Prognostic Significance of Cereblon Expression in Patients With Multiple Myeloma.

BACKGROUND: To personalize the treatment approach for patients with multiple myeloma (MM), molecular markers such as cereblon (CRBN) are currently the focus of investigation. The aim of the present study was to test the prognostic significance of CRBN expression in MM patients ineligible for autologous stem cell transplantation (ASCT). PATIENTS AND METHODS: The data from 92 previously untreated patients were analyzed. The distribution according to the International Staging System score was 26.1%, 30.4%, and 43.5% with a score of 1, 2, and 3, respectively. Thalidomide- and bortezomib-based combinations were used in 83.7% and 16.3% of the patients, respectively. RESULTS: A treatment response (complete remission, very good partial remission, partial remission) was achieved in 83.7% of the patients and correlated with high CRBN expression (P = .006), mainly in the patients treated with thalidomide (P = .028). Low CRBN expression affected progression-free survival (PFS; P = .017) but not overall survival (OS) in patients treated with thalidomide and had no influence on OS in the bortezomib group. In the Cox regression model, low CRBN expression was the most important prognostic parameter that influenced PFS in the thalidomide-treated patients (P = .012). CONCLUSION: CRBN expression is of prognostic value in MM patients ineligible for ASCT treated with thalidomide as an immunomodulatory drug. With low expression indicating a possible suboptimal treatment outcome, measurement of CRBN expression might serve as additional prognostic tool in the personalized treatment approach.

Dipeptidyl peptidase IV: serum activity and expression on lymphocytes in different hematological malignancies.

The aim of this research was to determine the serum dipeptidyl peptidase IV (DPPIV) activity as well as the percentages of CD26 + lymphocytes and CD26 + overall white blood cells in patients with hematological malignancies: non-Hodgkin lymphoma (NHL), Hodgkin lymphoma (HL), leukemia, plasmacytoma and multiple myeloma, and in healthy individuals. Data from our study showed significantly decreased serum DPPIV activity and a significant decrease in the percentage of: CD26 + lymphocytes, CD26 + overall white blood cells and lymphocytes in patients with NHL in comparison to healthy controls. Patients with leukemia had a statistically significant lower activity of DPPIV in serum and significant decrease in the percentage of CD26 + lymphocytes in relation to healthy controls. Furthermore, significantly decreased DPPIV serum activity associated with a significantly reduced percentage of CD26 + overall white blood cells and percentage of lymphocytes was found in patients with multiple myeloma when compared to the healthy control group. The obtained results indicate that immune disturbances that can occur in hematological malignancies might be related to the decreased expression and activity of CD26/DPPIV that we observed.