A DOSE-ESCALATION STUDY OF THE BCL-2 INHIBITOR VENETOCLAX (ABT-199/GDC-0199) PLUS BENDAMUSTINE (B) AND RITUXIMAB (R) IN PATIENTS WITH RELAPSED/REFRACTORY (R/R) NON-HODGKIN?S LYMPHOMA (NHL)
Author(s): ,
Sven de Vos
Affiliations:
Department of Medicine,University of California Los Angeles,Los Angeles,United States
,
Christopher Flowers
Affiliations:
Winship Cancer Institute,Emory University,Atlanta,United States
,
Ding Wang
Affiliations:
Hematology/Oncology,Henry Ford Hospital,Detroit,United States
,
Lode Swinnen
Affiliations:
Johns Hopkins University,Baltimore,United States
,
Nathan Fowler
Affiliations:
The University of Texas MD Anderson Cancer Center,Houston,United States
,
Erin Reid
Affiliations:
University of California San Diego,La Jolla,United States
,
Jaclyn Cordero
Affiliations:
AbbVie,North Chicago,United States
,
Maryella Gifford
Affiliations:
AbbVie,North Chicago,United States
,
Diane D'Amico
Affiliations:
AbbVie,North Chicago,United States
,
Martin Dunbar
Affiliations:
AbbVie,North Chicago,United States
,
Ming Zhu
Affiliations:
AbbVie,North Chicago,United States
,
Ahmed Salem
Affiliations:
AbbVie,North Chicago,United States
,
Sari H. Enschede
Affiliations:
AbbVie,North Chicago,United States
,
Justin L. Ricker
Affiliations:
AbbVie,North Chicago,United States
,
David Chien
Affiliations:
AbbVie,North Chicago,United States
,
Rod Humerickhouse
Affiliations:
AbbVie,North Chicago,United States
Mark Kozloff
Affiliations:
Ingalls Hospital,Harvey,United States
EHA Learning Center. deVos S. Jun 12, 2015; 103123
Sven deVos
Sven deVos

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Abstract
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Abstract: S109

Type: Oral Presentation

Presentation during EHA20: From 12.06.2015 12:15 to 12.06.2015 12:30

Location: Room A7

Background
Venetoclax is a selective, potent, orally bioavailable BCL-2 inhibitor that has shown single agent activity in patients with R/R NHL. The current study evaluates venetoclax in combination with an immunochemotherapy regimen, BR, an active regimen widely used to treat patients with NHL.

Aims
The primary objectives were to assess safety, pharmacokinetics (PK), and determine the maximum tolerated dose (MTD) and recommended Phase 2 dose of the combination. Secondary objectives evaluated preliminary efficacy. 

Methods
Dose escalation used a 3+3 design on a 28 day (d) cycle (C) with 3 venetoclax schedules: 3, 7, and 28 d/C. The BR regimen was 6 C: B (2 d/C, 90mg/m2) and R (1 d/C, 375mg/m2). DLTs for dose escalation were assessed during C1. Responses were first assessed on C3 d1. Patients who completed venetoclax + BR with continued tolerability and without disease progression could continue venetoclax monotherapy up to 2 yrs. 

Results
As of January 9 2015, 33 patients were treated: 20 (61%) FL, 10 (30%) DLBCL, and 3 (9%) MZL. The median age was 62 (29-90) yrs. All had prior R or R-combination, of which 32 (97%) had R-based chemotherapy and 8 (24%) had prior B or BR. Sixteen (48%) patients are active; 17 discontinued (12 PD, 2 AE, 1 withdrew consent, 1 non-compliance, and 1 completed the induction regimen). Median time on study was 90 d (1–876); 15 (45%) completed 6 C of the combination. The most common AEs (in >25%) were nausea (58%), anemia, neutropenia (each 42%), thrombocytopenia, diarrhea (each 39%), hyperglycemia (36%), and vomiting, hypokalemia, fatigue (each 27%). The most common grade 3/4 AEs (in >10%) were neutropenia (30%), leukopenia, thrombocytopenia, lymphopenia (each 21%), and anemia (18%). The most frequent SAE was febrile neutropenia (9%). There were no drug-related AEs that led to death. DLTs are summarized in the table. Preliminary PK results suggest that co-administration of BR did not significantly impact venetoclax PK. Twenty-nine patients were evaluable for objective response: 6 (21%) CR and 13 (45%) PR. The ORR was 66% in all patients and 74% in patients with FL.

Summary
Preliminary data demonstrate a tolerable safety profile of venetoclax + BR. Early responses were seen across all cohorts in this heavily pretreated patient population. The MTD has not been reached; cohort 9 is enrolling at 600 mg 28 d/C.  

Keyword(s): BCL2, Diffuse large B cell lymphoma, Follicular lymphoma, Non-Hodgkin's lymphoma



Session topic: Treatment and outcome in non-Hodgkin lymphomas
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