novel treatment options for waldenstrom macroglobulinemia
DESCRIPTION
Novel treatment options for Waldenstrom Macroglobulinemia. Irene Ghobrial, MD Associate Professor of Medicine Harvard Medical School Dana Farber Cancer Institute Boston, MA. Ghobrial et al, Lancet Oncol 2004, Treon et al, Blood 2009. MYD88 in WM. Treon et al, NEJM 2012. - PowerPoint PPT PresentationTRANSCRIPT
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Novel treatment options for Waldenstrom
Macroglobulinemia
Irene Ghobrial, MD
Associate Professor of Medicine
Harvard Medical School
Dana Farber Cancer Institute
Boston, MA
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Ghobrial et al, Lancet Oncol 2004, Treon et al, Blood 2009
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MYD88 in WM
Treon et al, NEJM 2012
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Molecular characteristics
• 30-50% of patients: deletion 6q by FISH• BLIMP (on 6q21): a tumor-suppressor gene, is the
master gene regulator for B-lymphocytic cell proliferation.
• 70-90% of patients have MYD88 mutation.• CXCR4 somatic mutation in 24% of samples
Treon et al NEJM 2012
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Consensus recommendations of the 4th International WM meeting
• First Line therapy:– Combination therapy
• (RCD or CPR; Cytoxan+nucleoside analogues+R; R-CHOP, R-CVP)
– Rituximab single agent– Nucleoside analogues– Alkylators
• Salvage therapy:– Re-use therapies– Bortezomib– Thalidomide+steroids– Alemtuzumab– AHSCT
Dimopoulos, JCO 2009, Treon et al Clin Lymph and Myeloma 2009
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Primary Therapy of WM with Rituximab-Based Options
Regimen ORR CR
Rituximab x 4 25-30% 0%
Rituximab x 8 40-45% 0%
Rituximab/cyclophosphamide i.e. CHOP-R, CVP-R, CPR, RCD
70-80% 8-10%
Rituximab/nucleoside analoguesi.e. FR, FCR, CDA-R
70-90% 5-10%
Rituximab/thalidomide 70% 5%
Rituximab/bortezomib i.e. BDR, VR
70-90% 10-25%
Rituximab/bendamustine 90% NA
Courtesy of Dr. Steven Treon
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Primary treatment of Waldenström macroglobulinemia with dexamethasone, rituximab,
and cyclophosphamide.
• 72 patients• cyclophosphamide 100 mg/m2 orally bid on days 1 to
5 (total dose, 1,000 mg/m2). • 83% of patients achieved a response• Including 7% complete, 67% partial, and 9% minor
responses. • The median time to response was 4.1 months. • The 2-year progression-free survival rate for all
patients was 67%
Dimopoulos, JCO 2007
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Bendamustine plus Rituximab versus CHOP plus Rituximab in the First-Line- Treatment of Patients with Waldenstrom
disease: Randomized Phase III Study of the Studygroup Indolent Lymphomas (StiL)
Rummel, WM-Workshop2012
•42 pts with WM, report on 40 evaluable in interim analysis, BR=23 and CHOP-R=17.
•The ORR for pts treated with B-R was similar to that associated with CHOP-R (96% vs 94%, respectively).
•The median follow-up time for both groups is 26 months.
•Progressive or relapsed disease: 2 in pts treated with B-R and 7 in the CHOP-R group.
•Less toxicity and non-inferior response.
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PFS: Benda-R vs CHOP-R in Frontline WM
0 12 24 36 48 60 72
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
months
Pro
bab
ilit
y
Bendamustine-R
CHOP-R
Rummel M, et al. Presented at: Third International Pt Physic Summit on WM; May 1-3, 2009; Boston, Massachusetts, United States.
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Phase II trial of bortezomib+ rituximab in upfront or R/R WM
•A total of 6 cycles, a cycle= 28 days
•No rituximab maintenance
•No dexamethasone
•ORR 80-90%. CR 10-15%
•Minimal peripheral neuropathy
Ghobrial et al, JCO 2010
Ghobrial et al, AJH 2011
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New developments
PI3K/mTOR inhibitors
Proteasome inhibitors
BTK inhibitors
HDAC inhibitors
IMIDs
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The PI3K/mTOR pathway
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Phase II trial of RAD001 in WM
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Par
tial
res
po
nse
Par
tial
res
po
nse
Sta
ble
dis
ease
A
B
C
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Phase I/II Study of Everolimus, Bortezomib and/or Rituximab in Relapsed/Refractory WM
Registration
Determine maximum tolerated dose (MTD)
Study Design
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The RVR phase I study
Response N= 23 evaluable
CR 1 (5%)
PR 7 (30%)MR 9 (39%)ORR (CR+PR+MR) 17 (74%)Stable Disease 6 (26%)
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MLN128• TORC1 and 2 inhibitor
• Oral agent before after 6 months
Maiso, Blood 2010
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Targeting PKC in WM
Phase II study
38% ORR in 42 patients relapsed/ref
Ghobrial, CCR 2012
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Phase II trial of perifosine in patients with relapsed/refractory WM
•ORR 35%, with another 54% showing stabilization of their disease
•Only 11% of patients demonstrated progression.
Ghobrial et al, CCR 2010
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CAL-101PI3K delta (p110)OralWell toleratedSignificant Lymph node response but
increase in peripheral blood lymphocytes in CLL
60% ORR in indolent lymphomas, 86% in MCL, 95% ORR in CLL in lymph nodes
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Roccaro et al, Blood 2011
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New Proteasome inhibitors
Upfront therapy with Carfilzomib/dex/rituxan (CARD study)
Onyx 0912 in relapsed WM
Roccaro et al, Blood 2010Sacco et al, CCR 2011
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IMIDs in WM• Thalidomide and rituximab:
– Thalidomide 200-400 mg, rituximab weeks 2-5, 13-16– 25 pts (20 untreated)– 70% ORR– TTP ≥38 months observed among responders. – 44% >G2 PN
• Lenalidomide and rituximab: – 25 mg lenalidomide 21 days, and rituximab weeks 2-5, 13-16– 16 pts (12 untreated)– 50% response rate, TTP of 18.9 months– 88% discontinuation of therapy– Most due to anemia that occurred early with therapy– Median decrease in Hct from 32 to 27%, 4 pts required hospitalization
• Phase I trials of lenalidomide ongoing, phase I pomalidomide/rituximab ongoing.
Treon et al, Blood 2008, CCR 2008
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Phase II Study of Panobinostat in WM
Ghobrial I, et al. Blood. 2010;116:3952.[Oral Presentation].
Best overall response
N %
CR 0 0
VGPR 1 3
PR 10 27
MR 9 25
SD 14 39
PD 1 3
Unevaluable 1 3
Total 36
PR or better11
30(90%CI:18, 46)
MR or better20
55 (90%CI:41,70)
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IgM response to Panobinostat
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Bruton’s Tyrosine Kinase (BTK)
Nat Rev Imm 2:945
• B-cell antigen receptor (BCR) signaling is required for tumor expansion and proliferation
• Bruton’s Tyrosine Kinase (Btk) is an essential element of the BCR signaling pathway
• Inhibitors of Btk block BCR signaling and induces apoptosis
IgM
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Ibrutinib
• Breakthrough designation by the FDA for WM.
• Over 80% response rate.
• Very well tolerated.
• Currently, no trials available. Awaiting approval and more trials or expanded access in the next few months.
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New Proteasome inhibitors
Oprozomib in relapsed WM
Roccaro et al, Blood 2010Sacco et al, CCR 2011
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Oprozomib
• Oral agent.• Proteasome inhibitor without neuropathy.• Over 80% response rate so far in WM• Considering breakthrough designation in
WM.• Study open in multiple sites and accruing
now.
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Future developments
• MYD88 targeting (IRAK4)
• CXCR4 targeting
• miRNA155 targeting (MiRNA LNA)
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miRNA expression in bone marrow CD19+ WM cells vs CD19+ normal counterpart
Roccaro et al. Blood 2009
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P = .009
P = .001
P = .004
Association between microRNAs and clinical prognostic features
Roccaro et al. Blood 2009
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Summary Significant advances in WM specifically MYD88
miRNA155 as a prognostic maker and therapeutic target
New agents including mTOR inhibitors, BTK inhibitors, PI3K inhibitors, HDAC inhibitors, new proteasome inhibitors
Can we personalize therapy in WM?
Should we treat earlier to prevent complications/clonal heterogeneity and resistance
FDA approval for agents in WM
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Acknowledgement
• Ken Anderson, MD, Steven Treon, MD, Paul Richardson, MD, Nikhil Munshi, MD, Jacob Laubach, MD, Claudia Paba-Prada, MD
• Supported by the NIH, FDA, IWMF, LLS, Kirsch Lab for WM, Heje Fellowship, All our patients.