- Design
- Retrospective diagnostic study with dual kappa/lambda mRNA ISH
- Population
- 53 lymph node biopsies across the NLPHL to cHL spectrum
- Primary outcome
- Light-chain mRNA pattern in neoplastic cells
- Effect
- Canonical pattern in 13/13 NLPHL and 12/15 overlap cases; cHL negative or non-canonical only
Nodular lymphocyte-predominant Hodgkin lymphoma keeps its B-cell programme; classic Hodgkin lymphoma loses it. Cases with overlapping morphology and immunophenotype, particularly against lymphocyte-rich cHL, remain hard to classify.
This study applied a sensitive dual kappa/lambda mRNA ISH assay to 53 lymph node biopsies: 13 typical NLPHL, 15 overlap cases, 11 lymphocyte-rich cHL and 14 other cHL. Strong, diffuse cytoplasmic light-chain signal in tumour cells — the canonical pattern — was seen in all typical NLPHL and 80% (12 of 15) of overlap cases. Classic Hodgkin lymphoma was either negative or showed only faint perinuclear or granular signal, in 55% of lymphocyte-rich and 28% of other subtypes.
Canonical staining therefore supports NLPHL with aberrant features, which matters because NLPHL and cHL are treated differently. The study is small and the assay is not yet widely available.
- Consider kappa/lambda mRNA ISH when NLPHL and lymphocyte-rich cHL cannot be separated
- Strong diffuse cytoplasmic signal in tumour cells favours NLPHL
- Faint perinuclear or granular signal does not indicate NLPHL; it occurred in cHL
- Interpret alongside architecture, immunophenotype and EBV status, not in isolation
Why it matters
It offers an objective test in a grey zone where the diagnosis changes treatment.
Don't overread it
53 cases from expert centres; the assay needs validation before routine use.
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