Abstract
Background: CD10, BCL6, and MUM1 are commonly used immunohistochemical stains for classifying
diffuse large B-cell lymphoma (DLBCL), which is useful in predicting outcome. Conflicting
reports of the prognostic value of other markers such as BCL2, CD23, and Ki67 proliferation
index have been reported. Our objective was to correlate these immunostains and Hans
classification with response to therapy and overall survival. Materials and Methods: A retrospective study of patients diagnosed with DLBCL from 2008–2014 at a tertiary-care
cancer hospital. The slides with the IHC stains were reviewed by two independent pathologists.
The clinical outcomes––assessed independently––were response to therapy and overall
survival. The treatment response evaluation was based on the new Lugano classification.
Statistical analyses were conducted using the Fisher’s exact test and Kaplan–Meier
survival curves. Significance was set at P < 0.05. Results: Forty-one patients were included in the study with a known Hans classification,
available clinical data, and at least 5-year follow-up. CD10 immunostain was reported
in all patients, whereas CD23 was the least reported in only four patients. No significant
association was observed between CD10, BCL6, MUM1, BCL2, and both Response to therapy
and overall survival. Owing to few cases reported CD23 immunostain, further analysis
of association is not reported. High Ki67 proliferative index of >80% was statistically
significantly associated with shorter overall survival and not statistically significant
associated with no response to therapy. Hans classification subtypes were not predictive
in regard to therapy response. Conclusion: High Ki67 expression (>80%) was associated with shorter overall survival in DLBCL.
Hans classification subtypes were not predictive.
Keywords
Activated B-cell (ABC) - BCL2 - BCL6 - B-lymphocytes - CD10 - CD23 - cell-of-origin
classification - diffuse large B-cell lymphoma (DLBCL) - germinal center B-cell (GCB)
- immunohistochemistry - Ki67 - MUM1 - overall survival - therapy response