On June 10, 2022 AbbVie (NYSE: ABBV) reported new data from Cohort 3 of its Phase 2 REFINE study of investigational navitoclax in combination with ruxolitinib in JAK inhibitor naïve patients with myelofibrosis (MF), a rare and difficult to treat blood cancer (Press release, AbbVie, JUN 10, 2022, View Source [SID1234615853]). These preliminary findings show spleen volume and symptomatic improvement in this cohort. These data are consistent with previously observed data from relapsed/refractory patients in Cohort 1a1 and will be shared in an oral presentation at the 2022 European Hematology Association (EHA) (Free EHA Whitepaper) Annual Congress (Abstract #S197).2
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REFINE is a Phase 2 non-randomized open-label multi-cohort study evaluating the safety and efficacy of navitoclax alone or in combination with ruxolitinib in MF.
"Current treatment options for myelofibrosis are limited and targeted toward controlling disease symptoms," said Mohamed Zaki, M.D., Ph.D., vice president and global head of oncology clinical development, AbbVie. "Together with pre-clinical findings, early results of this study demonstrating anti-fibrosis activity of navitoclax in combination with ruxolitinib are promising. Specifically, the data findings regarding reduction in spleen volume, symptoms and bone marrow fibrosis help support the further exploration of disease modification in myelofibrosis."
The results presented at EHA (Free EHA Whitepaper) 2022 were from a preliminary analysis of 32 JAK inhibitor naïve MF patients from Cohort 3 of the Phase 2 REFINE trial (NCT03222609).2 The primary endpoint was spleen volume reduction of ≥35 percent (SVR35) from baseline at week 24.2 Key secondary endpoints include ≥50 percent reduction in total symptom score (TSS50) at week 24, anemia response and BMF reduction.2
In the results, SVR35 was achieved by 63 percent of evaluable patients at week 24 (20/32) and by 78 percent at any time on treatment (25/32).2 At week 24, 41 percent (11/27) of evaluable patients with measurable baseline symptoms reached TSS50; notably, 67 percent of patients (18/27) met this endpoint at any time during the study.2 In this cohort, 35 percent of evaluable patients, with available fibrosis grade at baseline and during the study, (9/26) achieved reduction in BMF by ≥1 grade at any time during the study with three patients experiencing ≥2 grade reductions in BMF.2 Additionally, 40 percent of patients evaluable for anemia response (6/15) experienced improvement in anemia, a common clinical feature of MF.2
Preliminary safety analysis identified no new safety signals. Thirty-one (97 percent) patients reported one or more adverse event (AE).1 The most common Grade ≥3 AEs were thrombocytopenia (47 percent), anemia (34 percent), and neutropenia (25 percent).1 Seven patients (22 percent) reported experiencing serious AEs.1 Three patients (9 percent) experienced an AE leading to navitoclax discontinuation and three patients (9 percent) reported an AE leading to ruxolitinib discontinuation.2
"These data reinforce the importance of early intervention in myelofibrosis and the potential to achieve improved clinical outcomes," said Francesco Passamonti, Full Professor of Hematology, University of Insubria and Chief, Hematology, Varee Hospital. "These preliminary results show good responses to combination therapy with navitoclax that may continue to improve over time."
About Navitoclax
Navitoclax is an investigational, oral BCL-XL/BCL-2 inhibitor. The BCL-2 family of proteins are known regulators of the apoptosis pathway.3
Navitoclax is not approved by the U.S. Food and Drug Administration (FDA) or any Health Authority worldwide at this time. Its safety and efficacy are under evaluation as part of ongoing Phase 2 and registrational Phase 3 studies.
AbbVie has an extensive late-stage clinical trial program for investigational navitoclax that is currently enrolling. For more information about enrolling in a clinical trial, please visit us here.
About the REFINE Study
REFINE is a multi-cohort, Phase 2, randomized, open-label, multicenter study evaluating the tolerability and efficacy of navitoclax alone or when added to ruxolitinib in patients with myelofibrosis (MF).4 The primary outcome measure is the percentage of patients who achieve Spleen Volume Reduction of greater than or equal to 35 percent (SVR35) from baseline to Week 24. Secondary outcomes measures include percentage of participants achieving 50 percent reduction in Total Symptom Score from baseline to Week 24 and change in grade of bone marrow fibrosis assessed according to the European Consensus Grading System.
Data presented at EHA (Free EHA Whitepaper) 2022 include preliminary safety and efficacy results from Cohort 3 of REFINE (n=32). Patients in Cohort 3 had primary or secondary MF with splenomegaly and had not received JAK-2 therapy or BET inhibitors prior to enrollment. Data presented at EHA (Free EHA Whitepaper) 2022 are representative of data from Cohort 3 of the REFINE study as of February 7, 2022.
Data included in the official EHA (Free EHA Whitepaper) 2022 Abstract Book are representative of data from Cohort 3 of the REFINE study as of October 4, 2021.
More information can be found on View Source (NCT03222609).
About Myelofibrosis
Myelofibrosis (MF) is a rare, difficult-to-treat blood cancer that results in excessive scar tissue formation (fibrosis) in the bone marrow. Patients living with MF experience symptoms such as an enlarged spleen, fatigue, weakness, and severe anemia, that are often debilitating and greatly impact quality of life. MF also carries a risk of transformation to more aggressive disease such as acute myeloid leukemia.4
About AbbVie in Oncology
At AbbVie, we are committed to transforming standards of care for multiple blood cancers while advancing a dynamic pipeline of investigational therapies across a range of cancer types. Our dedicated and experienced team joins forces with innovative partners to accelerate the delivery of potentially breakthrough medicines. We are evaluating more than 20 investigational medicines in over 300 clinical trials across some of the world’s most widespread and debilitating cancers. As we work to have a remarkable impact on people’s lives, we are committed to exploring solutions to help patients obtain access to our cancer medicines. For more information, please visit View Source