CONCLUSION

In this cohort of nearly 400 patients who received single agent ibrutinib for the front-line treatment of CLL, age did not correlate with response rates, progression-free survival, or overall survival. Nevertheless, a greater than two-fold increase in death was noted in patients ≥65-years-old compared to the younger cohort. Similar to the data reported in the Alliance A041202 study, where the majority of unexplained deaths with ibrutinib occurred within the first two years of treatment, early deaths in our analysis appeared to occur more frequently in the older patient population.1 These data support our initial hypothesis that ibrutinib may be associated with a greater early mortality in an older CLL population.

In this analysis, nearly 50% of the older population required dose interruptions and 20% required dose reductions suggesting issues with drug tolerability related to AEs. Furthermore, it appears that practitioners anticipated an increase in AEs in the older population as they more frequently prescribed lower than standard doses of ibrutinib at initiation of therapy. Alternatively, this may represent decreased experience with the drug in the early days of approval. Despite these findings, the incidence of ibrutinib discontinuation was relatively comparable between the different age groups. Additionally, intolerance to ibrutinib remained the most common reason for discontinuation of therapy in all patients.

When comparing the grade 3–5 adverse events that occurred with ibrutinib in the older Alliance A041202 and younger ECOG E1912 populations, the most notable differences are the increased rates of cardiovascular toxicity, specifically atrial fibrillation (9% vs 3%) and hypertension (29% vs 7%).1,2 A recent retrospective analysis of 562 patients receiving ibrutinib at the Ohio State University also noted a marked incidence of new hypertension of 72%.7 Major cardiac events were noted in 17% of patients and occurred more frequently in those with new or worsening hypertension (19%). In a separate aggregated data set of over 1000 patients receiving ibrutinib, 10 events of sudden death or cardiac arrest were identified.8 The HELIOS study of BR with or without ibrutinib was included in this analysis; 7 events of ≥ grade 3 ventricular arrhythmia, cardiac arrests, and sudden deaths were found in the ibrutinib-containing arm compared to 0 with BR alone.9 The higher incidence of these toxicities raises suspicion for a cardiac event as a potential etiology for the unexplained, early deaths noted in both Alliance A041202 and this analysis; however, investigators were unable to confirm this impression. It is also noted that early death is not necessarily the same as sudden death. Unfortunately, a critical limitation of our analysis is that the individual causes of death were not captured uniformly as part of this retrospective data review, nor were the past cardiac histories. We were unable to identify which, if any, adverse events occurred in patients who experienced an early death or assign attribution to drug. However, given the marked efficacy of ibrutinib and the ability of patients to be effectively salvaged after progression, one may assume that toxicity may be a key contributing factor.


Continue Reading

Given the quickly evolving treatment landscape for CLL, one of the more complicated decisions oncologists will face is determining the most appropriate novel therapeutic for their individual patient. Ibrutinib is certainly a highly effective therapy for patients of all ages, ensuring a lengthy PFS and OS in elderly patients with high-risk disease. However, as the majority of patients with CLL are elderly and many have comorbidities, ensuring tolerability is crucial. While our data are hypothesis generating only, these findings in combination with those of Woyach et al suggest close monitoring of elderly patients treated with ibrutinib is warranted for toxicity, particularly in the first 12 months of therapy.1 In addition, patients should be educated regarding the potential complications related to treatment and symptoms of concern to report.

Fortunately, a number of effective agents have or will become available to patients in the near future. The CLL-14 study of venetoclax and obinutuzumab recently secured the B-cell lymphoma (BCL)-2 inhibitor a role in the front-line setting.10 The safety of venetoclax in an elderly population with comorbidities, including decreased renal function, was demonstrated in this study. However, 5 fatal adverse events were noted during treatment, primarily due to infection, as well as 4 fatal infection events which occurred after completion of venetoclax. The incidence of severe neutropenia was 53% in this study, highlighting the importance in supporting and monitoring patients appropriately both during and after therapy. Additionally, there are second-generation Bruton tyrosine kinase (BTK) inhibitors in development, including acalabrutinib and zanubrutinib, which may be associated with less atrial fibrillation.11,12 Their relative risk of early deaths will be forthcoming with the results of Phase III trials. The combination of a BTK inhibitor and a BCL-2 inhibitor has also demonstrated remarkable efficacy with a shorter required treatment duration and thus less time for drug exposure.13 Whether fixed duration combination strategies will result in less toxicity or early deaths is unknown. Moving forward, although the correlation between age and survival was not shown to be statistically significant, we do feel a greater effort must be focused on understanding whether the cause of early mortality in older patients receiving ibrutinib is related to the drug or the patient; additionally, how best to mitigate this problem which may limit the use of this highly effective agent.

Acknowledgments

This abstract of this paper was presented at the 2019 International Workshop in CLL as a poster presentation with interim findings. https://www.iwcll2019.org/wp-content/uploads/2019/09/iwCLL-Abstract-Titles.pdf

Author Contributions

All authors made a significant contribution to the work reported, whether that is in the conception, study design, execution, acquisition of data, analysis and interpretation, or in all these areas; took part in drafting, revising or critically reviewing the article; gave final approval of the version to be published; have agreed on the journal to which the article has been submitted; and agree to be accountable for all aspects of the work.

no funding for this project There was no funding for this project.

Disclosure

Chaitra Ujjani reports non-financial supports from Pharmacyclics, Abbvie, Genentech, AstraZeneca, and Verastem. Anthony Mato reports grants and personal fees from TG Therapeutics, Celgene, Abbvie, Loxo, Sunesis, Genentech, DTRM, AstraZeneca, Octopharma, Janssen, Regeneron, Adaptive, and Pharmacyclics. Brian T Hill reports grants, personal fees from Pharmacyclics, Abbvie, AstraZeneca. John N Allan reports personal fees from Abbvie, Janssen, Pharmacyclics, Genentech, TG Therapeutics, Verastem, Sunesis, and Ascentage Pharma Group. Frederick Lansigan reports consulting fees from Acrotech and is part of the steering committee for Celgene. Alan Skarbnik is a consultant for Janssen, Pharmacyclics, Abbvie, Celgene, Kite, Alexion, Jazz Pharmaceuticals, and AstraZeneca and received payments for lectures including service on speakers bureaus from Janssen, Pharmacyclics, Abbvie, Celgene, Kite, Alexion, Jazz Pharmaceuticals, AstraZeneca, Beigene, Seattle Genetics, Genentech, and Verastem. Ryan Jacobs reports grants and/or personal fees from Pharmacyclics, Genentech, Abbvie, Verastem, TG Therapeutics, Janssen, Astra Zeneca. John Pagel reports personal fees from Gilead, Beigene, Loxo, and AstraZeneca. Danielle Brander reports grants, non-financial support from AbbVie, ArQule, Ascentage, Astra Zeneca, BeiGene, DTRM, Genentech, Juno/Celgene/BMS, MEI Pharma, Pharmacyclics, Pfizer, Teva, TG Therapeutics, Tolero, Verastem, and memberships with other guidelines/registry memberships (when sponsored or consultant also included under sponsor mentioned): NCCN panel member, informCLL registry steering committee (AbbVie), REAL registry steering committee (Verastem), and Biosimilars outcomes research panel (Pfizer). Bruce Cheson reports personal fees from Abbvie, Pharmacyclics, Celgene, TG Therapeutics, Beigene, AstraZeneca, and Genentech. Paul Barr is consultant for Abbvie, Pharmacyclics, Gilead, Genentech, TG therapeutics, Seattle Genetics, Celgene, Morphosys, Verastem, AstraZeneca, and Janssen. Lindsey Roeker reports family member with minority ownership interest in AbbVie and Abbott Laboratories. Andre Goy reports personal fees from Janssen, Pharmacyclics, during the conduct of the study; as principal investigator for and received funding for institution from Genentech-Hoffman La Roche, including personal fees from Acerta, AstraZeneca, Celgene, Constellation, Infinity, Infinity Verastem, Karyopharm, Kite pharma, Elsevier’s PracticeUpdate Oncology, Gilead, Medscape, MJH Associates, OncLive Peer Exchange, Physcians Education Resource, LLC, Xcenda, and COTA, outside the submitted work. Stephen J Schuster reports personal fees and/or grants from AstraZeneca, Merck, Novartis, Juno/Celgene, Genentech/Roche, Loxo Oncology, Tessa Therapeutics, AlloGene, BeiGene, and Celgene. Dr Nicole Lamanna received research support to institution and advisory board honorarium from Abbvie, Astra Zeneca, Beigene, Genentech, Gilead, Juno, Janssen, Mingsight, Pharmacyclics, TG Therapeutics, Celgene, and Oncternal. Constantine Tam reports personal fees from Abbvie, Janssen, Pharmacyclics. Mazyar Shadman reports personal fees from Abbvie, Genentech, Astra Zeneca, Sound Biologics, Pharmacyclics, Verastem, ADC therapeutics, Beigene, Cellectar, BMS, Mophosys and Atara Biotherapeutics, grants from Mustang Bio, Celgene, Pharmacyclics, Gilead, Genentech, Abbvie, TG therapeutics, Beigene, Astra Zeneca, Sunesis, and Beigene. The authors report no other conflicts of interest in this work.


Chaitra Ujjani, 1 Anthony Mato, 2 Brian T Hill, 3 John N Allan, 4 Frederick Lansigan, 5 Ryan Jacobs, 6 Alan Skarbnik, 7 Hande Tuncer, 8 John Pagel, 9 Danielle Brander, 10 Bruce Cheson, 11 Paul Barr, 12 Lindsey E Roeker, 2 Jeffrey Pu, 13 Nirav N Shah, 14 Andre Goy, 15 Stephen J Schuster, 16 Nicole Lamanna, 17 Alison Sehgal, 18 Constantine S Tam, 19 Mazyar Shadman 1

1Seattle Cancer Care Alliance, Fred Hutchinson Cancer Research Center, Seattle, WA, USA; 2Division of Hematological Oncology, Memorial Sloan Kettering Cancer Center, New York, NY, USA; 3Taussig Cancer Institute, Cleveland Clinic, Cleveland, OH, USA; 4Division of Hematology and Medical Oncology, New York Presbyterian & Weill Cornell, New York, NY, USA; 5Norris Cotton Cancer Center, Dartmouth-Hitchcock Medical Center, Lebanon, NH, USA; 6Department of Hematologic Oncology and Blood Disorders, Levine Cancer Institute, Charlotte, NC, USA; 7Novant Health Cancer Institute, Charlotte, NC 28204, USA; 8Lowell General Hospital, Tufts Medical Center, Boston, MA, USA; 9Center for Blood Disorders and Stem Cell Transplantation, Swedish Cancer Institute, Seattle, WA, USA; 10Division of Hematologic Malignancies and Cellular Therapy, Duke University, Durham, NC, USA; 11Lombardi Comprehensive Cancer Center, Georgetown University Hospital, Washington, DC, USA; 12Wilmot Cancer Institute, University of Rochester Medical Center, Rochester, NY, USA; 13Division of Hematology/Oncology, SUNY Upstate Medical University, Syracuse, NY, USA; 14Division of Hematology & Oncology, Medical College of Wisconsin, Milwaukee, WI, USA; 15John Theurer Cancer Center, Hackensack University Medical Center, Hackensack, NJ, USA; 16Abramson Cancer Center, University of Pennsylvania, Philadelphia, PA, USA; 17Herbert Irving Comprehensive Cancer Center, Columbia University Medical Center, New York, NY, USA; 18University of Pittsburgh Medical Center, Pittsburgh, PA, USA; 19Peter McCallum Cancer Centre, University of Melbourne, East Melbourne, VI, Australia

Correspondence: Chaitra Ujjani
Seattle Cancer Care Alliance, Fred Hutchinson Cancer Research Center, 825 Eastlake Ave E, Mail Stop CE3-300, Seattle, WA, USA
Tel +1 206-606-1955
Fax +1 206-606-1130
Email ujjani@uw.edu


References

1. Woyach JA, Ruppert AS, Heerema N, et al. Ibrutinib regimens versus chemoimmunotherapy in older patients with untreated CLL. N Engl J Med. 2018;379(26):2517–2528. doi:10.1056/NEJMoa1812836

2. Shanafelt TD, Wang XV, Kay NE, et al. Ibrutinib-rituximab or chemoimmunotherapy for chronic lymphocytic leukemia. N Engl J Med. 2019;381(5):432–443. doi:10.1056/NEJMoa1817073

3. Hallek M, Cheson BD, Catovsky D, et al. Guidelines for the diagnosis and treatment of chronic lymphocytic leukemia: a report from the international workshop on chronic lymphocytic leukemia updating the National Cancer Institute-working group 1996 guidelines. Blood. 2008;111(12):5446–5456. doi:10.1182/blood-2007-06-093906

4. Kaplan EL, Meier P. Nonparametric estimation from incomplete observations. J Am Stat Assoc. 1958;53(282):457–481. doi:10.1080/01621459.1958.10501452

5. Anderson P, Gill R. Cox’s regression model for counting processes: a large sample study. Ann Statist. 1982;10(4):1100–1120. doi:10.1214/aos/1176345976

6. Cox DR. Analysis of Survival Data. Routledge; 2018.

7. Dickerson T, Wiczer T, Waller A, et al. Hypertension and incident cardiovascular events following ibrutinib initiation. Blood. 2019;134(22):1919–1928. doi:10.1182/blood.2019000840

8. Lampson B, Yu L, Glynn R, et al. Ventricular arrhythmias and sudden death in patients taking ibrutinib. Blood. 2017;129(18):2581–2584. doi:10.1182/blood-2016-10-742437

9. Chanan-Khan A, Cramer P, Demirkan F, et al. Ibrutinib combined with bendamustine and rituximab compared with placebo, bendamustine, and rituximab for previously treated chronic lymphocytic leukaemia or small lymphocytic lymphoma (HELIOS): a randomised, double-blind, Phase 3 study. Lancet Oncol. 2016;17(2):200–211. doi:10.1016/S1470-2045(15)00465-9

10. Fischer K, Al-Sawaf O, Bahlo J, et al. Venetoclax and obinutuzumab in patients with CLL and coexisting conditions. N Engl J Med. 2019;380(23):2225–2236. doi:10.1056/NEJMoa1815281

11. Awan FT, Schuh A, Brown JR, et al. Acalabrutinib monotherapy in patients with chronic lymphocytic leukemia who are intolerant to ibrutinib. Blood Adv. 2019;3(9):1553–1562. doi:10.1182/bloodadvances.2018030007

12. Tam C, Trotman J, Opat S, et al. Phase 1 study of the selective BTK inhibitor zanubrutinib in B-cell malignancies and safety and efficacy evaluation in CLL. Blood. 2019;134(11):851–859. doi:10.1182/blood.2019001160

13. Wierda W, Siddiqi T, Flinn I, et al. Phase 2 CAPTIVATE results of ibrutinib plus venetoclax in first-line chronic lymphocytic leukemia. J Clin Oncol. 2018;36(15_suppl):Abstract 7502. doi:10.1200/JCO.2018.36.15_suppl.7502

Source: Blood and Lymphatic Cancer: Targets and Therapy.
Originally published August 24, 2020.

READ FULL ARTICLE Curated publisher From Dovepress