclusion, we show a JAK2-dependent down regulation of SHP-1 in MPN patients' cells which is related to their resistance to the antiproliferative effect of TGF-β. This may participate in the clonal selection of cancer cells in MPNs., (© 2024 The Author(s). Journal of Cellular and Molecular Medicine published by Foundation for Cellular and Molecular Medicine and John Wiley & Sons Ltd.)

Background: Most patients with myelofibrosis develop ruxolitinib intolerance or disease that is relapsed or refractory, and survival rates after ruxolitinib discontinuation are poor. We aimed to evaluate the safety and efficacy of fedratinib versus best available therapy (BAT) in patients with myelofibrosis previously treated with ruxolitinib., Methods: FREEDOM2 was a multicentre, open-label, randomised, controlled, phase 3 trial in 86 clinics in 16 countries, in which patients aged at least 18 years with intermediate-2 or high-risk myelofibrosis that was relapsed or refractory or intolerant to ruxolitinib with Eastern Cooperative Oncology Group performance status 0-2 were stratified by spleen size by palpation, platelet count, and previous ruxolitinib treatment, and randomly assigned 2:1 by interactive response technology to receive fedratinib 400 mg per day (4 × 100 mg capsules orally once daily, open-label) or BAT. Patients received prophylactic antiemetics and thiamine supplementation, and symptomatic antidiarrhoeals as required. Primary endpoint was proportion of patients reaching spleen volume reduction (SVR) of at least 35% (SVR35) at end of cycle 6 in the intention-to-treat population. This manuscript reports the primary analysis of the trial; follow-up is ongoing. This trial is registered at clinicaltrials.gov, NCT03952039., Findings: Between Sept 9, 2019 and June 24, 2022, of 316 patients screened, 201 were randomly assigned and treated (134 to fedratinib, 67 to BAT [including 52 receiving ruxolitinib]); 46 patients from the BAT group crossed over to fedratinib. Approximately half of enrolled patients were male (fedratinib 75 [56%] of 134; BAT 30 [45%] of 67) and most were White (fedratinib 106 [79%] of 134; BAT 58 [87%] of 67). At data cutoff (Dec 27, 2022), median survival follow-up was 64·5 weeks (IQR 37·9-104·9). SVR35 at end of cycle 6 was seen in 48 (36%) of 134 patients receiving fedratinib versus four (6%) of 67 patients receiving BAT (30% difference; 95% CI 20-39; one-sided p-value <0·0001). During the first six cycles 53 (40%) of 134 patients in the fedratinib group and 8 (12%) of 67 patients in the BAT group had grade 3 or greater treatment-related adverse events, most frequently anaemia (fedratinib 12 [9%] of 134; BAT 6 [9%] of 67) and thrombocytopenia (fedratinib 16 [12%] of 134; BAT 2 [3%] of 67); one patient in the fedratinib group died from acute kidney injury suspected to be related to study drug (no treatment-related deaths in the BAT group). Gastrointestinal adverse events occurred more frequently in the fedratinib group compared with the BAT group, but were mostly grade 1-2 in severity and more frequent in early cycles, and were less frequent than in prior clinical trials. A total of 28 (21%) of 134 patients in the fedratinib group and 3 (4%) of 67 patients in the BAT group had thiamine levels below lower limit of normal per central laboratory assessment, with only one case of low thiamine in the fedratinib arm after the introduction of prophylactic thiamine supplementation., Interpretation: Findings from FREEDOM2 support fedratinib as a second-line Janus kinase inhibitor option to reduce spleen size after ruxolitinib failure or intolerance in patients with myelofibrosis, and shows effective strategies for management of gastrointestinal adverse events and low thiamine concentrations through prophylaxis, monitoring, and treatment., Funding: Bristol Myers Squibb., Competing Interests: Declaration of interests CNH reports research funding from Bristol Myers Squibb, Constellation–Morphosys, and Novartis; consulting fees from Galecto, Geron, and GlaxoSmithKline; honoraria from AbbVie, AOP Health, Bristol Myers Squibb–Celgene, CTI BioPharma, Galacteo, Geron, Gilead, IMAGO, Janssen, Keros, Novartis, Promedior, Roche, Shire, and Sierra; participation on a data safety monitoring board or advisory board with Galacteo and Keros; and leadership at the European Hematology Association. RM reports honoraria from AbbVie, Blueprint, Bristol Myers Squibb, CTI BioPharma, Genentech, Geron, GlaxoSmithKline, Incyte, Morphosys, Novartis, Sierra Oncology, and Telios. MT reports research funding from Bristol Myers Squibb; travel support from Sumitomo; participation on a data safety monitoring board or advisory board with Bristol Myers Squibb, Novartis, and Sumitomo; and leadership in the Society of Hematologic Oncology. HKA-A reports research funding from Bristol Myers Squibb, Incyte, and Novartis; travel support from AbbVie and Bristol Myers Squibb; and participation on a data safety monitoring board or advisory board with AbbVie, AOP Health, Blueprint, Bristol Myers Squibb, Novartis, and SGK. FPas reports research funding from Bristol Myers Squibb–Celgene; consulting fees from AbbVie, AOP Health, Bristol Myers Squibb–Celgene, Kartos, Karyopharma, Kyowa Kirin–MEI, Novartis, Roche, Sierra Oncology, and Sumitomo; and honoraria from AbbVie, AOP Health, Bristol Myers Squibb–Celgene, Novartis, and Roche. FPal reports research funding from Bristol Myers Squibb; honoraria from AbbVie, Amgen, AOP Health, Bristol Myers Squibb, CTI BioPharma, GlaxoSmithKline, Kartos, Novartis, and Telios; travel support from AbbVie and Novartis; and participation on a data safety monitoring board or advisory board with AbbVie, AOP Health, Bristol Myers Squibb, CTI BioPharma, GlaxoSmithKline, and Novartis. GB reports honoraria and participation on a data safety monitoring board or advisory board with Bristol Myers Squibb, Janssen, and Novartis. AMV reports honoraria from AbbVie, Bristol Myers Squibb, Geron, GlaxoSmithKline, Incyte, and Novartis; and participation on a data safety monitoring board or advisory board with Bristol Myers Squibb, Geron, Incyte, and Novartis. CM reports research funding from AbbVie and Bristol Myers Squibb; and honoraria from AbbVie, Bristol Myers Squibb, and Novartis. AI reports honoraria from Bristol Myers Squibb, GlaxoSmithKline, Incyte, Novartis, and Pfizer; and participation on a data safety monitoring board or advisory board with AOP Health, Bristol Myers Squibb, Incyte, Novartis, and Pfizer. PB reports employment and stock or stock options with Bristol Myers Squibb. CH reports employment with Bristol Myers Squibb. SR reports employment and stock or stock options with Bristol Myers Squibb. JW reports employment with Bristol Myers Squibb. J-JK reports consulting fees from AbbVie and GlaxoSmithKline; honoraria from AOP Health and Novartis; and participation on a data safety monitoring board or advisory board with Bristol Myers Squibb and Incyte. BX and IK report no competing interests., (Copyright © 2024 Elsevier Ltd. All rights reserved, including those for text and data mining, AI training, and similar technologies.)

Abstract: The ACE-536-MF-001 trial enrolled patients with myelofibrosis (n = 95) into 4 cohorts: patients in cohorts 1 and 3A were non-transfusion dependent (NTD) and had anemia; patients in cohorts 2 and 3B were transfusion dependent (TD); and patients in cohort 3A/3B had stable ruxolitinib treatment before and during the study. All patients received luspatercept (1.0-1.75 mg/kg, 21-day cycles). Treatment was extended if clinical benefit was observed at day 169. The primary end point was anemia response rate (NTD, ≥1.5 g/dL hemoglobin increase from baseline; TD, transfusion-independence) over any 12-week period during the primary treatment period (weeks 1-24). Overall, 14% of patients in cohorts 1 and 3A, 10% in cohort 2, and 26% in cohort 3B met the primary end point. In cohorts 1 and 3A (NTD), 27% and 50% of patients, respectively, had mean hemoglobin increase of ≥1.5 g/dL from baseline. Among TD patients, ∼50% had ≥50% reduction in transfusion burden. Reduction in total symptom score was observed in all cohorts, with the greatest response rate seen in cohort 3A. Overall, 94% of patients had ≥1 adverse event (AE); 47% had ≥1 treatment-related AE (TRAE; 11% grade ≥3), most frequently hypertension (18%), managed with medical intervention. One patient had a serious TRAE leading to luspatercept discontinuation. Nine patients died on treatment (unrelated to study drug). In most patients, ruxolitinib dose and spleen size remained stable. In patients with myelofibrosis, luspatercept improved anemia and transfusion burden across cohorts; the safety profile was consistent with previous studies. This trial was registered at www.ClinicalTrials.gov as #NCT03194542., (© 2024 by The American Society of Hematology. Licensed under Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0), permitting only noncommercial, nonderivative use with attribution. All other rights reserved.)

The main objectives of multidisciplinary clinical investigation center (CIC-P) are to facilitate the availability of new drugs for patients, to enhance the visibility and attractiveness of French clinical research, to improve the quality of early phase trials, and to enhance the value of academic research by evaluating molecules in rare diseases. Since 2017, the CIC-P has been committed to a quality approach process, launching in 2018 its first satisfaction survey on patient care and clinical trial management of all its employees. A second satisfaction survey targeted by profession type was to be launched in 2020, in view of the requirements of the ISO 9001:2015 standard, but the process was interrupted following the coronavirus diseases 2019 (COVID-19) pandemic. The successful reorganization of the CIC-P activity during the first containment of the COVID-19 pandemic was driven by the implementation of a quality management system that promotes continuous improvement through the organization and involvement of all the staff. This voluntary and participative approach motivated the CIC-P to apply for the organizational sesame. The ISO 9001:2015 certification of CIC-P aims at increasing its performance, to satisfying its customers and to fully integrate its activities in a continuous improvement process, according to the requirements of this international standard, through the deployment of quality tools such as The Deming wheel (PDCA), an indispensable tool for transformation and reorganization; the analysis of the environment by the strengths, weakness, opportunities, threats (SWOT) analysis tool; the analysis and management of risks by the FMEA method, and all with performance indicators (SMART) and precise objectives at each stage of a project/process. The implementation of satisfaction questionnaires remains the essential tool for evaluating the expectations and needs of interested parties, but also for improving the quality of CIC-P activities and services. All these tools put in place have allowed us to continuously improve the means of production and to constantly improve our organization., (Copyright © 2024 The Author(s). Published by Elsevier Masson SAS.. All rights reserved.)

The phase 3b FREEDOM trial (ClinicalTrials.gov: NCT03755518) evaluates efficacy/safety of fedratinib in intermediate- or high-risk myelofibrosis patients with platelet count ≥50 × 10 9 /L, previously treated with ruxolitinib. The trial design included protocol specified strategies to mitigate the risk for gastrointestinal (GI) adverse events (AEs), thiamine supplementation, and encephalopathy surveillance. Due to COVID-19, accrual was cut short with 38 patients enrolled. In the efficacy evaluable population ( n  = 35), nine (25.7%; 95% confidence interval 12.5-43.3) patients achieved primary endpoint of ≥35% spleen volume reduction (SVR) at end of cycle (EOC) 6; and 22 (62.9%) patients showed best overall response of ≥35% SVR up to end of treatment. Sixteen (44.4%) patients showed ≥50% reduction in total symptom score at EOC6 ( n  = 36). Compared to previously reported JAKARTA-2 trial, rates of GI AEs were lower, and no patient developed encephalopathy. Overall, FREEDOM study showed clinically relevant spleen and symptom responses with fedratinib, and effective mitigation of GI AEs.

Objectives: COVID-19 vaccine breakthrough infections were frequently reported during circulation of the Omicron variant. The ANRS|MIE CoviCompareP study investigated these infections in adults vaccinated and boosted with BNT162b2 [Pfizer-BioNTech] and with/without SARS-CoV-2 infection before vaccination., Methods: In the first half of 2021, healthy adults (aged 18-45, 65-74 and 75 or older) received either one dose of BNT162b2 (n = 120) if they had a documented history of SARS-CoV-2 infection at least five months previously, or two doses (n = 147) if they had no history confirmed by negative serological tests. A first booster dose was administered at least 6 months after the primary vaccination, and a second booster dose, if any, was reported in the database. Neutralizing antibodies (NAbs) against the European (D614G) strain and the Omicron BA.1 variant were assessed up to 28 days after the first booster dose. A case-control analysis was performed for the 252 participants who were followed up in 2022, during the Omicron waves., Results: From January to October 2022, 78/252 (31%) had a documented symptomatic breakthrough infection after full vaccination: 21/117 (18%) in those who had been infected before vaccination vs. 57/135 (42%) in those who had not. In a multivariate logistic regression model, factors associated with a lower risk of breakthrough infection were older age, a higher number of booster doses, and higher levels of Omicron BA.1 NAb titers in adults with infection before vaccination, but not in those without prior infection., Conclusion: Our results highlight the need to consider immune markers of protection in association with infection and vaccination history., Competing Interests: Declaration of Competing Interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2024 The Author(s). Published by Elsevier Masson SAS.. All rights reserved.)

Interferon-based therapies, such as ropeginterferon alfa-2b have emerged as promising disease-modifying agents for myeloproliferative neoplasms (MPNs), including essential thrombocythemia (ET). Current ET treatments aim to normalize hematological parameters and reduce the thrombotic risk, but they do not modify the natural history of the disease and hence, have no impact on disease progression. Ropeginterferon alfa-2b (trade name BESREMi®), a novel, monopegylated interferon alfa-2b with an extended administration interval, has demonstrated a robust and sustained efficacy in polycythemia vera (PV) patients. Given the similarities in disease pathophysiology and treatment goals, ropeginterferon alfa-2b holds promise as a treatment option for ET. The ROP-ET trial is a prospective, multicenter, single-arm phase III study that includes patients with ET who are intolerant or resistant to, and/or are ineligible for current therapies, such as hydroxyurea (HU), anagrelide (ANA), busulfan (BUS) and pipobroman, leaving these patients with limited treatment options. The primary endpoint is a composite response of hematologic parameters and disease-related symptoms, according to modified European LeukemiaNet (ELN) criteria. Secondary endpoints include improvements in symptoms and quality of life, molecular response and the safety profile of ropeginterferon alfa-2b. Over a 3-year period the trial assesses longer term outcomes, particularly the effects on allele burden and clinical outcomes, such as disease-related symptoms, vascular events and disease progression. No prospective clinical trial data exist for ropeginterferon alfa-2b in the planned ET study population and this study will provide new findings that may contribute to advancing the treatment landscape for ET patients with limited alternatives. TRIAL REGISTRATION: EU Clinical Trials Register; EudraCT, 2023-505160-12-00; Registered on October 30, 2023., (© 2024. The Author(s).)

Myeloproliferative neoplasms (MPN) are characterized by a clonal proliferation of myeloid lineage cells within the bone marrow. The classical BCR-ABL negative MPNs are comprised of polycythaemia vera, essential thrombocythaemia and primary myelofibrosis. Historically, the majority of MPNs are diagnosed in adults older than 60 years of age; however, in recent years, there has been recognition of MPNs in the adolescent and young adult (AYA) population. AYAs with MPN, typically defined as between the ages of 15 and 39 years old, may comprise up to 20% of patients diagnosed with MPN. They demonstrate unique patterns of driver mutations and thrombotic events and remain at risk for progression to more aggressive disease states. Given the likely long length of time they will live with their disease, there is a significant unmet need in identifying well-tolerated and effective treatment options for these patients, particularly with the advent of disease modification. In this review, we provide a comprehensive overview of the clinical features, disease course and management of AYA patients with MPN and, in doing so, highlight key characteristics that distinguish them from their older counterparts., (© 2024 British Society for Haematology and John Wiley & Sons Ltd.)

The current standard-of-care for treatment of myelofibrosis (MF) comprises inhibitors of the Janus kinase (JAK)/signal transducers and activators (STAT) pathway; however, despite their ability to alleviate symptoms, they do not appear to modify underlying disease and have not demonstrated substantial survival benefit. Allogeneic-hematopoietic stem cell transplantation remains the only curative option for patients with MF but is limited to a subset of high-risk and fit patients. Early disease modification could positively affect disease trajectory for lower risk patients with MF as well as those with conditions that can precede MF, such as polycythemia vera and essential thrombocythemia. Here, the authors discuss critical unmet needs in the MF treatment paradigm, including: the need for safe, impactful therapies for lower risk patients, thus allowing intervention when success is most likely; better development of first-line therapies (likely highly novel or combination strategies) for intermediate-risk/higher risk patients; and approved drugs to manage cytopenia. Finally, a consensus definition of disease modification is needed that informs trial design, allowing the development of clinical end points that enable understanding of therapies and responses and that facilitate the development of therapies that work according to this definition. Through close collaboration between clinicians, patients, and the pharmaceutical industry, better efforts to define benefit and identify patients most likely to benefit from a particular combination or treatment strategy should enable the development of more effective and safe treatments to extend and improve quality of life for patients with MF., (© 2024 The Authors. Cancer published by Wiley Periodicals LLC on behalf of American Cancer Society.)

Objectives: Patients with myelofibrosis develop symptoms due to bone marrow fibrosis, systemic inflammation, and/or organomegaly. Alleviating symptoms improves overall quality of life. Clinical trials have historically defined symptom response as a reduction of at least 50% in Total Symptom Score at week 24 compared with baseline. Whether 50% constitutes a meaningful benefit has not been established. This study determined the meaningful change threshold (MCT) for 2 momelotinib phase III trials, SIMPLIFY-1 and SIMPLIFY-2., Methods: The absolute and percentage MCT was determined using anchor-based methods applied to the modified Myeloproliferative Neoplasm Symptom Assessment Form v2.0 and Patient Global Impression of Change. MCTs were applied retrospectively to determine responder rates. Generalized estimating equations estimated the treatment-related difference in likelihood of improvement., Results: In SIMPLIFY-1, a Janus kinase inhibitor-naive population, the MCT was 8 points. In SIMPLIFY-2, a previously Janus kinase inhibitor-treated population, the MCT was 6 points. A 32% MCT was determined in both studies, showing that the historic 50% reduction threshold may be a conservative choice. In SIMPLIFY-1, a similar proportion of patients achieved responder status with 24 weeks of momelotinib or ruxolitinib therapy based on the absolute MCT (39% vs 41%, respectively). In SIMPLIFY-2, a significantly greater proportion of patients treated with momelotinib achieved responder states compared with best available therapy based on absolute and percent change MCTs., Conclusions: This study demonstrates that momelotinib provided clinically meaningful symptom benefit for patients with myelofibrosis and provides insight into the appropriateness of the symptom change threshold used in historical studies., Competing Interests: Author Disclosures Author disclosure forms can be accessed in the Supplemental Material section., (Copyright © 2024. Published by Elsevier Inc.)

Importance: There is still considerable controversy in the literature regarding the capacity of intramuscular messenger RNA (mRNA) vaccination to induce a mucosal immune response., Objective: To compare serum and salivary IgG and IgA levels among mRNA-vaccinated individuals with or without previous SARS-CoV-2 infection., Design, Setting, and Participants: In this cohort study, SARS-CoV-2-naive participants and those with previous infection were consecutively included in the CoviCompare P and CoviCompare M mRNA vaccination trials and followed up to day 180 after vaccination with either the BNT162b2 (Pfizer-BioNTech) vaccine or the mRNA-1273 (Moderna) vaccine at the beginning of the COVID-19 vaccination campaign (from February 19 to June 8, 2021) in France. Data were analyzed from October 25, 2022, to July 13, 2023., Main Outcomes and Measures: An ultrasensitive digital enzyme-linked immunosorbent assay was used for the comparison of SARS-CoV-2 spike-specific serum and salivary IgG and IgA levels. Spike-specific secretory IgA level was also quantified at selected times., Results: A total of 427 individuals were included in 3 groups: participants with SARS-CoV-2 prior to vaccination who received 1 single dose of BNT162b2 (Pfizer-BioNTech) (n = 120) and SARS-CoV-2-naive individuals who received 2 doses of mRNA-1273 (Moderna) (n = 172) or 2 doses of BNT162b2 (Pfizer-BioNTech) (n = 135). The median age was 68 (IQR, 39-75) years, and 228 (53.4%) were men. SARS-CoV-2 spike-specific IgG saliva levels increased after 1 or 2 vaccine injections in individuals with previous infection and SARS-CoV-2-naive individuals. After vaccination, SARS-CoV-2-specific saliva IgA levels, normalized with respect to total IgA levels, were significantly higher in participants with previous infection, as compared with the most responsive mRNA-1273 (Moderna) recipients (median normalized levels, 155 × 10-5 vs 37 × 10-5 at day 29; 107 × 10-5 vs 54 × 10-5 at day 57; and 104 × 10-5 vs 70 × 10-5 at day 180 [P < .001]). In contrast, compared with day 1, spike-specific IgA levels in the BNT162b2-vaccinated SARS-CoV-2-naive group increased only at day 57 (36 × 10-5 vs 49 × 10-5 [P = .01]). Bona fide multimeric secretory IgA levels were significantly higher in individuals with previous infection compared with SARS-CoV-2-naive individuals after 2 antigenic stimulations (median optical density, 0.36 [IQR, 0.16-0.63] vs 0.16 [IQR, 0.10-0.22]; P < .001)., Conclusions and Relevance: The findings of this cohort study suggest that mRNA vaccination was associated with mucosal immunity in individuals without prior SARS-CoV-2 infection, but at much lower levels than in previously infected individuals. Further studies are needed to determine the association between specific saliva IgA levels and prevention of infection or transmission.

Bone marrow fibrosis (BMF) is a pathological feature of myelofibrosis, with higher grades associated with poor prognosis. Limited data exist on the association between outcomes and BMF changes. We present BMF data from Janus kinase (JAK) inhibitor-naive patients from SIMPLIFY-1 (NCT01969838), a double-blind, randomized, phase 3 study of momelotinib vs ruxolitinib. Baseline and week 24 bone marrow biopsies were graded from 0 to 3 as per World Health Organization criteria. Other assessments included Total Symptom Score, spleen volume, transfusion independence status, and hemoglobin levels. Paired samples were available from 144 and 160 patients randomized to momelotinib and ruxolitinib. With momelotinib and ruxolitinib, transfusion independence was achieved by 87% and 44% of patients with BMF improvement of ≥1 grade and 76% and 56% of those with stable/worsening BMF; there was no association between BMF changes and transfusion independence for either arm (momelotinib, p  = .350; ruxolitinib, p  = .096). Regardless of BMF changes, hemoglobin levels also generally increased on momelotinib but decreased on ruxolitinib. In addition, no associations between BMF changes and spleen (momelotinib, p  = .126; ruxolitinib, p  = .407)/symptom (momelotinib, p  = .617; ruxolitinib, p  = .833) outcomes were noted, and no improvement in overall survival was observed with ≥1-grade BMF improvement (momelotinib, p  = .395; ruxolitinib, p  = .407). These data suggest that the anemia benefit of momelotinib is not linked to BMF changes, and question the use of BMF assessment as a surrogate marker for clinical benefit with JAK inhibitors., Competing Interests: Stephen T. Oh reports consulting fees from AbbVie, Blueprint Medicines, Bristol Myers Squibb/Celgene, Constellation Pharmaceuticals, CTI BioPharma, Disc Medicine, Incyte, Kartos Therapeutics, PharmaEssentia, and Sierra Oncology. Srdan Verstovsek reports consulting fees from Bristol Myers Squibb/Celgene, Incyte, Novartis, and Sierra Oncology and research funding from AstraZeneca, Blueprint Medicines, Bristol Myers Squibb/Celgene, CTI BioPharma, Genentech, Gilead, Incyte, Italfarmaco, Novartis, NS Pharma, PharmaEssentia, and Promedior. Vikas Gupta reports consulting fees from AbbVie, Bristol Myers Squibb/Celgene, Constellation Biopharma, Novartis, Pfizer, and Sierra Oncology; honoraria from Bristol Myers Squibb/Celgene, Constellation Biopharma, and Novartis; and participation on a data safety monitoring board or advisory board for AbbVie, Bristol Myers Squibb/Celgene, Pfizer, and Roche. Uwe Platzbecker reports consulting fees from AbbVie, Bristol Myers Squibb/Celgene, Janssen, and Novartis; honoraria from Amgen, Jazz Pharmaceuticals, and Takeda; and participation on a data safety monitoring board or advisor board for AbbVie and Novartis. Timothy Devos reports consulting fees from AOP Health, Bristol Myers Squibb/Celgene, Incyte, and MorphoSys and honoraria from Novartis and Sobi. Jean‐Jacques Kiladjian reports honoraria from Novartis and participation on a data safety monitoring board or advisory board for AbbVie, AOP Orphan, Bristol Myers Squibb, Incyte, and Novartis. Donal P. McLornan reports grants or contracts from CPI and honoraria from AbbVie, Bristol Myers Squibb/Celgene, Jazz Pharmaceuticals, and Novartis. Andrew Perkins reports honoraria from AbbVie, Novartis, CTI BioPharma, Sierra Oncology, and Kartos Therapeutics. Maria Laura Fox reports consulting fees from AbbVie, GSK, Novartis, and Sierra Oncology; payment or honoraria from Bristol Myers Squibb and Novartis; and travel support from AbbVie. Mary Frances McMullin reports consulting fees from AbbVie, Bristol Myers Squibb, CTI, Novartis, and Sierra Oncology and honoraria from AbbVie, AOP, Incyte, Novartis, and Pfizer. Adam J. Mead reports consulting fees from AbbVie, Bristol Myers Squibb/Celgene, Galecto, Gilead, Incyte, Karyopharm, Novartis, Pfizer, Sensyn, and Sierra Oncology; travel fees from Bristol Myers Squibb/Celgene; and participation on a data safety monitoring board or advisory board for Bristol Myers Squibb/Celgene. Jiri Mayer reports research support from Sierra Oncology. Tomasz Sacha reports honoraria from Angelini Pharma, Bristol Myers Squibb/Celgene, Novartis, Pfizer, and Roche. Jun Kawashima reports employment at Sierra Oncology and stock or stock options at Gilead Sciences and Sierra Oncology. Mei Huang reports employment and stock options at Sierra Oncology. Bryan Strouse reports employment at Sierra Oncology. Ruben Mesa reports grants or contracts from AbbVie, Celgene, CTI Biopharma, Constellation Biopharma, Genotech, Incyte, Promedior, Samus Therapeutics, and the Mays Cancer Center P30 Cancer Center Support Grant from the National Cancer Institute (CA054174) and consulting fees from Constellation Biopharma, La Jolla, Novartis, and Sierra Oncology. Miklos Egyed declares no conflict of interest., (© 2024 The Authors. eJHaem published by British Society for Haematology and John Wiley & Sons Ltd.)

Current recommended risk scores to predict thrombotic events associated with myeloproliferative neoplasms (MPN) do not discriminate between arterial and venous thrombosis despite their different physiopathology. To define novel stratification systems, we delineated a comprehensive landscape of MPN associated thrombosis across a large long-term follow-up MPN cohort. Prior arterial thrombosis, age >60 years, cardiovascular risk factors and presence of TET2 or DNMT3A mutations were independently associated with arterial thrombosis in multivariable analysis. ARTS, an ARterial Thrombosis Score, based on these four factors, defined low- (0.37% patients-year) and high-risk (1.19% patients-year) patients. ARTS performance was superior to the two-tiered conventional risk stratification in our training cohort, across all MPN subtypes, as well as in two external validation cohorts. Prior venous thrombosis and presence of a JAK2 V617F mutation with a variant allelic frequency ≥50% were independently associated with venous thrombosis. The discrimination potential of VETS, a VEnous Thrombosis Score based on these two factors, was poor, similar to the two-tiered conventional risk stratification. Our study pinpoints arterial and venous thrombosis clinico-molecular differences and proposes an arterial risk score for more accurate patients' stratification. Further improvement of venous risk scores, accounting for additional factors and considering venous thrombosis as a heterogeneous entity is warranted., (© 2023. The Author(s), under exclusive licence to Springer Nature Limited.)

Classical myeloproliferative neoplasms (MPNs) are characterized by the proliferation of myeloid cells and the risk of transformation into myelofibrosis or acute myeloid leukemia (AML) and TP53 mutations in MPN patients are linked to AML. However, JAK2V617F has been reported to impact the TP53 response to DNA damage, suggesting potential overlapping role of TP53 inactivation in MPN. We established a mouse model showing that JAK2V617F/Vav-Cre/Trp53 -/- mice displayed a similar phenotype to JAK2V617F/Vav-Cre mice, but their proliferation was outcompeted in competitive grafts. RNA-Seq revealed that half of the genes affected by JAK2V617F were affected by p53-inactivation, including the interferon pathway. To validate this finding, mice were repopulated with a mixture of wild-type and JAK2V617F (or JAK2V617F/Vav-Cre/Trp53 -/- ) cells and treated with pegylated interferonα. JAK2V617F-reconstituted mice entered complete hematological remission, while JAK2V617F/Vav-Cre /Trp53 -/- -reconstituted mice did not, confirming that p53 loss induced interferon-α resistance. KEGG and Gene Ontology analyses of common deregulated genes showed that these genes were mainly implicated in cytokine response, proliferation, and leukemia evolution, illustrating that in this mouse model, the development of MPN is not affected by TP53 inactivation. Taken together, our results show that many genetic modifications induced by JAK2V617F are influenced by TP53, the MPN phenotype may not be. Trp53 loss alone is insufficient to induce rapid leukemic transformation in steady-state hematopoiesis in JAK2V617F MPN, and Trp53 loss may contribute to interferon resistance in MPN., (© 2023. The Author(s).)

Background: We investigated naporafenib (LXH254), a pan-RAF kinase inhibitor, with or without spartalizumab, in patients with advanced solid tumors harboring MAPK pathway alterations., Methods: This first-in-human phase 1 study had two dose-escalation arms: single-agent naporafenib (starting at 100 mg once-daily [QD]) and naporafenib (starting at the recommended dose/regimen)/spartalizumab (400 mg every 4 weeks). The naporafenib/spartalizumab dose-expansion part enrolled patients with KRAS-mutated non-small cell lung cancer (NSCLC) and NRAS-mutated melanoma. The primary objectives were to establish the maximum tolerated doses (MTD)/recommended doses for expansion (RDE) and evaluate tolerability and safety., Results: A total of 142 patients were included in the naporafenib dose-escalation (n = 87), naporafenib/spartalizumab dose-escalation (n = 12) and naporafenib/spartalizumab dose-expansion (n = 43) arms. The MTD/RDE of naporafenib was 600 mg twice-daily (BID). In naporafenib escalation, five patients experienced 7 dose-limiting toxicities: decreased platelet count (1200 mg QD); neuralgia, maculopapular rash, pruritus (600 mg BID); increased blood bilirubin, hyponatremia, peripheral sensory neuropathy (800 mg BID). No DLTs occurred in the naporafenib/spartalizumab arm: the RDE was established at 400 mg BID. The most common treatment-related adverse events were rash and dermatitis acneiform (each 24.1%; naporafenib), nausea and pruritus (each 33.3%; naporafenib/spartalizumab; escalation) and rash (39.5%; naporafenib/spartalizumab; expansion). Naporafenib reduced DUSP6 expression in tumors. Two partial responses (PRs) occurred in naporafenib escalation, and 1 complete response and 3 PRs in the naporafenib/spartalizumab NRAS-mutated melanoma and KRAS-mutated NSCLC arms, respectively., Conclusions: Naporafenib, with or without spartalizumab, showed an acceptable safety profile, pharmacodynamic activity and limited antitumor activity. Additional naporafenib combination therapies are currently under investigation., Competing Interests: Declaration of Competing Interest The authors declare the following financial interests/personal relationships which may be considered as potential competing interests: Filip Janku received research support from Astex, Novartis, BioMed Valley Discoveries, Fore Bio, Deciphera, Bristol-Myers Squibb, Asana, Ideaya Biosciences, Sanofi, Merck, F-star, JSI Innopharm, Bioxcel, Lilly, Bicara, PureTech Health, FujiFilm Pharmaceuticals, Piqur, Sotio, Synlogic, NextCure and Hutchinson Medipharma; served on the Scientific Advisory Boards of Ideaya Biosciences, Synlogic, Sotio, Puretech Health, Deciphera, Crown Bioscience, Asana, Fore Bio, Novartis, Bicara and PegaOne; served as a paid consultant for Mersana Therapeutics, Flame Bio, Cardiff Oncology, MedinCell and Immunomet; has ownership interests in Cardiff Oncology and Monte Rosa Therapeutics; and has the leadership position in Monte Rosa Therapeutics. Tae Min Kim received consulting fees or honoraria for lectures from AstraZeneca, IMBDx, Inc., Janssen, Regeneron, Samsung Bioepis, Takeda and Yuhan; had advisory role for AstraZeneca, Janssen, Regeneron and Takeda; and received a research grant from AstraZeneca-KHIDI outside this work. Gopakumar Iyer reports consulting or advisory role for Bayer, Janssen, Mirati Therapeutics, Basilea Pharmaceutica, Flare Therapeutics and Aadi Bioscience; speakers' bureau for Gilead Sciences and Lynx Group; and research funding (to institution) from Mirati Therapeutics, Novartis, Janssen, Seattle Genetics, LOXO at Lilly and Aadi Bioscience. Anna Spreafico has received consulting fees from Merck, Bristol-Myers Squibb, Oncorus, Janssen, and Medison & Immunocore; and funding support for clinical trials paid to the Institution from Novartis, Bristol-Myers Squibb, Symphogen, AstraZeneca/Medimmune, Merck, Bayer, Surface Oncology, Northern Biologics, Janssen Oncology/Johnson & Johnson, Roche, Regeneron, Alkermes, Array Biopharma/Pfizer, GSK, NuBiyota, Oncorus, Treadwell and Amgen. Elena Elez has received personal speaker honoraria from Organon and Novartis; and personal advisory board honoraria from Amgen, Bayer, Hoffman-La Roche, Merck Serono, Sanofi, Pierre Fabre, MSD and Servier. Noboru Yamamoto reports research grants from Astellas, Chugai, Eisai, Taiho, BMS, Pfizer, Novartis, Eli Lilly, AbbVie, Daiichi-Sankyo, Bayer, Boehringer Ingelheim, Kyowa Kirin, Takeda, ONO, Janssen Pharma, MSD, Merck, GSK, Sumitomo Pharma, Chiome Bioscience, Otsuka, Carna Biosciences, Genmab, Shionogi, TORAY, KAKEN, AstraZeneca, Cmic, InventisBio and Rakuten Medical; advisory roles for Eisai, Takeda, Boehringer Ingelheim, Cmic, Chugai, Merck and Healios; and honoraria as a Speaker from ONO, Chugai, Daiichi-Sankyo and Eisai. Anthonie J. van der Wekken reports grants and other support from AstraZeneca, Pfizer, Roche and Takeda; grants from Boehringer Ingelheim; and other support from Agena and Janssen, outside the submitted work. All payments were made to the University Medical Centre Groningen. Paolo Antonio Ascierto has/had a consultant/advisory role for Bristol Myers Squibb, Roche-Genentech, Merck Sharp & Dohme, Novartis, Merck Serono, Pierre-Fabre, AstraZeneca, Sun Pharma, Sanofi, Sandoz, Immunocore, Italfarmaco, Nektar, Boehringer-Ingelheim, Eisai, Regeneron, Daiichi Sankyo, Pfizer, Oncosec, Nouscom, Lunaphore, Seagen, iTeos, Medicenna, Bio-Al Health, ValoTX, Replimmune, Bayer and Erasca; received research funding from Bristol Myers Squibb, Roche-Genentech, Pfizer and Sanofi; and travel support from Pfizer, Bio-Al Health and Replimmune. Frederik Marmé reports personal fees from GSK, Roche, Novartis, AstraZeneca, MSD, Vaccibody, Gilead Sciences, Eisai, Pfizer, Myriad, Genomic Health, Seagen, Daiichi Sankyo, Pierre Fabre, Agendia, Lilly and Clovis outside the submitted work. Jean-Jacques Kiladjian reports consulting fees from GSK and Abbvie; payment or honoraria for lectures, presentations, speakers’ bureaus, manuscript writing or educational events from Novartis and AOP Health; participation on a data safety monitoring board or advisory board for Incyte and BMS. Sumit Basu, Fabienne Baffert, Amparo Buigues, Vesselina Cooke and Jaeyeon Kim are employees and stockholders of Novartis. Chi Chen and Elisa Giorgetti are employees of Novartis. Fiona McCarthy is a previous employee and a stockholder of Novartis. Michele Moschetta is a previous employee and a stockholder of Novartis and has submitted a patent application related to LXH254. Reinhard Dummer reports intermittent, project-focused consulting and/or advisory relationships with Novartis, Merck Sharp & Dhome (MSD), Bristol-Myers Squibb (BMS), Roche, Amgen, Takeda, Pierre Fabre, Sun Pharma, Sanofi, Catalym, Second Genome, Regeneron, Alligator, T3 Pharma, MaxiVAX SA, Pfizer and touchIME outside the submitted work. Maja de Jonge and Michela Maur report no conflicts of interest., (Copyright © 2023 Elsevier Ltd. All rights reserved.)