Antitumor B (ATB), also known as Zeng Sheng Ping, is a Chinese herbal mixture composed of six plants: Sophora tonkinensis, Polygonum bistorta, Prunella vulgaris, Sonchus brachyotus, Dictamnus dasycarpus, and Dioscorea bulbifera. ATB is available as 300 mg tablets and has been traditionally used in