AKT1 and Kaposi's sarcoma: In contrast to the results reported in the study by Khakoo et al, who found that human MSCs inhibited the proliferation of Kaposi’s sarcoma cells by inhibiting the in vitro activation of the Akt protein kinase (6), we did not find that the inhibitory effects of MSCs were affected by the addition of an Akt inhibitor, indicating that the effects of MSCs on lymphoma cells are not medaited through the Akt pathway.