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• W3096316159 abstract "Background: Ibrutinib (I) and venetoclax (V) have each demonstrated modest single-agent activity in relapsed/refractory follicular lymphoma (FL) (Gopal A, JCO 2018; Davids M, JCO 2017). Preclinical data have shown synergy with these agents in B-cell cell lines (Kuo H, Mol Cancer Ther 2017). Based on these observations, we proposed the first trial to combine I and V in FL. Results from the phase Ib portion of this multi-institutional investigator-initiated trial are presented here (NCT02956382). Methods: This phase Ib/II trial is open at Georgetown/Lombardi CCC, Hackensack/John Theurer CC, and University of Washington/Fred Hutchinson/Seattle Cancer Care Alliance. Eligibility criteria include WHO grade 1-3a FL, &gt;1 prior systemic therapy, measurable disease warranting therapy by standard criteria or physician discretion, ECOG performance status &lt; 2, adequate marrow, hepatic, renal function. Patients (pts) were enrolled in a standard phase I 3+3 design at a starting dose level (DL) of I 420 mg daily, V 400 mg daily (DL0). The highest initially planned dose level was DL3: I 560 mg daily, V 800 mg daily. There was no dose ramp up of V based on monotherapy experience in FL. Pts at high risk for tumor lysis syndrome (TLS), defined as node ≥ 8 cm and/or significant lymphocytosis, were hospitalized for initial dose. Pts received study drugs until progression or unacceptable toxicity. Response was assessed by PET-CT and bone marrow biopsy (if marrow involvement present at time of enrollment). Results: Sixteen pts were enrolled between November 2017 - May 2020. Median age was 66 years (range 50-87); 75% were male; 75% were Stage III/IV, 94% had WHO grade 1/2 FL (Table 1). FLIPI score at enrollment was 25% low risk, 44% intermediate risk, 31% high risk. Two pts were considered high risk for TLS. Pts received a median of 2 prior therapies (range 1-8); 19% were refractory to last line of therapy. Cohort enrollment was: DL0 (n=3), DL1 (n=6), DL2 (n=6), DL3 (n=1). The protocol was amended to close DL3 based on pharmacokinetic data from DL2 indicating a 1.8-fold higher mean steady-state ibrutinib plasma exposure compared to ibrutinib 560 mg monotherapy and concern for potential toxicity. Grade 3 adverse events (AE) included neutropenia (25%), thrombocytopenia (13%), lung infection (13%), upper respiratory infection (6%), neutropenic fever (6%), atrial fibrillation (6%), ALT/AST elevations (6%), mucositis (6%), failure to thrive in setting of progression (6%), abdominal pain (6%). There were no grade 4/5 AE. Grade 1/2 AE occurring in &gt; 20% of pts included diarrhea (75%), nausea (63%), bruising (38%), rash (31%), headache (31%), constipation (25%), fatigue (25%). There was no evidence of clinical TLS; 19% had grade 1 hyperuricemia. The pt enrolled at DL3 had grade 1 diarrhea, grade 1 neutropenia. One dose limiting toxicity (DLT) occurred at DL1 (I 560 mg, V 400 mg): grade 3 neutropenia with fever and infection. There were no other DLTs. Therefore, DL2 (I 560 mg, V 600 mg) was determined to be the recommended phase 2 dose (RP2D). The ORR was 69% (0.413, 0.890); CR 25% (0.073, 0.524). The ORR at the RP2D was 83% (CR 33%). Responses by dose level are listed in Table 2. The regimen demonstrated activity in the bone marrow; 2 pts had eradication of involvement and 1 had a decrease from 60% to 0.5% by flow cytometry. Response by lines of prior therapy: 1 (86%, 6/7), &gt; 2 (56%, 5/9). Most pts (91%) had a response by time of first assessment (12 weeks). The median progression-free survival (PFS) was 8.3 months (5.6 months, NA) (Figure 1). Of note, 2 responding pts chose to withdraw from study due to travel and were censored in the PFS analysis at time of discontinuation. One remained in a CR at least 9 months after study withdrawal as documented by PET-CT performed off protocol. No pts discontinued due to toxicity. Conclusion: In the first clinical trial to combine a BTK inhibitor and a BCL-2 inhibitor in relapsed/refractory FL, we found the I-V doublet to demonstrate a toxicity profile similar to that seen in mantle cell lymphoma and CLL. While our sample size is small, there was no evidence of clinical TLS, despite omission of the V ramp up. Preliminary results of anti-tumor activity are encouraging and further evaluation at the RP2D (I 560 mg, V 600 mg) is ongoing in the phase II trial. The combination of ibrutinib and venetoclax may provide an effective option for FL, utilizing a targeted approach distinct from other novel agents currently approved for this malignancy. Disclosures Ujjani: Verastem Oncology: Consultancy, Honoraria; Genentech: Consultancy, Honoraria; MorphoSys: Consultancy; Atara: Consultancy, Honoraria; AstraZeneca: Consultancy, Honoraria, Research Funding; Abbvie: Consultancy, Honoraria, Research Funding; Gilead/Kite: Consultancy, Research Funding. Lai:Agios: Consultancy; Macrogenics: Consultancy; Astellas: Speakers Bureau; Jazz: Speakers Bureau; Abbvie: Consultancy. Leslie:Seattle Genetics: Consultancy, Membership on an entity's Board of Directors or advisory committees, Speakers Bureau; KitePharma: Consultancy, Membership on an entity's Board of Directors or advisory committees, Speakers Bureau; BMS: Speakers Bureau; Celgene: Speakers Bureau; BeiGene: Honoraria, Speakers Bureau; Pharmacyclics: Consultancy, Membership on an entity's Board of Directors or advisory committees, Speakers Bureau; Janssen: Consultancy, Membership on an entity's Board of Directors or advisory committees, Speakers Bureau; AstraZeneca: Consultancy, Membership on an entity's Board of Directors or advisory committees, Speakers Bureau; Epizyme: Honoraria, Speakers Bureau; Karyopharm: Honoraria, Speakers Bureau; Bayer: Consultancy, Membership on an entity's Board of Directors or advisory committees; ADC therapeutics: Consultancy, Membership on an entity's Board of Directors or advisory committees; AbbVie: Consultancy, Membership on an entity's Board of Directors or advisory committees; TG Therapeutics: Consultancy, Membership on an entity's Board of Directors or advisory committees. Broome:sanofi: Honoraria; argenx: Honoraria; apellis: Honoraria; Alexion: Honoraria. Gopal:IgM bio, BMS, merck: Research Funding; imab bio, takeda,astrazeneca,gilead: Research Funding; Seattle Genetics; Janssen; IMab Bio; TG Therapeutics; Astra Zeneca; Merck; Gilead; ADC Therapeutics; Nurix; TG therapeutics, Cellectar; Actinium: Consultancy; Seattle Genetics; Janssen; Takeda; IgM Bio; IMab Bio; BMS; Astra Zeneca; Merck; Gilead: Research Funding. Smith:Beigene: Consultancy; Millenium/Takeda: Consultancy; AstraZeneca: Consultancy; Portola: Research Funding; Seattle Genetics: Research Funding; Pharmacyclics: Research Funding; Merck: Research Funding; Incyte: Research Funding; Ignyta: Research Funding; Genentech: Research Funding; De Novo Biopharma: Research Funding; Bristol Meyers Squibb: Research Funding; Ayala: Research Funding; Acerta Pharma BV: Research Funding; AstraZeneca: Research Funding; Bayer: Research Funding; Karyopharm: Consultancy. Till:Mustang: Patents & Royalties, Research Funding. Lynch:Morphosys: Consultancy; Takeda: Research Funding; Bayer: Research Funding; TG therapeutics: Research Funding; Incyte: Research Funding; Juno: Research Funding; Cyteir: Research Funding; Genentech: Research Funding; Rhizen: Research Funding. Shadman:Genentech: Consultancy, Membership on an entity's Board of Directors or advisory committees, Research Funding; TG therapeutics: Research Funding; Celgene: Research Funding; Sunesis: Research Funding; Gilead: Research Funding; AstraZeneca: Consultancy, Membership on an entity's Board of Directors or advisory committees, Research Funding; Bristol Meyers Squibb: Consultancy, Membership on an entity's Board of Directors or advisory committees; Verastem: Consultancy, Membership on an entity's Board of Directors or advisory committees; ADC Therapeutics: Consultancy, Membership on an entity's Board of Directors or advisory committees; Atara Biotherapeutics: Consultancy, Membership on an entity's Board of Directors or advisory committees; AbbVie: Consultancy, Membership on an entity's Board of Directors or advisory committees, Research Funding; Cellectar: Consultancy, Membership on an entity's Board of Directors or advisory committees; Pharmacyclics: Consultancy, Membership on an entity's Board of Directors or advisory committees, Research Funding; Mustang Bio: Research Funding; BeiGene: Consultancy, Membership on an entity's Board of Directors or advisory committees, Research Funding; Acerta Pharma: Ended employment in the past 24 months; MophoSys: Consultancy, Membership on an entity's Board of Directors or advisory committees; Sound Biologics: Consultancy, Membership on an entity's Board of Directors or advisory committees. Maloney:Novartis: Consultancy, Honoraria; Bioline Rx: Consultancy, Honoraria; Juno Therapeutics: Consultancy, Honoraria, Patents & Royalties: Patents are pending, but not issued, licensed, no royalties, no licensees., Research Funding; A2 Biotherapeutics: Consultancy, Current equity holder in publicly-traded company, Honoraria; Celgene: Consultancy, Honoraria, Research Funding; Kite, a Gilead Company: Consultancy, Honoraria, Research Funding; Gilead Sciences: Consultancy, Honoraria; Amgen: Consultancy, Honoraria; MorphoSys: Consultancy, Honoraria; Genentech: Consultancy, Honoraria; Pharmacyclics: Consultancy, Honoraria. Cheson:TG Therapeutics: Speakers Bureau; Symbio: Membership on an entity's Board of Directors or advisory committees; Kite: Consultancy; Karyopharm: Consultancy, Membership on an entity's Board of Directors or advisory committees; Morphosys: Consultancy; Trillium: Research Funding; Abbvie: Consultancy, Research Funding; Jannsen: Consultancy; Pharmacyclics: Consultancy, Research Funding; Parexel: Consultancy; GSK: Membership on an entity's Board of Directors or advisory committees. OffLabel Disclosure: We are presenting data regarding the use of venetoclax and ibrutinib in follicular lymphoma." @default.
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• W3096316159 title "Ibrutinib and Venetoclax in Relapsed and Refractory Follicular Lymphoma" @default.
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