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Related Experiment Video

Updated: Feb 4, 2026

A Protocol for Rapid Post-mortem Cell Culture of Diffuse Intrinsic Pontine Glioma DIPG
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Clonal Complexity Defines Distinct Tumor-Intrinsic Biology and Prognosis in Diffuse Large B-Cell Lymphoma.

Takahiro Haeno1,2, Kazuko Sakai1,3, Shuji Minamoto1,2

  • 1Kindai University Faculty of Medicine, Department of Genome Biology, Osaka, Japan.

Cancer Medicine
|February 2, 2026
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Summary

Intratumor heterogeneity (ITH) in diffuse large B-cell lymphoma (DLBCL) is linked to poorer outcomes, particularly in the activated B-cell (ABC) subtype. Clonal complexity in DLBCL tumors reveals distinct biological features and mutations, impacting disease pathogenesis.

Keywords:
DNA mutational analysiscopy number variationsdiffuse large B‐cell lymphomagene expression profilesgenetic heterogeneity

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Area of Science:

  • Hematology
  • Oncology
  • Genetics

Background:

  • Intratumor heterogeneity (ITH), the presence of distinct cancer cell subclones, is linked to poor prognosis in many cancers.
  • The clinical and biological significance of ITH in diffuse large B-cell lymphoma (DLBCL) remains unclear.

Purpose of the Study:

  • To investigate the impact of clonal complexity on clinical outcomes and biological features in DLBCL.
  • To assess the relationship between clonal composition and patient survival in DLBCL subtypes.

Main Methods:

  • A SNP-array-based approach was used to determine clonal composition (CC) in 74 newly diagnosed advanced-stage DLBCL patients.
  • Clonal complexity was quantified by the CC number, and survival analysis was performed.

Main Results:

  • Patients with Poly-CC tumors (≥1 subclone) had significantly worse 5-year event-free survival (38.9%) compared to Mono-CC tumors (0 subclones, 69.1%) (p=0.0520).
  • This association was significant in the activated B-cell (ABC) subtype (p=0.0450) but not the germinal center B-cell (GCB) subtype (p=0.910).
  • Poly-CC tumors showed increased cell cycle pathway activity, higher Ki-67 rates, more differentiated transcriptional states, and a higher mutation burden, especially in the ABC subtype.

Conclusions:

  • Clonal complexity is a significant factor in DLBCL, particularly within the ABC subtype.
  • Tumor-intrinsic features and biological diversity, including mutations and pathway activation, are captured by clonal complexity.
  • These findings provide new insights into DLBCL pathogenesis and the role of heterogeneity.