11/07/2026
Tailored Approaches & Treatment Paradigms in Mantle Cell Lymphoma
Ong Shin Yeu, SGH
Mantle cell lymphoma (MCL) management is undergoing a significant transformation, with advances in molecular profiling, measurable residual disease (MRD) assessment, and targeted therapies reshaping traditional treatment approaches. In this excellent lecture, delivered by Dr Ong Shin Yeu from Singapore General Hospital and chaired by Prof Goh Yeow Tee, the latest evidence was reviewed to illustrate how frontline management is being reshaped by covalent BTK inhibitors while highlighting the persistent challenges posed by biologically high-risk disease.
Risk assessment remains central to treatment selection. TP53 mutation, high p53 expression, blastoid or pleomorphic morphology, elevated Ki67 and complex karyotype consistently identify patients with poorer outcomes. Recent data also reinforce the limitations of p53 immunohistochemistry alone, with TP53 sequencing providing more reliable prognostic information. At the same time, MRD is emerging as an important tool to individualise therapy, with the EA4151 study demonstrating that patients achieving MRD-negative complete remission after induction derived no additional benefit from routine autologous transplantation, while MRD-positive patients converting after transplant experienced outstanding three-year progression-free and overall survival.
Perhaps the most practice-changing data come from the incorporation of BTK inhibitors into first-line treatment. The phase III TRIANGLE study demonstrated that adding ibrutinib to intensive frontline therapy improved failure-free survival from 70% to 82% at 55 months, alongside an approximate 10% improvement in four-year overall survival. Importantly, transplant did not confer additional benefit when combined with BTK inhibitor-based therapy, supporting a progressively diminishing role for routine autologous transplantation. Rituximab maintenance remained beneficial even after two years of BTK inhibitor therapy, reinforcing the value of maintenance strategies alongside targeted treatment.
For older or less fit patients, the phase III ECHO trial established acalabrutinib plus bendamustine-rituximab as an effective frontline option, extending median progression-free survival from approximately 50 to 66 months, increasing complete remission rates by around 13%, and reducing the risk of progression or death by up to 36% after prespecified COVID-adjusted analyses. Benefit was consistently observed across several high-risk biological subgroups, including TP53-mutated, blastoid and highly proliferative disease, while maintaining an acceptable safety profile with relatively low rates of off-target toxicities compared with first-generation BTK inhibition.
The lecture also explored how treatment paradigms continue to evolve beyond conventional chemoimmunotherapy. The ENRICH study suggested that chemo-free ibrutinib-rituximab can outperform immunochemotherapy overall, although the benefit was largely driven by inferior R-CHOP outcomes rather than superiority over bendamustine-rituximab. Real-world analyses further raised the question of whether sequential therapy may remain appropriate for selected standard-risk patients, whereas upfront triplet strategies and BTK inhibitor-based combinations appear most justified for biologically high-risk disease. In the relapsed setting, outcomes after covalent BTK inhibitor failure remain poor, with median progression-free survival for many currently available agents measured in months. By contrast, CAR T-cell therapy continues to deliver the most durable disease control in this setting, underscoring the importance of early referral and treatment planning before clinical deterioration.
Overall, the lecture highlighted a clear shift towards biologically informed, risk-adapted management of MCL. Frontline BTK inhibitor-based therapy is increasingly becoming the standard of care, MRD is poised to guide decisions regarding transplant, and the role of routine autologous transplantation continues to diminish. As molecular profiling, MRD assessment and cellular therapies become more widely integrated into practice, treatment decisions are likely to become increasingly personalised, with the greatest opportunity to influence long-term outcomes lying in selecting the optimal first-line strategy.
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