Cycas revoluta but will usually flush (or grow) several new leaves by spring. This plant has gained the Royal Horticultural Society's Award of Garden Merit (confirmed 2017). The pith contains edible starch, and is used for making sago. Before use, the starch must be carefully washed to leach out toxins contained in the pith. Extracting edible starch from the sago cycad requires special care due to the poisonous nature of cycads. Cycad sago is used for many of the same purposes as palm sago. Sago is extracted from the sago cycad by cutting the pith from the stem, root and seeds of
Plant sources of anti-cancer agents podophyllotoxin which is found in "Podophyllum peltatum" (May Apple). Chemicals extracted from clippings of "Taxus brevifolia" (Pacific yew) have been used as the basis for two chemotherapy drugs, docetaxel and paclitaxel. Contains ingenol mebutate (Picato) which is used to treat skin cancer Trastuzumab emtansine (Kadcyla) is an antibody conjugated to a synthetic derivative of the cytotoxic principle of the Ethiopian plant "Maytenus ovatus". It used to treat breast cancer. Plant sources of anti-cancer agents Plant sources of anti-cancer agents are plants, the derivatives of which have been shown to be usable for the treatment or prevention of cancer in humans.