Methods and compositions for prevention and therapy of cancer are provided. Compositions comprising therapeutically effective amounts of two or more of an extract of Ganoderma lucidum, an extract of Saliva multiorrhiza and an extract of Scutellaria barbata and optionally a therapeutically effective amount of an extract of Hippophae rhamnoides are provided. Novel synergistic effects of the use of these compounds in combination therapy are disclosed. Embodiments further comprising therapeutically effective amounts of at least one chemotherapeutic agent are also provided.