From the Journals

British good practice paper offers MCL diagnosis pearls



Immunohistochemical panels used in the diagnosis of mantle cell lymphoma should include cyclin D1 and SOX11 immunostaining, according to a good practice paper from the British Society of Haematology.

Pamela McKay, MD, of the Beatson West of Scotland Cancer Centre, Glasgow, and her colleagues provided updated recommendations on diagnosis and staging of mantle cell lymphoma (MCL) based on a review of literature from 1980 to 2017. The good practice paper aims to offer best practice advice based on consensus where the evidence is limited. Specifically, the paper incorporates new information on molecular pathology and the use of positron emission tomography/computed tomography (PET/CT) scanning in staging of disease.

Mantle cell lymphoma histology Wikimedia Commons/TexasPathologistMSW/CC-ASA 4.0 International

Mantle cell lymphoma

The top recommendations related to MCL diagnosis include performing lymph node excision or adequate core biopsy for diagnosis of nodal MCL. For non-nodal presentation, a tissue biopsy or peripheral blood can be used. Additionally, immunohistochemical panels should include cyclin D1 and SOX11 immunostaining.

In cases of atypical morphology, aberrant immunophenotype, equivocal cyclin D1 positivity, or unusual clinical presentation, the authors recommended fluorescence in situ hybridization (FISH) to demonstrate the presence of the t(11;14) translocation. They also recommended recording the Ki67 Proliferation Index at baseline, with an index of greater than 30% being indicative of a poorer outcome.

In terms of staging disease, Dr. McKay and her associates recommended that patients undergo staging with CT of the neck, chest, abdomen, and pelvis. They recommended against routine use of fluorodeoxyglucose PET for MCL staging, but said it could be considered if radical radiotherapy is being proposed for early-stage disease.

For cases with suspicion of central nervous system involvement, lumbar puncture with cytospin and immunophenotyping is recommended.

They recommended that all MCL patients have either their simplified or combined MCL international prognostic index score recorded at baseline.

All the authors made a declaration of interest to the British Society of Haematology and task force chairs, which may be viewed on request.

SOURCE: McKay P et al. Br J Haematol. 2018 Jun 8. doi: 10.1111/bjh.15281.

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