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Graviola is the Brazilian Portuguese name (also known as soursop) for the fruit of Annona muricata, a broadleaf, flowering, evergreen 4 to 10 meter tall tree from the Amazon rain forest, also found in the Caribbean, Mexico, South America, Africa and Southeast Asia. The soursop fruit and other parts of the tree are considered to be underutilized. Information on the composition, nutritional values, medicinal uses, and toxicology of the soursop fruit and plant is limited and scattered. This 44-page booklet contains in an organized manner a fair collection of what is available and apparently reliable on the internet. The work provides a detailed description of the tree, its propagation, cultivation and the beneficial properties and uses of its fruit and leaves. The standard treatment and killing of cancer cells by way of chemotherapy is an ordeal with traumatic side effects that many patients ultimately refuse for its severity. According to Cancer Research UK, "Many sites on the internet advertise and promote graviola capsules as a cancer cure, but none of them are supported by any reputable scientific cancer organisations" and "there is no evidence to show that graviola works as a cure for cancer." On the other hand, the renowned Memorial Sloan-Kettering Cancer Center in New York City lists cancer treatment as one of the purported uses of soursop, as does the University of Connecticut - Ecology & Evolutionary Biology. Sloan-Kettering writes: “Graviola extracts from the leaf, fruit, and seed have been tested in laboratories for their anticancer effects. Some studies show these extracts to be active against breast, lung, colon, prostate, pancreas, liver, skin cancer, and leukemia cell lines. However, graviola products have not been studied in cancer patients.”