Novel Population Pharmacokinetic Modeling of Arabinosyl Cytosine Triphosphate: Insights On Potential Preferential Formation of Ara-CTP Directly From Elacytarabine As Well As From Ara-C

Blood ◽  
2012 ◽  
Vol 120 (21) ◽  
pp. 3547-3547
Author(s):  
Corinne Seng Yue ◽  
Varsha V. Gandhi ◽  
Susan O'Brien ◽  
Farhad Ravandi ◽  
Tove Flem Jacobsen ◽  
...  
Keyword(s):  
Cancer Cells ◽  
Research Funding ◽  
Hematologic Malignancies ◽  
Employment Equity ◽  
Cholesterol Levels ◽  
Population Pk ◽  
Equity Ownership ◽  
Quality Of Fit ◽  
Arabinosyl Cytosine

Abstract Abstract 3547 Objectives: Elacytarabine (CP-4055) is an elaidic acid ester of arabinosyl cytosine (Ara-C), administered as a liposomal formulation, that is being developed to treat hematologic malignancies. CP-4055 is metabolized to Ara-C, which is transformed intracellularly to active arabinosyl cytosine triphosphate (Ara-CTP) and inactive deaminated metabolite arabinosyl uracil (Ara-U). The present analysis aimed to elucidate the pharmacokinetics (PK) of Ara-CTP and identify its relationship with CP-4055, Ara-C, Ara-U and various blood parameters measured in the target patient population. Methods: Patients suffering from hematologic malignancies, including refractory/relapsing acute myeloid leukemia (AML), who participated in Phase I or II CP-4055 trials, were included in this analysis. CP-4055 monotherapy was given as an intravenous infusion over 2 h/day for 5 days, 4 h/day for 5 days or continuously over 120 hours at doses ranging from 200 to 2500 mg/m2/day. Blood samples were collected at various time-points (until 168 hours post-dose) and plasma was assayed for CP-4055, Ara-C, and Ara-U using a validated LC-MS/MS method. Ara-CTP was measured by HPLC in isolated leukemic blast cells from AML patients. Cholesterol levels were also measured. Population PK analyses were conducted using the iterative two-stage method in ADAPT 5®. First, a model was determined for cholesterol, which was incorporated into a PK model for CP-4055, Ara-C and Ara-U. Individual PK parameters from this model were fixed and then used for the analysis of Ara-CTP. For Ara-CTP modeling, 1-compartment (cpt) models were tested with various routes of formation. For all models, model discrimination was performed using standard criteria (residual variability, quality of fit graphs, Akaike information criterion test). Results: In the cholesterol analysis, 13 patients (57 concentrations) were included while 43 patients (around 27 concentrations per patient) were included in the modeling of CP-4055, Ara-C and Ara-U. A subset of 17 patients (46 concentrations) was part of the Ara-CTP analysis. Cholesterol was described by an indirect model with a rate of elimination and a rate of formation that was increased by phospholipids infused along with CP-4055. CP-4055 PK was best described by a 2-cpt model, where the central cpt was partitioned into 2 sub-cpts. The first sub-cpt represented a lipid depot cpt where liposomal-bound CP-4055 was infused, and which transferred CP-4055 into the other sub-cpt, which represented CP-4055 released from liposomes. The transfer of CP-4055 from the liposomes was unidirectional and saturable, and cholesterol level influenced the size of the second sub-cpt. Ara-CTP appeared to be formed from unbound CP-4055, presumably within cancer cells, and was also formed as expected from Ara-C which was best described by a 2-cpt model, while Ara-U followed a 1-cpt model with an elimination that was dependent upon creatinine clearance. The proposed model is depicted below. Based on the model, terminal elimination half-life values for CP-4055, Ara-C, Ara-U and Ara-CTP were around 9, 68, 5 and 3 hours, respectively, and were independent of dose and infusion time. Residual variabilities for cholesterol, CP-4055, Ara-C, Ara-U and Ara-CTP were 21.0%, 34.0%, 39.4%, 12.5% and 29.2%, respectively. Conclusions: For the first time, a population PK approach was used to describe the PK of a triphosphate metabolite in relation to a parent drug as well as other metabolites. Indeed, the novel multi-cpt model developed herein simultaneously described and explained the PK of cholesterol, elacytarabine, Ara-C, Ara-U and Ara-CTP. The inclusion of cholesterol levels in the model improved the overall quality of fit, especially for administered liposomal-elacytarabine. The proposed PK model describing Ara-CTP disposition suggests that Ara-CTP is formed not only from Ara-C but also from elacytarabine, presumably within cancer cells, although the exact mechanism is unknown. Disclosures: Seng Yue: Learn and Confirm: Employment; Clavis Pharma: Consultancy. Gandhi:Clavis Pharma: Research Funding. O'Brien:Clavis Pharma: Research Funding. Ravandi:Clavis Pharma: Research Funding. Jacobsen:Clavis Pharma: Employment, Equity Ownership. Dirven:Clavis Pharma: Employment. Hagen:Clavis Pharma: Employment, Equity Ownership. Hals:Clavis Pharma: Employment. Ducharme:Learn and Confirm: Employment, Equity Ownership; Clavis Pharma: Consultancy.

Subset Analysis of Response to Treatment of Chronic Phase CML in a Phase 1 Study of Ponatinib in Refractory Hematologic Malignancies

Blood ◽  
2011 ◽  
Vol 118 (21) ◽  
pp. 602-602 ◽  
Author(s):  
Jorge E. Cortes ◽  
Hagop M. Kantarjian ◽  
Neil Shah ◽  
Dale Bixby ◽  
Michael J. Mauro ◽  
...  
Keyword(s):  
Board Of Directors ◽  
Median Time ◽  
Research Funding ◽  
Phase 1 ◽  
Chronic Phase ◽  
Hematologic Malignancies ◽  
Employment Equity ◽  
Advisory Committees ◽  
Mutation Status ◽  
Equity Ownership

Abstract Abstract 602 Background: Ponatinib is a potent, oral, pan-BCR-ABL inhibitor active against the native enzyme and all tested resistant mutants, including the uniformly resistant T315I mutation. Initial findings of a phase 1 trial in patients (pts) with refractory hematologic malignancies have been reported. The effect of duration of treatment, prior treatment, and mutation status on response to treatment was examined in CML chronic phase (CP) pts who responded to ponatinib. Methods: An open-label, dose escalation, phase 1 trial of ponatinib in pts with hematologic malignancies is ongoing. The primary aim is to assess the safety; anti-leukemic activity is also being investigated. Pts resistant to prior treatments or who had no standard treatment available were enrolled to receive a single daily oral dose of ponatinib (2 mg to 60 mg). Subset analyses of factors impacting cytogenetic and molecular response endpoints (MCyR and MMR) were performed for pts with CP-CML. Data are presented through April 15, 2011. Results: In total, 81 pts (54% male) received ponatinib. Overall, 43 pts had CP with 34 ongoing at analysis. MCyR was observed as best response in 31/43 (72%), 27 (63%) CCyR. The median time to MCyR was 12 (3 to 104) wks. Response rates were assessed by duration of treatment (1 pt in CCyR at entry was excluded; 6 pts in PCyR had to achieve CCyR). At the 3 month assessment, 22/42 (52%) CP pts achieved MCyR; at 6 months, 24/42 (57%); at 12 months, 29/42 (69%) had MCyR. The impact of prior treatment on response and time to response was assessed. 42 pts (98%) had >2 prior TKIs and 28 (65%) ≥3 prior TKIs, including investigational agents. Of approved TKIs, all pts were previously treated with imatinib, 19 dasatinib or nilotinib after imatinib, and 21 both dasatinib and nilotinib after imatinib. MCyR rate decreased with number of prior TKIs (2 prior TKIs 13/14 [93%], ≥3 prior TKIs 17/28 [61%]) and number of approved TKIs (imatinib followed by dasatinib or nilotinib 17/19 [90%], or by both dasatinib and nilotinib 12/21 [57%]). Time to response was prolonged in pts more heavily treated with prior TKIs. Median time to MCyR increased with the number of prior TKIs and approved TKIs (2 TKIs 12 wks, ≥3 TKIs 32 wks). The effect of mutation status on response and time to response was also evaluated. At entry, 12 pts had the T315I mutation, 15 had other BCR-ABL kinase domain mutations, 12 had no mutations detected, 4 did not allow sequencing. MCyR response rate for CP pts with T315I was 11/12 (92%); for other mutations, 10/15 (67%); and no mutation, 7/12 (58%). Similarly, mutation status had an impact on time to response: median time to MCyR was 12 wks for those with T315I or other mutations and 32 wks in resistant pts with no mutation. All CP patients were evaluable for MMR. At analysis, MMR was 17/43 (40%). MMR rate was inversely related to number of prior TKIs (2 TKIs 10/14 [71%], ≥3 TKIs 6/28 [21%]), approved TKIs (imatinib followed by dasatinib or nilotinib 12/19 [63%], or by both dasatinib and nilotinib 4/21 [19%]), and was higher for T315I pts (7/12, 58%) and those with other mutations (7/15, 47%) compared with no mutation (2/12, 17%). Median time to MMR for CP pts was 97 wks; median time to MMR was shorter for pts who were less heavily treated (2 prior TKIs 24 wks) and those with T315I or other mutations (63 wks). Conclusion: In this subset analysis of the phase 1 data, ponatinib had substantial activity in all subgroups analyzed. Time on treatment, less prior therapy and kinase domain mutations were associated with higher response rates and early responses in CP pts. Cytogenetic responses improved over the first 12 months of treatment and were higher in less heavily treated pts. Disclosures: Cortes: Novartis: Consultancy, Research Funding; BMS: Consultancy, Research Funding; Pfizer: Consultancy, Research Funding; Ariad: Consultancy, Research Funding. Kantarjian:Novartis: Consultancy, Research Funding; Pfizer: Consultancy, Research Funding; BMS: Consultancy, Research Funding; ARIAD: Research Funding. Shah:Ariad: Consultancy, Research Funding. Bixby:Novartis: Speakers Bureau; BMS: Speakers Bureau; GSK: Speakers Bureau. Mauro:ARIAD: Research Funding. Flinn:ARIAD: Research Funding. Hu:ARIAD: Employment. Clackson:ARIAD: Employment, Equity Ownership. Rivera:ARIAD: Employment, Equity Ownership. Turner:ARIAD: Employment, Equity Ownership. Haluska:ARIAD: Employment, Equity Ownership. Druker:MolecularMD: OHSU and Dr. Druker have a financial interest in MolecularMD. Technology used in this research has been licensed to MolecularMD. This potential conflict of interest has been reviewed and managed by the OHSU Conflict of Interest in Research Committee and t. Deininger:BMS: Consultancy, Membership on an entity's Board of Directors or advisory committees, Research Funding; Ariad: Consultancy, Membership on an entity's Board of Directors or advisory committees; Novartis: Consultancy, Membership on an entity's Board of Directors or advisory committees; Celgene: Research Funding; Genzyme: Research Funding. Talpaz:ARIAD: Research Funding.

Health Related Quality of Life of Bosutinib in Imatinib-Resistant or Imatinib-Intolerant Patients with Advanced Chronic Myeloid Leukemia

Blood ◽  
2012 ◽  
Vol 120 (21) ◽  
pp. 4448-4448 ◽  
Author(s):  
Jennifer Whiteley ◽  
Arlene Reisman ◽  
Virginia Kelly ◽  
Jorge E Cortes ◽  
David Cella
Keyword(s):  
Myeloid Leukemia ◽  
Research Funding ◽  
Well Being ◽  
Health Related Quality ◽  
Employment Equity ◽  
Blast Phase ◽  
Related Quality ◽  
Health Related ◽  
Equity Ownership

Abstract Abstract 4448 Purpose: Bosutinib is a dual Src/Abl tyrosine kinase inhibitor (TKI), which has demonstrated efficacy in a phase I/II study of patients with Advanced Phase Chronic Myeloid Leukemia (CML). The objective was to evaluate the effect of bosutinib on health -related quality of life (HRQoL) in patients with advanced CML after failure with imatinib. Methods: Patient reported HRQoL was an exploratory objective in the clinical trial and measured using the 44-item Functional Assessment of Cancer Therapy-Leukemia (FACT-Leu). The FACT-Leu is a modular approach to assess patient HRQoL using a core set of general cancer questions as well as a cancer site specific leukemia subscale with 5 domains: Social Well-being (SWB), Emotional Well-being (EWB), Physical Well-being (PWB), Functional Well-being (FWB) and Leukemia Subscale (LeuS); and 3 summary scales: FACT-General, FACT Trial Outcome Index (TOI) and FACT-Leu Total. The item responses for each scale are summed to provide scores; higher scores indicate better HRQoL. The FACT-Leu was completed at weeks 4, 8, 12 and every 12 weeks thereafter, as well as treatment completion. Within cohort comparisons were assessed using paired t-tests. Results: Of the 164 patients with advanced leukemia included in the trial, 76 had accelerated phase (AP) CML and 64 blast phase (BP) CML. At 24 weeks, AP patients reported statistically significant improvements in PWB (p=0.02), EWB (p<0.001), LeuS (p<0.001), FACT-G (p<0.001), FACT-Leu (p<0.001) and FACT-TOI (p<0.001) with the PWB, FACT-G, LeuS, TOI and FACT-Leu exceeding minimally important differences (MID) at 24 weeks. Blast phase patients reported significant improvements in PWB (p=0.02), EWB (p=0.02), FWB (p=0.04), LeuS (p=0.01), FACT-G (p<0.001), FACT-Leu (p<0.001) and FACT-TOI (p=0.01) at 24-weeks with all scales exceeding MID except the SWB. At 48-weeks the AP patients continued to have statistically significant improvements in PWB (p=0.05), EWB (p=0.02), and FACT-G (p=0.03) and PWB, FACT-G, TOI and FACT-Leu exceeded the MID at 48 weeks. There were no statistically significant deteriorations in HRQoL through week 48 (Figure 1) Conclusions: These data suggest that CML patients treated with bosutinib demonstrate improved HRQoL. Confirmation in a controlled study is needed. Disclosures: Whiteley: Pfizer Inc: Employment, Equity Ownership. Reisman:Pfizer Inc: Employment, Equity Ownership. Kelly:Pfizer Inc: Employment, Equity Ownership. Cortes:Novartis, Bristol Myers Squibb, Pfizer, Ariad, Chemgenex: Consultancy, Research Funding. Cella:Pfizer Inc: Honoraria, Research Funding.

Safety and Immunogenicity Of Inactivated Varicella-Zoster Virus Vaccine In Adults With Hematologic Malignancies Receiving Treatment With Anti-CD20 Monoclonal Antibodies

Blood ◽  
2013 ◽  
Vol 122 (21) ◽  
pp. 2290-2290
Author(s):  
Shelly McNeil ◽  
Robert Betts ◽  
Steven Lawrence ◽  
Andrea Velardi ◽  
Eva Kimby ◽  
...  
Keyword(s):  
Immune Response ◽  
Monoclonal Antibodies ◽  
Research Funding ◽  
Hematologic Malignancies ◽  
Employment Equity ◽  
Varicella Zoster ◽  
Cell Responses ◽  
Equity Ownership ◽  
Ifn Γ ◽  
Anti Cd20

Abstract Background Herpes zoster (HZ) incidence is higher in patients with hematologic malignancies (HM) (25-100 cases/1000 person-years) than in the general population (3-5 cases/1000 person-years). This immunocompromised population can experience significant morbidity and occasional mortality from complications associated with reactivation of the varicella-zoster virus (VZV). In general, there is limited data in the literature regarding the effect of anti-CD20 monoclonal antibodies, used in treatment of HM patients, on vaccine-related cell-mediated immune response. Due to the potential negative impact of anti-CD20 monoclonal antibodies on vaccine immunogenicity and efficacy, HM patients receiving anti-CD20 monoclonal antibodies have been excluded from prior inactivated VZV vaccine (inactivated-ZV) studies. This study evaluated the safety and immunogenicity of inactivated-ZV in HM patients receiving anti-CD20 monoclonal antibody therapy. Methods This was an open label, single arm, multicenter Phase I study of a 4-dose inactivated-ZV regimen (∼30 days between each dose) in patients ≥18 years old with HM receiving anti-CD20 monoclonal antibodies either as a single agent or in a combination chemotherapy regimen and not likely to undergo HCT (n=80). Blood samples were collected at baseline prior to dose 1 and 28 days postdose 4 to measure VZV-specific T-cell responses using interferon-gamma enzyme-linked immunospot (IFN-γ ELISPOT). The primary hypothesis was that inactivated-ZV would elicit significant VZV-specific immune responses at ∼28 days postdose 4, with the statistical criterion being that the lower bound of the two-sided 90% confidence interval (CI) on the geometric fold rise (GMFR) be >1.0. All vaccinated patients were evaluated for adverse events (AE), including VZV-like rashes, through 28 days postdose 4. Results The 4-dose inactivated-ZV regimen elicited a statistically significant VZV-specific immune response measured by IFN-γ ELISPOT at 28 days postdose 4 in the per-protocol population (GMFR = 4.34 [90% CI: 3.01, 6.24], p-value <0.001). As the lower bound of the 2-sided 90% CI for GMFR was >1.0, the pre-specified primary immunogenicity success criterion was met. Overall, 85% (68/80) of patients reported ≥1 AEs, 44% (35/80) reported ≥1 injection-site AEs, and 74% (59/80) reported ≥1 systemic AEs. The most common injection-site AEs were pain (32%), erythema (31%), and swelling (26%). The most common systemic AEs were pyrexia (25%) and diarrhea (14%). Twelve patients (15%) experienced serious AEs, including one event determined by the investigator to be vaccine-related (convulsion: day 8 postdose 1). One patient experienced a fatal serious AE (Richter’s transformation to Hodgkin’s disease; day 34 postdose 1) assessed as not vaccine-related by the investigator. In general, the frequencies of AEs did not increase with subsequent doses of vaccine. No inactivated-ZV recipient had a rash that was PCR positive for VZV vaccine strain. Conclusions In adults with HM receiving anti-CD20 monoclonal antibodies, inactivated-ZV was well tolerated and elicited statistically significant VZV-specific T-cell responses ∼28 days postdose 4. Disclosures: McNeil: Merck: investigator Other, Research Funding. Betts:Merck: investigator Other, Research Funding. Lawrence:Merck: investigator Other, Research Funding. Velardi:Merck: investigator Other, Research Funding. Kimby:Merck: investigator Other, Research Funding. Pagnoni:Merck: Employment, Equity Ownership. Stek:Merck: Employment, Equity Ownership. Zhao:Merck: Employment, Equity Ownership. Chan:Merck: Employment, Equity Ownership. Lee:Merck: Employment, Equity Ownership. Parrino:Merck: Employment, Equity Ownership.

Cost-Effectiveness Analysis (CEA) of Sequential Treatment with Tyrosine Kinase Inhibitors (TKIs) for Chronic Myelogenous Leukemia (CML)

Blood ◽  
2014 ◽  
Vol 124 (21) ◽  
pp. 2607-2607
Author(s):  
John Whalen ◽  
Ipek Stillman ◽  
Apoorva Ambavane ◽  
Eugene Felber ◽  
Dinara Makenbaeva ◽  
...  
Keyword(s):  
Research Funding ◽  
Lifetime Cost ◽  
Chronic Phase ◽  
Cytogenetic Response ◽  
High Dose ◽  
Employment Equity ◽  
Equity Ownership ◽  
Tki Treatment ◽  
Economic Analyses

Abstract Background: Imatinib has been approved for treatment of newly diagnosed CML since 2001. For patients failing imatinib, other treatment options such as dasatinib, nilotinib, bosutinib, and high-dose imatinib are recommended. Previous economic analyses assumed that patients are treated until progression, despite guidelines recommending changing treatments for non-responders. The objective was to perform a CEA of sequential treatment with 2nd line TKIs, from a commercial payer perspective in the United States (US). Methods: A Markov-cohort model was used to simulate lifetime treatment costs and health outcomes (discounted 3.0% per annum) for patients resistant or intolerant to 1st line imatinib. It compared six treatment sequences, starting from 2nd line (shown in the results table). The model included five health states: chronic phase 2nd line TKI, chronic phase 3rd line TKI, chronic phase no TKI, post-progression, and death. After 12 months of TKI treatment, patients without a major molecular or complete cytogenetic response (MMR or CCyR) moved to the next line of therapy (per NCCN guidelines). Patients could also move to the next treatment line if they lost MMR or CCyR, or discontinued due to drug-related toxicity. Data for response achievement, risks of progression, death, adverse events, and discontinuation were primarily based on data in published trials. Due to the lack of head-to-head studies for dasatinib vs. nilotinib in 2nd line, and a lack of time-to-response data for all three 2nd line treatments, MMR and CCyR rates were interpolated from available data points in 2nd line, while dasatinib and nilotinib rates were assumed to be equal in 3rd line. Dasatinib and imatinib progression, loss of response, and survival rates for 2nd line responders were assumed equal, due to data limitations. In each health state, patients accrued drug costs, resource use (related to monitoring, AE management, and disease management) costs and quality-adjusted life years (QALYs). Resource use, cost, and utility estimates were based on FDA labels, RedBook, Medicare and AHRQ Healthcare Cost Utilization Project data, and published economic analyses. Multi-way uncertainty analyses evaluated key contributors to uncertainty in the results, by testing various assumptions for probabilities of discontinuation, response, loss of response, progression, and survival. Results: The model predicts that 2nd line dasatinib provides increased survival (ΔLYs = ~0.4-2.6 years) and QALYs (ΔQALYs = ~0.4-2.8 years) in all patient groups when compared with 2nd line high-dose imatinib or nilotinib sequences. Also, 2nd line dasatinib was more costly (ΔLifetime Costs = ~$65,000 - $225,000) than high-dose imatinib and nilotinib, primarily due to longer survival and corresponding longer time on TKI treatment. In ±20% univariate sensitivity analyses, the model was most sensitive to 2nd line progression and survival estimates. Conclusions: This analysis suggests that dasatinib may be associated with increased life expectancy and quality of life when compared with high dose imatinib or nilotinib, among patients who are resistant or intolerant to 1st line imatinib, primarily based on higher cytogenetic response rates observed in studies of dasatinib. Other studies have shown improved quality of life for responders, and landmark analyses have shown improved survival for patients achieving cytogenetic response, but head-to-head clinical studies of sequential use of dasatinib and nilotinib are needed to confirm the model result. Based on the threshold of $150,000/QALY, dasatinib can be considered cost-effective in the US. Results Table: Sequence # Sequence 1 Sequence 2 Sequence 3 Sequence 4 Sequence 5 Sequence 6 1st line (not modeled – assumes 1st line imatinib for all sequences) 2nd line DAS NIL HDI DAS NIL HDI 3rd line NIL DAS NIL BOS BOS DAS Imatinib-resistant population LYs 7 6.5 4.5 7.3 6.8 4.5 QALYs 5.9 5.4 3.6 6.2 5.7 3.6 Lifetime Cost $497,391 $431,346 $270,308 $496,897 $431,084 $270,051 ICERs: DAS followed by NIL vs. NIL followed by DAS - $129,139 DAS followed by NIL vs. HDI followed by NIL - $96,356 Imatinib-intolerant population LYs 7.8 7.1 -- 8.1 7.4 -- QALYs 6.7 6.0 -- 7.0 6.3 -- Lifetime Cost $599,270 $509,456 -- $598,766 $509,174 -- ICERs: DAS followed by NIL vs. NIL followed by DAS - $125,800 BOS=bosutinib; DAS=dasatinib; HDI= high-dose imatinib; NIL=nilotinib; ICER=incremental cost-effectiveness ratio Disclosures Whalen: Evidera, Inc.: Consultancy, Employment; Bristol-Myers Squibb: Research Funding. Stillman:Evidera, Inc.: Consultancy, Employment; Bristol-Myers Squibb: Research Funding. Ambavane:Evidera, Inc.: Consultancy, Employment; Bristol-Myers Squibb: Research Funding. Felber:Bristol-Myers Squibb: Employment, Equity Ownership. Makenbaeva:Bristol-Myers Squibb: Employment, Equity Ownership. Bolinder:Bristol-Myers Squibb: Employment, Equity Ownership.

scholarly journals Population Pharmacokinetic (PK)/Pharmacodynamic (PD) Modeling of Myelosuppression in Patients with Hematologic Malignancies for CPX-351 and Standard-of-Care 7+3 Therapy

Blood ◽  
2018 ◽  
Vol 132 (Supplement 1) ◽  
pp. 4037-4037
Author(s):  
Qi Wang ◽  
Sarah F. Cook ◽  
Scott A. Van Wart ◽  
Donald E. Mager ◽  
Stefan Faderl
Keyword(s):  
Platelet Count ◽  
Median Time ◽  
Median Duration ◽  
Model Development ◽  
Hematologic Malignancies ◽  
Employment Equity ◽  
Compartment Models ◽  
Platelet Counts ◽  
Population Pk ◽  
Equity Ownership

Abstract CPX-351 (Vyxeos®), a liposomal encapsulation of cytarabine and daunorubicin at a synergistic ratio, has demonstrated a significant survival benefit vs standard 7+3 in patients (pts) with high-risk/secondary AML. A population PK/PD analysis assessed the correlation between cytarabine and daunorubicin plasma concentrations and myelosuppressive effects (neutropenia, thrombocytopenia) of CPX-351 and 7+3. The PK/PD population for model development included pts with advanced hematologic malignancies from 3 clinical studies. For CPX-351 and 7+3, respectively, 129 and 79 pts were included in the final neutropenia PK/PD analysis and 137 and 86 pts were included in the final thrombocytopenia PK/PD analysis. For the neutropenia model, median age and body weight were 67 y (range: 23-81) and 78.7 kg (39.5-156.5) for CPX-351 and 68 y (60-75) and 83.0 kg (53.9-136.0) for 7+3. PK/PD analyses were conducted using nonlinear mixed-effects modeling in NONMEM. Pt-specific PK profiles were simulated using previously developed population PK models for CPX-351 and 7+3. Blood cell dynamics were described by transit-compartment models with proliferating, maturating, and circulating neutrophils or platelets. The effects of CPX-351 or 7+3 were applied to the proliferation phases of the compartment models by a molar composite PK driver (plasma cytarabine + daunorubicin). Inhibition of proliferation of blood cells by CPX-351 and 7+3 is assumed to be similar, via a sigmoidal Imax function. Co-medication of granulocyte colony stimulating factor (GCSF) or platelet infusion was accounted for during model development. Covariates (eg, demographics, clinical laboratory measures, disease status) were evaluated. Model evaluation and selection were assessed using a standard model discrimination process that included statistical criteria (eg, objective function value) and graphical representations of goodness-of-fit. In the final neutrophil PK/PD models, baseline circulating neutrophil counts were similar for CPX-351 (3.55 × 109/L) and 7+3 (3.76 × 109/L). Mean transit times (MTT) between maturation compartments were estimated at values of 113 h for CPX-351 and 88 h for 7+3. Effects of GCSF on neutrophil production were assumed to be similar for CPX-351 and 7+3. Both treatments had similar maximum inhibition on neutrophil proliferation, with Imax values around 1. However, estimated IC50 values were very different: 24.9 µM for CPX-351 and 0.0286 µM for 7+3. In the final platelet PK/PD models, baseline circulating platelet counts were the same (98.1 × 109/L) for both CPX-351 and 7+3. The MTTs between each compartment of the maturation processes were 91.2 h for CPX-351 and 120 h for 7+3. Drug-specific parameters for CPX-351 and 7+3, respectively, were as follows: Imax, 0.316 and 1; IC50, 0.324 and 0.0982 µM. To better understand the behavior of the models and parameter estimates, simulations were conducted to evaluate the temporal events of myelosuppression. Model simulations were conducted for 200 pts with characteristics similar to the PK/PD model population. During simulations, no platelet transfusion or GCSF was administered. Pts received CPX-351 100 units/m2 (cytarabine 100 mg/m2 + daunorubicin 44 mg/m2) as a 90-min IV infusion on Days 1, 3 and 5 or 7+3 (cytarabine 100 mg/m2/day IV for 7 days continuously + daunorubicin 60 mg/m2 IV on Days 1-3). Median time to initially observe a blood neutrophil count <0.5 × 109/L was longer following CPX-351 (8.3 d) vs 7+3 (7.4 d) treatment. The median duration with neutrophil counts <0.5 × 109/L was longer with CPX-351 (23 d) vs 7+3 (14 d). The median lowest neutrophil counts were well below 0.2 × 109/L for both CPX-351 (0.007 × 109/L) and 7+3 (0.026 × 109/L). Median time to initially observe a platelet count <50 × 109/L was 6.4 d after CPX-351 and 5.8 d after 7+3, while the median time to an observed platelet count <20 × 109/L was 10.8 d and 8.9 d, respectively. The median duration with platelet counts <20 × 109/L was longer with CPX-351 (18 d) vs 7+3 (8 d), and the median duration of platelet counts <50 × 109/L was 22 d and 15 d, respectively. The median lowest platelet counts were 11.3 × 109/L with CPX-351 and 4.7 × 109/L with 7+3. In summary, the median duration of myelosuppressive effects was longer with CPX-351 than 7+3, and the median time for initial detection of myelosuppression with CPX-351 was 1 to 2 days later than with 7+3, which might affect the clinical monitoring scheme. Disclosures Wang: Jazz Pharmaceuticals: Employment, Equity Ownership. Cook:Jazz Pharmaceuticals: Consultancy. Van Wart:Jazz Pharmaceuticals: Consultancy. Mager:Jazz Pharmaceuticals: Consultancy. Faderl:Jazz Pharmaceuticals: Employment, Equity Ownership.

scholarly journals Patient-Reported Outcomes (PRO) Data from Patients (Pts) with Essential Thrombocythemia (ET) Enrolled in the MOST Study

Blood ◽  
2019 ◽  
Vol 134 (Supplement_1) ◽  
pp. 1665-1665
Author(s):  
Ellen K. Ritchie ◽  
Anas Al-Janadi ◽  
Philomena Colucci ◽  
Patricia Kalafut ◽  
Dilan Paranagama ◽  
...  
Keyword(s):  
Quality Of Life ◽  
Global Health ◽  
Research Funding ◽  
Symptom Burden ◽  
Advisory Board ◽  
Employment Equity ◽  
Scale Scores ◽  
Equity Ownership ◽  
Eortc Qlq

Introduction: ET is a chronic myeloproliferative neoplasm (MPN) characterized by thrombocytosis and an increased risk for thrombotic and hemorrhagic events. ET can be associated with substantial symptom burden, impaired quality of life (QoL), and reduced survival. PRO data pertaining to the impact of ET on QoL and symptom burden in these pts are limited. The ongoing Myelofibrosis and Essential Thrombocythemia Observational STudy (MOST) was designed to collect data about the demographics, disease burden, PROs, and management of pts with ET or myelofibrosis (MF) in clinical practices throughout the United States. This analysis describes PROs from pts with ET enrolled in MOST. Methods: MOST is a longitudinal, multicenter, noninterventional, prospective, observational study (NCT02953704). Eligible adults with ET were ≥60 years of age, had a history of thrombotic events, or were receiving ET-directed therapy. PROs were collected in conjunction with usual-care visits approximately every 6 months over a planned observation period of 36 months. Patient-reported symptom burden was assessed with the disease-specific MPN Symptom Assessment Form Total Symptom Score (MPN-SAF TSS), composed of 10 items (fatigue, early satiety, abdominal discomfort, inactivity, concentration problems, night sweats, itching, bone pain, fever [>100oF], weight loss). The MPN-SAF numbness/tingling item was also included in the questionnaire but was not included in the TSS calculation. Symptom severity was graded from 0 (absent) to 10 (worst imaginable), with a possible TSS ranging from 0 to 100. Health-related QoL was evaluated with the European Organization for Research and Treatment of Cancer Core Quality of Life Questionnaire (EORTC QLQ-C30 v3.0), composed of 5 functional scales, 3 symptom scales, 6 additional single-symptom items, and a global health/QoL scale. For functional and global health/QoL scales, higher scores indicate higher functioning and better global health/QoL, respectively. For symptom scales/items, higher scores indicate greater symptom burden. High-risk pts and low-risk pts receiving ET-directed therapy (excluding aspirin only) with baseline PRO data were included in this analysis. Data were summarized with descriptive statistics. Results: The MOST study enrolled 1234 pts with ET between Nov 29, 2016 and March 29, 2019 at 124 sites. Of these pts, 794 qualified for this analysis (data cut-off date, June 17, 2019); median age was 70 (range, 19-93) years, 80% were ≥60 years of age, 68% were women, 90% were white, 42% were working full or part-time, and 4% had a documented family history of MF, ET, or polycythemia vera. The majority of pts (87%) had high-risk ET. At enrollment, 768 pts completed the MPN-SAF. Mean (SD) TSS was 17.1 (15.6); 33% of pts had TSS ≥20. Women had higher mean (SD) TSS than men (18.5 [15.8] vs 14.2 [14.9]) and had higher mean individual symptom scores, except for weight loss and fever. The highest mean (SD) individual symptom scores were fatigue (3.4 [2.7]), numbness/tingling (2.3 [3.0]), inactivity (2.3 [2.8]), and early satiety (2.3 [2.7]) (Fig A). The most frequently reported severe symptoms (ie, score ≥7) were fatigue (17% [127/746]), numbness/tingling (14% [107/767]), and inactivity (11% [86/762]). At enrollment, 794 pts completed the EORTC QLQ-C30. The highest mean (SD) symptom scale scores (score ≥15) were fatigue (29.6 [25.8]), insomnia (28.6 [30.6]), pain (22.1 [27.9]), dyspnea (17.2 [25.5]), and constipation (15.7 [25.2]) (Fig B). The mean (SD) global health status/QoL score was 72.7 (21.9); functional scores ranged from 79.9 (21.9) for emotional functioning to 85.2 (24.1) for social functioning (Fig C). The average functional scale scores and symptom scale scores indicate higher functioning and less symptom burden, respectively, in men vs women. Conclusion: Pts with ET experienced a high symptom burden; fatigue was the most common and highest in severity. Symptom burden and quality of life scores in the current study were similar to prior reports (Emanuel J Clin Oncol 2012; Scherber Blood 2011). Women reported higher symptom burden than men in both the MPN-SAF and EORTC QLQ-30. Of note, numbness/tingling, which is not included in the MPN-SAF TSS calculation, was one of the most frequently reported severe symptoms for pts with ET in MOST. Future analyses from this trial will continue to increase understanding of the symptom burden and its impact on QoL in pts with ET. Disclosures Ritchie: Celgene, Incyte, Novartis, Pfizer: Consultancy; Genentech: Other: Advisory board; Tolero: Other: Advisory board; Pfizer: Other: Advisory board, travel support; agios: Other: Advisory board; Celgene: Other: Advisory board; Jazz Pharmaceuticals: Research Funding; Celgene, Novartis: Other: travel support; AStella, Bristol-Myers Squibb, Novartis, NS Pharma, Pfizer: Research Funding; Ariad, Celgene, Incyte, Novartis: Speakers Bureau. Al-Janadi:Incyte: Honoraria, Other: Travel, Accommodations, Expenses, Research Funding; Celgene: Honoraria, Other: Travel, Accommodations, Expenses, Research Funding, Speakers Bureau; Genentech/Abbvie: Honoraria, Other: Travel, Accommodations, Expenses, Speakers Bureau; Genentech/Roche: Honoraria, Other: Travel, Accommodations, Expenses, Speakers Bureau; Gilead Sciences: Consultancy, Honoraria, Other: Travel, Accommodations, Expenses; Sandoz-Novartis: Consultancy, Honoraria; Alexion Pharmaceuticals: Consultancy, Honoraria, Other: Travel, Accommodation, Expenses, Research Funding, Speakers Bureau; Takeda: Consultancy, Honoraria, Other: Travel, Accommodations, Expenses, Research Funding, Speakers Bureau; MEI Pharma: Research Funding; Seattle Genetics: Consultancy, Honoraria, Other: Travel, Accommodations, Expenses. Colucci:Incyte: Employment, Equity Ownership. Kalafut:Incyte: Employment, Equity Ownership. Paranagama:Incyte: Employment, Equity Ownership. Mesa:Genotech: Research Funding; Promedior: Research Funding; Sierra Onc: Consultancy; Celgene: Research Funding; AbbVie: Research Funding; Novartis: Consultancy; La Jolla Pharma: Consultancy; CTI Biopharma: Research Funding; Samus: Research Funding; Incyte: Research Funding.

scholarly journals IPH4102; An Anti-KIR3DL2 Monoclonal Antibody in Refractory Sezary Syndrome: Results from a Multicenter Phase 1 Trial

Blood ◽  
2018 ◽  
Vol 132 (Supplement 1) ◽  
pp. 684-684 ◽  
Author(s):  
Martine Bagot ◽  
Pierluigi Porcu ◽  
Basem M. William ◽  
Maxime Battistella ◽  
Maarten Vermeer ◽  
...  
Keyword(s):  
Quality Of Life ◽  
Monoclonal Antibody ◽  
Board Of Directors ◽  
Research Funding ◽  
Phase 1 ◽  
Employment Equity ◽  
Advisory Committees ◽  
Multicenter Phase ◽  
Equity Ownership

Abstract Aims: Sezary Syndrome (SS) is the most aggressive form of cutaneous T cell lymphoma (CTCL), characterized with high blood involvement and expression of Killer cell immunoglobulin like receptor 3DL2 (KIR3DL2). IPH4102 is a first-in-class monoclonal antibody that targets KIR3DL2. Very limited effective treatment options are available for SS patients with refractory disease. We conducted a phase 1 study testing IPH4102 in patients with refractory CTCL. Here we report results from the SS subset. Methods: IPH4102-101 study is a multicenter phase I trial composed of a dose escalation and cohort expansion portions that evaluated IPH4102 in patients with refractory CTCL. Key eligibility criteria included failure of ≥ 2 prior systemic therapies. KIR3DL2 testing was performed for all patients at baseline and at different time points throughout the study. IPH4102 was given Q1w x 4 weeks, followed by Q2w x 10 weeks then Q4w until disease progression or unacceptable toxicity. Primary endpoint is safety. Main 2ry endpoints include best global response (BGR) using the Olsen criteria, progression-free survival (PFS), duration of response (DOR), quality of life (QOL) and biomarker analyses. Results: The study included 35 SS patients, 20 in the dose escalation and 15 in the cohort expansion, with a median age of 70 years (37-90). Median time from initial SS diagnosis to starting IPH4012 was 22.8 months. Nineteen patients (54%) received IPH4102 as ≥ 4th line of systemic therapy and 7 (20%) were previously treated with mogamulizumab. Thirteen patients (37%) had lymph node involvement as per investigator assessment and based on radiological examination while 7 patients (20%) had evidence of large cell transformation. KIR3DL2 expression was observed in either skin or blood in 33 patients (94%) and in both in 28 patients (80%). Most common adverse events (AEs) were asthenia (26%), peripheral edema (26%), and fatigue (23%), which were all grade 1-2. Possibly related grade ≥ 3 AEs were observed in 7 patients (20%), and only 2 patients (6%) stopped treatment for an AE. Table 1 shows BGR and response by compartment. Overall response rate was 42.9% [95% CI: 28.0% - 59.1%], with median time to response of 4.8 months. Median DOR and PFS were 5.6 months [95% CI: 3.2-not reached] and 12.8 months [95% CI: 8.1-not reached], respectively. Mogamulizumab pretreated patients showed BGR, median DOR and PFS of 42.9%, 13.8 and 20.9 months, respectively. Quality of life assessment was performed using the Pruritus VAS score andSkinDex29. Patients with CR, PR or SD showed marked improvement overtime of all evaluated parameters including SkinDex29 global, symptoms, emotional, and functional scores. Biomarker analysis showed progressive decrease in CD4/CD8 ratio in responding patients. The decrease of KIR3DL2+ expressing cells in skin evaluated by immunohistochemistry at week 5 and 14 was able to predict BGR (AUC=0.749, 0.714, respectively). Figure 1 shows reduction in KIR3DL2 expressing cells at week 5 and week 14 in a patient who had PR as BGR. To date, 9 patients are still ongoing treatment. Updated clinical and correlative research analyses will be presented at the meeting. Conclusions: IPH4102 is highly effective in patients with refractory SS. It induces meaningful clinical activity and improves quality of life placing it as an encouraging treatment option for these patients. Further development in SS and other T-cell malignancies is underway. Disclosures Bagot: Actelion: Membership on an entity's Board of Directors or advisory committees; Innate Pharma: Consultancy, Equity Ownership, Membership on an entity's Board of Directors or advisory committees; Takeda: Membership on an entity's Board of Directors or advisory committees; Kyowa Kirin: Membership on an entity's Board of Directors or advisory committees. Porcu:Innate Pharma: Consultancy. Khodadoust:Innate Pharma: Research Funding. Sicard:Innate Pharma: Employment, Equity Ownership. Azim:Innate Pharma: Employment, Equity Ownership. Kim:miRagen: Research Funding; Takeda: Membership on an entity's Board of Directors or advisory committees, Research Funding; Horizon Pharma: Consultancy, Research Funding; Galderma: Research Funding; Tetralogic: Research Funding; Neumedicine: Consultancy, Research Funding; Soligenix: Research Funding; Portola: Research Funding; Forty Seven Inc: Research Funding; Seattle Genetics: Membership on an entity's Board of Directors or advisory committees; Merck: Research Funding; Medivir: Membership on an entity's Board of Directors or advisory committees; Kyowa-Kirin-Pharma: Membership on an entity's Board of Directors or advisory committees, Research Funding; Innate Pharma: Consultancy, Membership on an entity's Board of Directors or advisory committees, Research Funding; Eisai: Membership on an entity's Board of Directors or advisory committees, Research Funding.

scholarly journals Population Pharmacokinetics of Ivosidenib (AG-120) in Patients with IDH1-Mutant Advanced Hematologic Malignancies

Blood ◽  
2018 ◽  
Vol 132 (Supplement 1) ◽  
pp. 1394-1394 ◽  
Author(s):  
Kha Le ◽  
Russ Wada ◽  
David Dai ◽  
Bin Fan ◽  
Guowen Liu ◽  
...  
Keyword(s):  
Body Weight ◽  
Steady State ◽  
Eastern Cooperative Oncology Group ◽  
Hematologic Malignancies ◽  
Employment Equity ◽  
Disease Characteristics ◽  
Population Pk ◽  
Cyp3a4 Inhibitors ◽  
Equity Ownership ◽  
The Impact

Abstract BACKGROUND: Ivosidenib, a potent mutant isocitrate dehydrogenase 1 (mIDH1) inhibitor, is being assessed in a phase 1 study of mIDH1 advanced hematologic malignancies (NCT02074839). We characterized the pharmacokinetics (PK) of ivosidenib in this population, and the effects of patient/disease characteristics and concomitant medications. METHODS: Ivosidenib was given in continuous 28-day cycles at 100 mg twice daily and 300 mg, 500 mg, 800 mg, and 1200 mg once daily (QD). Enrollment is complete; 258 patients received ≥1 ivosidenib dose (78 in escalation, 180 in expansion); samples were available from 253 patients (223 received ivosidenib 500 mg QD). Ivosidenib concentrations were determined using validated liquid chromatography with tandem mass spectrometry (LC-MS/MS)-based methods. Population PK modeling was conducted using NONMEM software. The impact of demographics, renal and hepatic function, disease type, Eastern Cooperative Oncology Group (ECOG) performance status, and concomitant cytochrome P450 3A4 (CYP3A4) inhibitors/inducers and gastric acid reducers on ivosidenib PK was explored. RESULTS: Ivosidenib PK were best described using a 2-compartment model with first-order absorption, dose-dependent bioavailability, and a time-dependent change in relative bioavailability and clearance between Day 1 and steady state. Mean steady-state apparent clearance (CL/F) was 5.39 L/h (between-patient variability ~35%) and mean central volume of distribution (Vc/F) was 234 L (~47%). Less than dose-proportional bioavailability was observed, with a dose doubling translating to a ~40% increase in exposure. The moderate/strong CYP3A4 inhibitors voriconazole, fluconazole, and posaconazole were associated with 36%, 41%, and 35% reductions in CL/F, and hence 57%, 69%, and 53% increases in area under the plasma ivosidenib concentration-time curve (AUC), respectively (Figure 1). Baseline body weight had a significant impact on Vc/F. Low albumin at baseline and during treatment correlated with decreased CL/F and Vc/F. However, the effects of body weight and albumin did not appear to be clinically relevant. No effects of creatinine clearance or measures of liver function (alanine aminotransferase, aspartate aminotransferase, bilirubin, within the range studied) on ivosidenib CL/F were detected. Concomitant use of pantoprazole or famotidine did not affect ivosidenib CL/F. CONCLUSION: This population PK model of ivosidenib suggests that no dose adjustments are needed based on the range of patient and disease characteristics analyzed. Disclosures Le: Millennium: Patents & Royalties; Agios: Employment, Equity Ownership. Wada:Certara: Employment; Agios: Consultancy. Dai:Agios: Employment, Equity Ownership. Fan:Agios: Employment, Equity Ownership. Liu:Agios: Employment, Equity Ownership. Liu:Agios: Employment, Equity Ownership. Attar:Agios: Employment, Equity Ownership. Agresta:Agios: Employment, Equity Ownership. Yang:Agios: Employment, Equity Ownership.

Health-Related Quality of Life and Symptoms in Myelofibrosis Patients Treated with Ruxolitinib Versus Best Available Therapy

Blood ◽  
2011 ◽  
Vol 118 (21) ◽  
pp. 795-795
Author(s):  
Claire N. Harrison ◽  
Jean-Jacques Kiladjian ◽  
Haifa Kathrin Al-Ali ◽  
Heinz Gisslinger ◽  
Laurent Knoops ◽  
...  
Keyword(s):  
Research Funding ◽  
Treatment Phase ◽  
Well Being ◽  
Employment Equity ◽  
Advisory Committees ◽  
Eortc Qlq C30 ◽  
Health Related ◽  
Equity Ownership ◽  
Eortc Qlq

Abstract Abstract 795FN2 Background: Ruxolitinib (INC424), a potent and selective oral JAK1 and JAK2 inhibitor, demonstrated rapid and durable reductions in splenomegaly and improved disease-related symptoms, role functioning, and quality of life (QoL) in 2 phase 3 studies in patients with myelofibrosis (MF) (the COMFORT studies). Per-protocol, patient-reported, health-related QoL (HRQoL) and symptoms analyses in the COMFORT-II study are limited. Here we report on additional post hoc analyses of these outcomes. The COMFORT-II study includes 219 patients (ruxolitinib, n=146; best available therapy [BAT], n=73). At entry, all patients were classified into intermediate 2-risk or high-risk prognostic groups (Cervantes F, et al. Blood, 2009;113(13):2895-2901) and had palpable splenomegaly ≥5 cm below the costal margin. Patients could have received prior therapy for MF. On BAT, doses and schedules or no therapy were selected by the investigator; therapy adjustments were permitted during the randomized treatment phase at the investigator's discretion. Patients in both arms continued in the randomized treatment phase as long as there was no protocol-defined disease progression. Methods: The European Organisation for the Research and Treatment of Cancer (EORTC) QoL Questionnaire–Core 30 (QLQ-C30) and Functional Assessment of Cancer Therapy–Lymphoma (FACT-Lym) questionnaires were assessed at baseline and weeks 8, 16, 24, and 48. EORTC QLQ-C30 consists of 30 items combined into 15 subscales (Global Health Status/QoL, 5 functioning subscales, and 9 symptom subscales; scores range from 0 to 100, and higher scores indicate better HRQoL and functioning but a worsening of symptoms). FACT-Lym consists of 42 items combined into 8 subscales (4 well-being subscales; 1 symptom subscale [LymS]; and 3 total scale scores: FACT-General [G], FACT-Lym trial outcome index [TOI], and FACT-Lym total; scores for the different subscales vary from 0–28 to 0–168, and higher scores indicate better outcomes). This analysis includes evaluable patients in the randomized treatment phase and assesses changes from baseline in HRQoL and MF symptom scores, including the EORTC subscales, LymS, and FACT total scores, which incorporate well-being and/or symptom subscales. Mixed-model analyses, adjusted for age, sex, baseline score, and prognostic risk category, are used to evaluate treatment differences at each time point and overall across time. Results: HRQoL and MF symptoms, on average, improved compared with baseline for patients receiving ruxolitinib, but remained the same or worsened for patients receiving BAT. Based on the EORTC QLQ-C30, the treatment differences in physical functioning, role functioning, fatigue, and appetite loss significantly favored ruxolitinib starting at week 8 (P <.05) and remained significant at week 48 (P <.05). The overall between-treatment differences (on average across time) in adjusted mean change from baseline for MF symptom scores (95% confidence interval) were: Fatigue, –10.2 (–15.9, –4.5; P <.001); Dyspnea, –11.6 (–17.6, –5.6; P <.001); Appetite loss, –16.3 (–21.5, –11.1; P <.0001); Insomnia, –9.8 (–16.7, –3.0; P <.01); and Pain, –9.0 (–14.9, –3.0), P <.01); negative values favor ruxolitinib. Global Health Status/QoL (Figure) was significantly improved in the ruxolitinib arm compared with the BAT arm at weeks 8, 16, and 48. Scores on the LymS, which includes symptoms of pain, swelling, fever, night sweats, itching, trouble sleeping, fatigue, weight loss, loss of appetite, trouble concentrating, and other patient concerns, also improved significantly during treatment (Figure). Additionally, FACT-G, FACT-Lym TOI, and FACT-Lym total scores were all significantly (P <.05) improved for patients receiving ruxolitinib treatment compared with BAT. Most EORTC QLQ-C30 and FACT-Lym scores improved significantly on ruxolitinib compared with BAT. The treatment effect between the high-risk and intermediate 2-risk prognostic groups was not significantly different based on an analysis of the risk group–by–treatment interaction. Conclusions: These additional analyses from the COMFORT-II study further support that ruxolitinib significantly improves overall HRQoL and MF symptoms compared with BAT. Disclosures: Harrison: Novartis: Honoraria; Incyte: Honoraria; S*Bio: Honoraria; Celgene: Honoraria; Sanofi Aventis: Honoraria. Kiladjian:Novartis: Honoraria; Celgene: Honoraria. Gisslinger:Novartis: Speakers Bureau; Celgene Austria: Research Funding, Speakers Bureau; Aop-Orphan: Speakers Bureau. Knoops:Novartis: Consultancy. Waltzman:Novartis: Employment. Mendelson:Novartis: Employment, Equity Ownership. Zhou:RTI-HS: Employment; Novartis: Research Funding. Copley-Merriman:RTI-HS: Employment; Novartis: Research Funding. Hunter:Incyte Corporation: Employment, Equity Ownership. Levy:Incyte Corporation: Employment, Equity Ownership. Cervantes:Bristol-Myers-Squibb: Speakers Bureau; Novartis: Membership on an entity's Board of Directors or advisory committees, Speakers Bureau. Passamonti:Novartis: Consultancy, Membership on an entity's Board of Directors or advisory committees. Vannucchi:Novartis: Honoraria. Barosi:Novartis: Consultancy.

Effects Of Inhibition Of XPO1/CRM1-Dependent Nuclear Export By Selinexor (KPT-330), Alone and In Combination With Carfilzomib (CFZ), On Apoptosis and Autophagy In Multiple Myeloma (MM)

Blood ◽  
2013 ◽  
Vol 122 (21) ◽  
pp. 279-279 ◽  
Author(s):  
Shaun Rosebeck ◽  
Malathi Kandarpa ◽  
Mattina M. Alonge ◽  
Jagoda Jasielec ◽  
Dominik Dytfeld ◽  
...  
Keyword(s):  
Cell Death ◽  
Cancer Cells ◽  
Board Of Directors ◽  
Nuclear Export ◽  
Research Funding ◽  
Proteasome Inhibition ◽  
Employment Equity ◽  
Advisory Committees ◽  
Nuclear Retention ◽  
Equity Ownership

Abstract Introduction Exportin 1 (XPO1/CRM1) is the sole transporter of most tumor suppressor proteins (TSP) from the nucleus to the cytoplasm. Small molecule selective inhibitors of nuclear export (SINE) block XPO1-mediated nuclear export, leading to nuclear retention of TSP, inducing cancer cell death and sensitizing cancer cells to other cytotoxic drugs. Although the cytotoxic and apoptotic effects of SINE on different cancer cells have now been established, the mechanism of cell death is still not fully understood. Recently, autophagy emerged as a possible cell death pathway and alternate to the ubiquitin-proteasome pathway (UPP) by which excess and/or dysfunctional proteins and organelles are degraded and recycled. MM cells require basal autophagy for survival and caspase 10 protease activity is required to limit autophagic cell death. The possibility that autophagy may be involved in the mechanism of action of SINE is supported by observations that knockdown of XPO1 can promote autophagy and that cytoplasmic p53 can repress autophagy. In this study, we evaluated the contribution of autophagy to the effects of Selinexor (KPT-330), a SINE currently in two phase I clinical trials, on MM cell cytotoxicity. Because proteasome inhibition can also induce autophagy, we hypothesized that the combination of Selinexor and CFZ, a next generation irreversible proteasome inhibitor approved for treatment of MM, may synergistically augment cytotoxicity in MM cells. Methods Plasma cells (PC) were purified from consented MM patient bone marrow aspirates using EasySep (Stem Cell Technology). PC purity (>80%) was determined by Wright-Giemsa staining of cytospins. Human myeloma cell lines (HMCL) NCI-H929, RPMI-8226, MM1.S and MM1.R were cultured in RPMI1640 with 10% FBS. IC50 values were determined using GraphPad Prism. Drug combination efficacy was determined using CalcuSyn (Biosoft). Combination index (CI) values <1.0 indicate synergy. Transcription factor profiling plate array II was from Signosis (Sunnyvale, CA). Otherwise, our studies used standard cellular and molecular biology techniques. Results Selinexor caused significant cytotoxicity in HMCL (IC50 10-100 nM), induced cell cycle arrest in G1, and promoted apoptotic cell death typified by caspase activation, DNA fragmentation, and Annexin V binding. Importantly, purified PC from newly-diagnosed MM patients were also sensitive to the cytotoxic effects of Selinexor. HMCL treated with KPT-330 also exhibited nuclear retention of p53. To gain insight into more global effects of SINE treatment, we assayed DNA binding activity of approx. 100 different transcription factors. TSP, such as Rb, p53, and EGR-1, exhibited increased activity, whereas proto-oncogenes, including NF-κB, Myc, and Myb, were inactivated in response to KPT-330. Western blot analysis of inactivated targets showed nearly total loss of protein. Unlike XPO1, which is degraded via the UPP upon treatment with SINE, loss of Myc and NF-κB subunits, including RelA, RelB, and p52, could not be reversed by proteasome inhibition. Instead, we found that Selinexor treatment induced markers of autophagy, including LC3B induction and processing, and promoted loss of caspase 10, which is associated with autophagic cell death in MM. Importantly, we have determined that the combination of Selinexor and CFZ results in synergistic cell death (CI 0.2-0.6) characterized by enhanced induction of both apoptosis and autophagy in HMCL. The effects of Selinexor and CFZ were also evaluated in NOD-SCID mice inoculated subcutaneously with NCI-H929 cells. Mice were treated 3 times weekly per oswith Selinexor (5 or 10 mg/kg) alone and in combination with twice-weekly IV-administered CFZ (1.5 or 3 mg/kg). After 16 days of treatment, high doses of either CFZ or Selinexor alone moderately inhibit tumor growth. Treatment with the combination of CFZ and Selinexor at all dose levels was more effective than single agent treatment, and high dose combination treatment completely impaired xenograft tumor growth with good tolerability. Conclusion Our studies are the first to suggest that Selinexor-induced cell death correlates with both apoptosis and autophagy, and that both cell death pathways are enhanced in response to combined treatment with CFZ. Overall, our pre-clinical study provides strong rationale for evaluation of Selinexor in combination with CFZ for the treatment of MM. Disclosures: McCauley: Karyopharm Therapeutics Inc.: Employment, Equity Ownership, Patents & Royalties. Shacham:Karyopharm Therapeutics Inc.: Employment, Equity Ownership, Membership on an entity’s Board of Directors or advisory committees, Patents & Royalties. Kauffman:Karyopharm Therapeutics Inc.: Employment, Equity Ownership, Membership on an entity’s Board of Directors or advisory committees, Patents & Royalties. Jakubowiak:BMS: Consultancy, Honoraria, Membership on an entity’s Board of Directors or advisory committees, Research Funding; Celgene: Consultancy, Honoraria, Membership on an entity’s Board of Directors or advisory committees, Research Funding, Speakers Bureau; Janssen-Cilag: Consultancy, Honoraria, Membership on an entity’s Board of Directors or advisory committees, Research Funding; Karyopharm: Research Funding; Millennium: Consultancy, Honoraria, Membership on an entity’s Board of Directors or advisory committees, Research Funding; Novartis: Research Funding; Onyx: Consultancy, Honoraria, Membership on an entity’s Board of Directors or advisory committees, Research Funding, Speakers Bureau.

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