Richter Transformation in the Canadian Landscape: Clinical Perspectives and Emerging Trends

Authors

  • Jean-Nicolas Champagne, MD, FRCPC Department of Hematology and Medical Oncology, Hôpital Sacré-Coeur de Montréal, Montreal, QC.
  • Alina S. Gerrie, MD, MPH, FRCPC Divisions of Medical Oncology and Hematology, Centre for Lymphoid Cancer, University of British Columbia and BC Cancer, Vancouver, BC

DOI:

https://doi.org/10.58931/cht.2025.4163

Abstract

Over the past decade, the treatment landscape for chronic lymphocytic leukemia (CLL) and its lymphoma counterpart, small lymphocytic lymphoma (SLL), has evolved significantly. The shift from chemoimmunotherapy (CIT) to the increased use of targeted agents, such as Bruton’s tyrosine kinase inhibitors (BTKi) and B-cell lymphoma 2 inhibitors (BCL2i), has led to marked improvements in patient outcomes. Despite these advancements, some patients still experience disease transformation to a more aggressive histology known as Richter Transformation (RT), and the clinical outcomes with this histology remain dismal, with median overall survival (OS) typically shorter than one year. Therefore, RT represents a significant unmet need for patients with CLL/SLL. This review describes recent advances in the understanding and management of RT within the Canadian landscape, focusing on transformation to diffuse large B-cell lymphoma (DLBCL).

Author Biographies

Jean-Nicolas Champagne, MD, FRCPC, Department of Hematology and Medical Oncology, Hôpital Sacré-Coeur de Montréal, Montreal, QC.

Dr. Champagne obtained his medical degree and completed his internal medicine residency at Université Laval, in Québec City. He completed dual specialties at Université de Montréal, graduating in hematology and medical oncology in 2023. He received the Royal College Detweiler Traveling Fellowship to pursue his training in lymphoproliferative disease at BC Cancer in Vancouver. He is now practicing at Hôpital du Sacré-Coeur de Montréal, where he focuses on malignant hematology, especially lymphoma.

Alina S. Gerrie, MD, MPH, FRCPC, Divisions of Medical Oncology and Hematology, Centre for Lymphoid Cancer, University of British Columbia and BC Cancer, Vancouver, BC

Dr. Alina Gerrie is a hematologist and Associate Professor in the Divisions of Medical Oncology and Hematology at the University of British Columbia (UBC) and a Clinician Investigator at the Centre for Lymphoid Cancer at BC Cancer, Vancouver Centre. She completed her medical degree and internal medicine residency at the University of Toronto, followed by hematology residency at UBC. She undertook a fellowship through the Royal College Clinical Investigator Program and earned a Master of Public Health degree from Harvard University, where her research included investigating the impact of genetic abnormalities on population-level outcomes in chronic lymphocytic leukemia (CLL) patients. Dr. Gerrie currently holds a Michael Smith Health Research Investigator Award and is involved in translational, clinical trial and outcomes-based research related to leukemia and lymphoma. Other academic interests include the investigation of novel therapeutics and cellular therapy for CLL and lymphoma.

References

Muthiah C, Narra R, Atallah E, Juan W, Szabo A, Guru Murthy GS. Evaluating population-level outcomes in Chronic Lymphocytic leukemia in the era of novel therapies using the SEER registry. Leukemia Research. 2024;140:107496. DOI: https://doi.org/10.1016/j.leukres.2024.107496

Al-Sawaf O, Robrecht S, Bahlo J, Fink AM, Cramer P, v Tresckow J, et al. Richter transformation in chronic lymphocytic leukemia (CLL)—a pooled analysis of German CLL Study Group (GCLLSG) front line treatment trials. Leukemia. 2021;35(1):169-76. DOI: https://doi.org/10.1038/s41375-020-0797-x

Walker SK, Harrop S, Di Ciaccio P, Lewis KL, Boles R, Tedjaseputra A, et al. Real World Data on the Outcomes of Richter's Transformation of Chronic Lymphocytic Leukemia and Small Lymphocytic Lymphoma in the Australian Population: An Australasian Lymphoma Alliance Study. Blood. 2021;138:1455. DOI: https://doi.org/10.1182/blood-2021-147146

Lortholary P, Boiron M, Ripault P, Levy JP, Manus A, Bernard J. [CHRONIC LYMPHOID LEUKEMIA SECONDARILY ASSOCIATED WITH A MALIGNANT RETICULOPATHY: RICHTER'S SYNDROME]. Nouv Rev Fr Hematol. 1964;4:621-44.

Ahn IE, Farooqui MZH, Tian X, Valdez J, Sun C, Soto S, et al. Depth and durability of response to ibrutinib in CLL: 5-year follow-up of a phase 2 study. Blood. 2018;131(21):2357-66. DOI: https://doi.org/10.1182/blood-2017-12-820910

Byrd JC, Hillmen P, Ghia P, Kater AP, Chanan-Khan A, Furman RR, et al. Acalabrutinib Versus Ibrutinib in Previously Treated Chronic Lymphocytic Leukemia: Results of the First Randomized Phase III Trial. Journal of Clinical Oncology. 2021;39(31):3441-52. DOI: https://doi.org/10.1200/JCO.21.01210

Hampel PJ, Rabe KG, Wang Y, Hwang SR, Kenderian SS, Muchtar E, et al. Incidence of Richter transformation of chronic lymphocytic leukemia/small lymphocytic lymphoma in the targeted therapy era. Leukemia. 2025;39(2):503-7. DOI: https://doi.org/10.1038/s41375-024-02492-4

Ryan CE, Davids MS. Practical Management of Richter Transformation in 2023 and Beyond. American Society of Clinical Oncology Educational Book. 2023(43):e390804. DOI: https://doi.org/10.1200/EDBK_390804

Michallet A-S, Sesques P, Rabe KG, Itti E, Tordot J, Tychyj-Pinel C, et al. An 18F-FDG-PET maximum standardized uptake value > 10 represents a novel valid marker for discerning Richter’s Syndrome. Leukemia & Lymphoma. 2016;57(6):1474-7. DOI: https://doi.org/10.3109/10428194.2015.1099643

Mato AR, Wierda WG, Davids MS, Cheson BD, Coutre SE, Choi M, et al. Utility of positron emission tomography-computed tomography in patients with chronic lymphocytic leukemia following B-cell receptor pathway inhibitor therapy. Haematologica. 2019;104(11):2258-64. DOI: https://doi.org/10.3324/haematol.2018.207068

Alaggio R, Amador C, Anagnostopoulos I, Attygalle AD, Araujo IBdO, Berti E, et al. The 5th edition of the World Health Organization Classification of Haematolymphoid Tumours: Lymphoid Neoplasms. Leukemia. 2022;36(7):1720-48. DOI: https://doi.org/10.1038/s41375-022-01620-2

Zhu K, Jamroz A, Huang S, Villa D, Freeman CL, Scott DW, et al. Outcomes of Hodgkin variant Richter transformation in chronic lymphocytic leukaemia and small lymphocytic lymphoma in British Columbia. Br J Haematol. 2022;198(4):684-92. DOI: https://doi.org/10.1111/bjh.18241

Barnea Slonim L, Ma S, Behdad A, Chen Q. Pseudo-Richter transformation of chronic lymphocytic leukaemia/small lymphocytic lymphoma following ibrutinib interruption: a diagnostic pitfall. Br J Haematol. 2020;191(1):e22-e5. DOI: https://doi.org/10.1111/bjh.16948

Champagne J-N, Huang S, Ramadan R, Venner CP, Ramadan K, Sehn LH, et al. Richter Transformation (RT) in Chronic Lymphocytic Leukemia (CLL) and Small Lymphocytic Lymphoma (SLL): A Comparison of Two Eras. Blood. 2024;144(Supplement 1):5095-. DOI: https://doi.org/10.1182/blood-2024-198028

Parry EM, ten Hacken E, Wu CJ. Richter syndrome: novel insights into the biology of transformation. Blood. 2023;142(1):11-22. DOI: https://doi.org/10.1182/blood.2022016502

Nadeu F, Royo R, Massoni-Badosa R, Playa-Albinyana H, Garcia-Torre B, Duran-Ferrer M, et al. Detection of early seeding of Richter transformation in chronic lymphocytic leukemia. Nature medicine. 2022;28(8):1662-71. DOI: https://doi.org/10.1038/s41591-022-01927-8

He R, Ding W, Viswanatha DS, Chen D, Shi M, Van Dyke D, et al. PD-1 Expression in Chronic Lymphocytic Leukemia/Small Lymphocytic Lymphoma (CLL/SLL) and Large B-cell Richter Transformation (DLBCL-RT): A Characteristic Feature of DLBCL-RT and Potential Surrogate Marker for Clonal Relatedness. The American Journal of Surgical Pathology. 2018;42(7):843-54. DOI: https://doi.org/10.1097/PAS.0000000000001077

Behdad A, Griffin B, Chen Y-H, Ma S, Kelemen K, Lu X, et al. PD-1 is highly expressed by neoplastic B-cells in Richter transformation. British Journal of Haematology. 2019;185(2):370-3. DOI: https://doi.org/10.1111/bjh.15514

Tsimberidou A-M, O'Brien S, Khouri I, Giles FJ, Kantarjian HM, Champlin R, et al. Clinical Outcomes and Prognostic Factors in Patients With Richter's Syndrome Treated With Chemotherapy or Chemoimmunotherapy With or Without Stem-Cell Transplantation. Journal of Clinical Oncology. 2006;24(15):2343-51. DOI: https://doi.org/10.1200/JCO.2005.05.0187

Kittai AS, Huang Y, Miller S, Allan JN, Bhat SA, Bond DA, et al. Outcomes of Patients with Richter Transformation without Prior Chemoimmunotherapy for CLL/SLL: An International Multicenter Retrospective Study. Blood. 2023;142(Supplement 1):497-. DOI: https://doi.org/10.1182/blood-2023-182114

Rossi D, Spina V, Deambrogi C, Rasi S, Laurenti L, Stamatopoulos K, et al. The genetics of Richter syndrome reveals disease heterogeneity and predicts survival after transformation. Blood. 2011;117(12):3391-401. DOI: https://doi.org/10.1182/blood-2010-09-302174

Mao Z, Quintanilla-Martinez L, Raffeld M, Richter M, Krugmann J, Burek C, et al. IgVH Mutational Status and Clonality Analysis of Richter's Transformation: Diffuse Large B-cell Lymphoma and Hodgkin Lymphoma inAssociation With B-cell Chronic Lymphocytic Leukemia (B-CLL) Represent 2 Different Pathways of Disease Evolution. The American Journal of Surgical Pathology. 2007;31(10):1605-14. DOI: https://doi.org/10.1097/PAS.0b013e31804bdaf8

Negara I, Tomuleasa C, Buruiana S, Efremov DG. Molecular Subtypes and the Role of TP53 in Diffuse Large B-Cell Lymphoma and Richter Syndrome. Cancers. 2024;16(12):2170. DOI: https://doi.org/10.3390/cancers16122170

Langerbeins P, Busch R, Anheier N, Dürig J, Bergmann M, Goebeler M-E, et al. Poor efficacy and tolerability of R-CHOP in relapsed/refractory chronic lymphocytic leukemia and Richter transformation. American Journal of Hematology. 2014;89(12):E239-E43. DOI: https://doi.org/10.1002/ajh.23841

Guièze R, Eikema DJ, Koster L, Schetelig J, Sengeloev H, Passweg J, et al. Allogeneic hematopoietic stem-cell transplantation for patients with Richter transformation: a retrospective study on behalf of the Chronic Malignancies Working Party of the EBMT. Bone Marrow Transplant. 2024;59(7):950-6. DOI: https://doi.org/10.1038/s41409-024-02256-9

Puckrin R, Owen C, Fontaine A, Peters A, Stewart D, Shafey M. Allogeneic hematopoietic cell transplantation for Richter transformation of chronic lymphocytic leukemia: an intention-to-transplant analysis. Bone Marrow Transplantation. 2023;58(7):817-9. DOI: https://doi.org/10.1038/s41409-023-01978-6

Eyre TA, Schuh A, Wierda WG, Brown JR, Ghia P, Pagel JM, et al. Acalabrutinib monotherapy for treatment of chronic lymphocytic leukaemia (ACE-CL-001): analysis of the Richter transformation cohort of an open-label, single-arm, phase 1-2 study. Lancet Haematol. 2021;8(12):e912-e21. DOI: https://doi.org/10.1016/S2352-3026(21)00305-7

Appleby N, Eyre TA, Cabes M, Jackson A, Boucher R, Yates F, et al. The STELLAR trial protocol: a prospective multicentre trial for Richter’s syndrome consisting of a randomised trial investigation CHOP-R with or without acalabrutinib for newly diagnosed RS and a single-arm platform study for evaluation of novel agents in relapsed disease. BMC Cancer. 2019;19(1):471. DOI: https://doi.org/10.1186/s12885-019-5717-y

Tam C, Munoz J, Cull G, Opat S, Allewelt H, Zhang X, et al. Zanubrutinib, Alone and in Combination With Tislelizumab, for the Treatment of Richter Transformation of Chronic Lymphocytic Leukemia. Hemasphere. 2023;7(4):e870. DOI: https://doi.org/10.1097/HS9.0000000000000870

Woyach J, Stephens DM, Flinn IW, Bhat SA, Savage RE, Chai F, et al. Final results of phase 1, dose escalation study evaluating ARQ 531 in patients with relapsed or refractory B-cell lymphoid malignancies. Blood. 2019;134:4298. DOI: https://doi.org/10.1182/blood-2019-127260

Wierda WG, Shah NN, Cheah CY, Lewis D, Hoffmann MS, Coombs CC, et al. Pirtobrutinib, a highly selective, non-covalent (reversible) BTK inhibitor in patients with B-cell malignancies: analysis of the Richter transformation subgroup from the multicentre, open-label, phase 1/2 BRUIN study. Lancet Haematol. 2024;11(9):e682-e92. DOI: https://doi.org/10.1016/S2352-3026(24)00172-8

Davids MS, Rogers KA, Tyekucheva S, Wang Z, Pazienza S, Renner SK, et al. Venetoclax plus dose-adjusted R-EPOCH for Richter syndrome. Blood. 2022;139(5):686-9. DOI: https://doi.org/10.1182/blood.2021011386

Davids MS, Rogers KA, Jain N, Tyekucheva S, Ren Y, Carey C, et al. Initial results of a multicenter phase 2 study of venetoclax in combination with R-CHOP (VR-CHOP) for patients with Richter Syndrome. Hematol Oncol. 2023;41(S2):466-8. DOI: https://doi.org/10.1002/hon.3164_343

Hampel PJ, Swaminathan M, Rogers KA, Parry EM, Burger JA, Davids MS, et al. A multicenter study of venetoclax-based treatment for patients with Richter transformation of chronic lymphocytic leukemia. Blood Adv. 2024;8(10):2342-50. DOI: https://doi.org/10.1182/bloodadvances.2023012080

Armand P, Murawski N, Molin D, Zain J, Eichhorst B, Gulbas Z, et al. Pembrolizumab in relapsed or refractory Richter syndrome. Br j haematol. 2020;190(2):e117-e20. DOI: https://doi.org/10.1111/bjh.16762

Al-Sawaf O, Ligtvoet R, Robrecht S, Stumpf J, Fink A-M, Tausch E, et al. Tislelizumab plus zanubrutinib for Richter transformation: the phase 2 RT1 trial. Nat Med. 2024;30(1):240-8. DOI: https://doi.org/10.1038/s41591-023-02722-9

Tedeschi A, Frustaci AM, Condoluci A, Coscia M, Chiarle R, Zinzani PL, et al. Atezolizumab, venetoclax, and obinutuzumab combination in Richter transformation diffuse large B-cell lymphoma (MOLTO): a multicentre, single-arm, phase 2 trial. Lancet Oncol. 2024;25(10):1298-309. DOI: https://doi.org/10.1016/S1470-2045(24)00396-6

Thompson MC, Parrondo RD, Frustaci AM, Allan JN, Ghia P, Mocanu I, et al. Preliminary Efficacy and Safety of the Bruton Tyrosine Kinase Degrader BGB-16673 in Patients with Relapsed or Refractory Chronic Lymphocytic Leukemia/Small Lymphocytic Lymphoma: Results from the Phase 1 CaDAnCe-101 Study. Blood. 2024;144(Supplement 1):885-. DOI: https://doi.org/10.1182/blood-2024-199116

Spurgeon SE, Mei M, Barr PM, Barrientos JC, de Vos S, Furman RR, et al. Waveline-001: Updated Results from a Phase 1 Dose Escalation and Cohort Expansion Study of Zilovertamab Vedotin (MK-2140) in Non-Hodgkin Lymphoma. Blood. 2022;140(Supplement 1):6640-1. DOI: https://doi.org/10.1182/blood-2022-163509

Kater AP, Ye JC, Sandoval-Sus J, Bellido M, Christensen JH, Mato AR, et al. Subcutaneous Epcoritamab in Patients with Richter's Syndrome: Early Results from Phase 1b/2 Trial (EPCORE CLL-1). Blood. 2022;140(Supplement 1):850-1. DOI: https://doi.org/10.1182/blood-2022-158298

Carlo-Stella C, Hutchings M, Offner F, Mulvihill E, Relf J, Byrne B, et al. Glofitamab monotherapy induces durable complete remissions and has a manageable safety profile in patients with Richter’s transformation. Hematol Oncol. 2023;41(S2):63-5. DOI: https://doi.org/10.1002/hon.3163_28

Cheah CY, Assouline S, Baker R, Bartlett NL, El-Sharkawi D, Giri P, et al. Mosunetuzumab Monotherapy Demonstrates Activity and a Manageable Safety Profile in Patients with Relapsed or Refractory Richter's Transformation. Blood. 2023;142(Supplement 1):614-. DOI: https://doi.org/10.1182/blood-2023-173796

Winter AM, Bharadwaj S, Herrera AF, Iragavarapu C, Mirza S, Palomba ML, et al. Real-world outcomes of lisocabtagene maraleucel (liso-cel) in patients (pt) with Richter transformation (RT) from the Center for International Blood and Marrow Transplant Research (CIBMTR). J Clin Oncol. 2024;42(16_suppl):7010-. DOI: https://doi.org/10.1200/JCO.2024.42.16_suppl.7010

Kittai AS, Bond DA, William B, Saad A, Penza S, Efebera Y, et al. Clinical activity of axicabtagene ciloleucel in adult patients with Richter syndrome. Blood Advances. 2020;4(19):4648-52. DOI: https://doi.org/10.1182/bloodadvances.2020002783

Todorovic Z, Todorovic D, Markovic V, Ladjevac N, Zdravkovic N, Djurdjevic P, et al. CAR T Cell Therapy for Chronic Lymphocytic Leukemia: Successes and Shortcomings. Curr Oncol. 2022;29(5):3647-57. DOI: https://doi.org/10.3390/curroncol29050293

Kittai AS, Bond D, Huang Y, Bhat SA, Blyth E, Byrd JC, et al. Anti-CD19 Chimeric Antigen Receptor T-Cell Therapy for Richter Transformation: An International, Multicenter, Retrospective Study. J Clin Oncol. 2024;42(17):2071-9. DOI: https://doi.org/10.1200/JCO.24.00033

Nadiminti KV, Ahn KW, Patel DJ, Lian Q, Pasquini MC, Hamadani M, et al. CD19-Directed CAR-T Therapy for Richter Transformation: A CIBMTR Analysis. Transplantation and Cellular Therapy. 2025;31(2):S207-S8. DOI: https://doi.org/10.1016/j.jtct.2025.01.320

Published

2025-05-05

How to Cite

1.
Champagne J-N, Gerrie AS. Richter Transformation in the Canadian Landscape: Clinical Perspectives and Emerging Trends. Can Hematol Today [Internet]. 2025 May 5 [cited 2025 May 12];4(1):5–13. Available from: https://canadianhematologytoday.com/article/view/4-1-Champagne_et_al

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