Significance of the Expression of pAKT1 and pSyk Activation Proteins in Diffuse Large B-Cell Lymphoma

Aim. To assess the prognostic value of pAKT1 and рSyk expression in DLBCL.

Materials & Methods. The study enrolled 100 patients with newly diagnosed DLBCL treated with R-CHOP first-line immunochemotherapy. The relative count of pAKT1- and pSyk-expressing tumor cells was determined by immunohistochemical and morphometric methods. The expression cut-off of these proteins was calculated by ROC analysis. The relationship of protein expression with clinical parameters of DLBCL was analyzed by Fisher’s exact two-tailed test. The 5-year overall (OS) and progression-free (PFS) survivals were estimated by Kaplan-Meier method (log-rank test).

Results. High pAKT1 expression was associated with advanced DLBCL stages, International Prognostic Index > 2, serum lactate dehydrogenase concentration above normal, failures of R-CHOP therapy, as well as worse OS and PFS. No correlation between рSyk expression and clinical lymphoma characteristics was found. The worst 5-year OS (27.6 %) was reported in cases of pAKT1 and pSyk co-overexpression (hazard ratio [HR] 5.2; 95% confidence interval [95% CI] 2.49–10.9; p < 0.001). A similar trend was observed for PFS (HR = 3.3; 95% CI 1.54–7.30; p = 0.002).

Conclusion. Overexpression of pAKT1 is an informative indicator of a poor DLBCL prognosis. Co-overexpression of pAKT1 and рSyk markers is associated with worse OS and PFS compared to their isolated expressions and other co-expression variants.

• Elena Viktorovna Vaneeva Kirov Research Institute of Hematology and Transfusiology, 72 Krasnoarmeiskaya ul., Kirov, Russian Federation, 610027 ; ФГБУН «Кировский НИИ гематологии и переливания крови ФМБА», ул. Красноармейская, д. 72, Киров, Российская Федерация, 610027
• V.A. Rosin Kirov Research Institute of Hematology and Transfusiology, 72 Krasnoarmeiskaya ul., Kirov, Russian Federation, 610027 ; ФГБУН «Кировский НИИ гематологии и переливания крови ФМБА», ул. Красноармейская, д. 72, Киров, Российская Федерация, 610027
• D.A. Dyakonov Kirov Research Institute of Hematology and Transfusiology, 72 Krasnoarmeiskaya ul., Kirov, Russian Federation, 610027 ; ФГБУН «Кировский НИИ гематологии и переливания крови ФМБА», ул. Красноармейская, д. 72, Киров, Российская Федерация, 610027
• S.V. Samarina Kirov Research Institute of Hematology and Transfusiology, 72 Krasnoarmeiskaya ul., Kirov, Russian Federation, 610027 ; ФГБУН «Кировский НИИ гематологии и переливания крови ФМБА», ул. Красноармейская, д. 72, Киров, Российская Федерация, 610027
• I.V. Paramonov Kirov Research Institute of Hematology and Transfusiology, 72 Krasnoarmeiskaya ul., Kirov, Russian Federation, 610027 ; ФГБУН «Кировский НИИ гематологии и переливания крови ФМБА», ул. Красноармейская, д. 72, Киров, Российская Федерация, 610027

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