Augmentation of the in vitro mitogenic response of owl monkey peripheral blood lymphocytes by levamisole and loss of this effect with the development of herpesvirus saimiri-induced lymphoma.

Levamisole (LMS) has been shown to be capable of enhancing the proliferative response of normal owl monkey peripheral blood lymphocytes (PBL) to PHA, and, to a lesser degree, of increasing the level of spontaneous DNA synthesis. With the development of herpesvirus saimiri-induced lymphoma, these stimulatory responses were lost. LMS was not capable of stimulating tumour cells to normal functions, or of reversing the disease-induced suppressed functions on normal cells.