Dear Flowers, I must agree with Dan Arbor. In my experience the immunophenotyping is typical of Mantle cell lymphoma. We have however experienced a B-lineage ALL with expression of CD5. This particular case had a typical common ALL phenotype with both CD19 and CD10 being positive. No other T-cell antigens were expressed. So although unusual, it is possible. Please let us know the outcome of this case. I would be very interested to hear your final decision. Happy New year to everyone, Glenda Davison Haematology Dept. Groote Schuur Hospital. Cape Town South Africa
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