Synergistic effect of BCL-2 inhibitor and myddosome assembly inhibitor on ABC DLBCL cells. (A, B) OCI-LY10 cells were treated for 72 h with ABT-199, ST2825 or both, at the indicated doses, followed by a WST-1 assay. Inhibition at varying dosimetries for the inhibitor of BCL-2 (ABT-199) and MYD88 (ST2825) in OCI-LY10 cells is depicted with (A) heat maps and (B) line graphs. (C) Synergism was evaluated via CI analysis, and the CI values of OCI-LY10 cells at varying dosimetry values for ABT-199 and ST2825 are demonstrated via heat maps. (D) Apoptotic cell population (annexin V-positive) of OCI-LY10 cells analyzed by flow cytometry, following treatment for 48 h with the vehicle, ST2825 (10 µM), ABT-199 (1 µM) or combination treatment. Statistical analysis by one-way ANOVA with Tukey's post hoc test. Data are presented as the mean ± standard deviation *P<0.05. BCL-2, B-cell lymphoma-2; ABC, activated B cell; DLBCA, diffuse large B-cell lymphoma; MYD88, myeloid differentiation primary response gene 88; CI, combination index.