OST-01 is a plant-derived product with medicinal properties. As such, its composition includes several structurally complex molecules that may be recognized, isolated and recombined at different ratios to achieve an optimal therapeutic index with possible maximal level of activity and lower level of toxicity. Herein we present the preliminary results of the pharmacological activity and efficacy of OST-01 tested in vitro and in vivo in leukemia and cancer models.