What is already known about this topic? A phase III study demonstrated that compared with placebo, 4-weekly add-on mepolizumab (300 mg subcutaneously) reduced flares in patients with uncontrolled FIP1-like-1-platelet-derived growth factor receptor a (FIP1L1-PDGFRA)-negative hypereosinophilic syndrome (HES), with a positive benefiterisk profile.What does this article add to our knowledge? This open-label extension study found no new safety signals with mepolizumab treatment in patients with FIP1L1-PDGFRA-negative HES. Moreover, mepolizumab continued to control flares and blood eosinophil counts after 52 weeks of continuous treatment.How does this study impact current management guidelines? Findings from this open-label extension study provide further evidence that patients with FIP1L1-PDGFRA-negative HES are likely to benefit from treatment with mepolizumab and may be able to reduce oral corticosteroid use.BACKGROUND: A double-blind, placebo-controlled, phase III study (200622) showed that mepolizumab reduces disease flares for patients with uncontrolled FIP1-like-1-platelet-derived growth factor receptor aenegative hypereosinophilic syndrome (HES) and two or more flares in the previous year. OBJECTIVE: To further characterize the safety, clinical benefit, and pharmacodynamics of mepolizumab. METHODS: Eligible patients from both treatment arms of the double-blind study could enter an open-label extension study (205203; NCT03306043) to receive 4-weekly mepolizumab (300 mg subcutaneously) plus background therapy for 20 weeks. Primary end points were safety-based; other end points included flare rates and changes from baseline in mean daily oral corticosteroid (OCS) dose and blood eosinophil count. RESULTS: Of 104 patients who completed the double-blind study, 98% (previous placebo, n [ 52; previous mepolizumab, n [ 50) enrolled in the open-label extension. Overall, 66 of patients reported adverse events (AEs) (65%), 15 reported

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Myeloproliferative disease associated with FGFR1 rearrangement (8p11), which is included in the 2008 WHO Classification of Myeloid Neoplasms, is a rare and extremely aggressive abnormality. The paper describes a clinical case of a 39-year-old female patient who was detected to have leukocytosis (as high as 47.2·109/l), absolute eosinophilia (as high as 3.1·109/l), and enlarged peripheral lymph nodes during her visit to a doctor. The bone marrow (BM) showed the changes typically encountered in myeloproliferative disease with eosinophilia. The patient was found to have t(8;13)(p11;q12) translocation associated with the rearrangement of the FGFR1 gene located at the 8p11 locus. Molecular and cytogenetic examinations failed to reveal BCR-ABL chimeric transcript, Jak2 V617F mutation, and deletions and translocations involving PDGFRA (4q12) and PDGFRB (5q32-33). The similar changes in the karyotype were also found in the lymph node cells. The undertaken treatment with hydroxyurea and the tyrosine kinase inhibitor dasatinib turned out to be ineffective. The patient underwent allogeneic BM transplantation from a HLA-identical sibling. Graft rejection occurred 6 months later. Allogeneic BM transplantation from the same donor (100% donor chimerism; FGFR1/8р11 translocation was not detected), which was complicated by the development of chronic graft-versus-host reaction, was performed again in March 2015. The patient is being followed up and continues to receive immunosuppressive therapy.

Background It is reasonable to incorporate quality of life (QoL) assessment into the comprehensive evaluation of treatment outcomes in chronic myeloid leukemia (CML) patients (pts) with deep molecular response (DMR) who enter the treatment-free remission (TFR) phase and stop therapy by tyrosine kinase inhibitors (TKIs). QoL assessment was included into the design of Russian prospective multicenter trial RU-SKI along with the clinical outcomes evaluation. Aim To study QoL in chronic phase (CP) CML pts with DMR before stopping TKI treatment and during TFR observation. Materials and methods The study has been conducted within the clinical approbation supported by the Ministry of Health of RF. The CML CP pts with therapy by any TKI ≥ 3 years (yrs) and stable DMR (BCR-ABL ≤0.01% IS) during ≥2 yrs were enrolled. Pts who met these criteria and had previous resistance to any TKI were also eligible. TKIs were resumed in case of major molecular response loss (MMR, BCR-ABL>0,1%). The QoL questionnaires RAND SF-36 and EORTC QLQ C30 were filled out by the pts before stopping TKI treatment and at 1, 3, 6 and 12 months (mo) after treatment discontinuation. The comparison group consisted of healthy persons matched by age and gender to CML CP pts (n=97). The Mann-Whitney test, paired Wilcoxon test and Generalized Estimation Equations (GEE) with adjustment to age, gender, the risk group according to Sokal score and duration of TKI treatment were used for the statistical analysis. Results QoL assessment was performed in all 99 CML CP pts who were enrolled into the trial during a period from Aug 2015 till Dec 2017. The TKIs before treatment cessation were as follows: imatinib and second-generation (2G) TKIs were used in 69(70%) and 30(30%) pts accordingly. 2G TKIs were used in 9(30%) and in 21(70%) pts as 1st and 2nd line accordingly. Mean age was 47±14.5 yrs, 48.5% were males, 12.1% had high Sokal risk score. The physical functioning of CML pts before stopping TKI treatment compared to the healthy controls was significantly worse (p<0.05). Other QoL scales before stopping TKI treatment were slightly worse with no statistically significant difference compared to healthy controls (figure 1). MMR was lost in 45 pts, and was maintained in 54 pts, Me follow-up time after TKI stop was 14,9 mo (range 2,5-32). The significant improvement of role physical functioning and role emotional functioning was found (p<0.05) in pts who maintained stable MMR during 12 mo after TKI discontinuation. The Integral QoL Index increased from 0,58 to 0,72 (p<0,001) in these pts. The decreasing of nausea/vomiting, diarrhea, shortness of breath at different time points (p<0.05) during TFR was revealed (figure 2). The QoL and symptoms before TKI interruption and after reinitiating of TKIs in 45 pts who resumed treatment were similar. The Integral QoL Index before and after stopping TKI treatment was 0.62 vs 0.64 (p>0.05). Conclusion The QoL in CML CP pts with DMR on TKI treatment is slightly worse and physical functioning is significantly lower as compared to healthy controls. The positive changes of the role functioning along with TKI treatment-related symptoms decrease were revealed in pts who maintained stable MMR during 12 mo of TFR. No changes in QoL and no new symptoms were found in pts who reinitiated treatment before and after TKIs interruption. The results of QoL assessment may contribute to optimization of the treatment strategies of CML patients with DMR. Disclosures Chelysheva: Fusion Pharma: Other: provided consultations ; Bristol Myers Squibb: Other: provided consultations and performed lectures; Novartis: Other: provided consultations and performed lectures. Shukhov:Bristol Myers Squibb: Other: provided consultations and performed lectures ; Novartis: Other: provided consultations and performed lectures . Turkina:Novartis: Other: provided consultations; Bristol Myers Squibb: Other: provided consultations; Phizer: Other: provided consultations; Fusion Pharma: Other: provided consultations. Ionova:Takeda: Research Funding; BMS: Research Funding.