Figure 1. Combination of curcumin with HHT synergistically inhibited lymphoma cell proliferation. (A) U937 or (B) Raji cells were treated with 0, 5, 10, 20, 40, or 80 μM curcumin for 72 h. CCK-8 assay was used to measure cell viability. (C) U937 or (D) Raji cells were treated with 0, 5, 10, 20, 40, 80, or 160 ng/mL HHT for 72 h. CCK-8 assay was used to measure cell viability. (E) U937 or (F) Raji cells were treated with 5 ng/mL HHT plus curcumin (0, 5, 10, 20, or 40 μM) for 72 h. CCK-8 assay was used to measure cell viability. *P < 0.05, **P < 0.01 compared to control group.