An excellent book on Chinese used to fight cancer is Anticancer Medicinal Herbs, by Chang Minyi. According to this book, the following single-herb formula has been used to treat prostate cancer: Lao Guan Cao [Erodium Plant]
Lao Guan Cao eliminates fever, relieves toxins, and activates the circulation of blood and vital energy Chi to the perineal region.
Usage: make a decoction, combine 10gr of Lao Guan Cao with 200ml of water. Drink eight ounces 3 times daily.