I received an e-mail from a doctor who happens to be part of my family by marriage. I am only posting some of the information I was able to get.
Why is this remedy being kept such a big secret? I think that the Soursop, is also known as Graviola in Brazil is a fruit that killed cancer cell by natural with 10,000 times more powerful than the chemo therapy.
In Brazil named "Graviola", in Spanish "Guanabana" ". The fruit is rather large, skin soft, white inside, and sweet; is also one that is used for smoothies and ice cream.
Soursop fruit provides a very strong effect anti-tumor / cancer, and medically proven to cure all types of cancer. In addition to cure cancer, soursop fruit also acts as anti-bacterial, anti-fungi, effective against various types of parasites / worms, lowering high blood pressure, depression, stress, and normalize the nervous system back to a less well.
Research has proven that "magic tree" and the fruit can be attacking cancer cells effective safely and naturally, without nausea, weight loss, losing hair, as happened in chemo therapy. Protect the immune system and prevent deadly infections. The patient feels stronger, more health during the treatment / healing, increased energy and improved physical appearance.
Test results from the extract (essence) of this fruit are effectively choose targets and killed bad cells from 12 different types of cancer, including colon, breast, prostate, lung, and pancreas. It’s 10,000 times stronger in slowing the growth of cancer cells compared with Adriamycin and chemo therapy. Unlike chemo therapy, this juice is selective; it only hunts and kills the bad cells and not harms / kills healthy cells.
Some parts of this tree, the bark, roots, leaves, fruit flesh and seeds, over the centuries give a cure for the Indian tribes in South America to treat heart disease, asthma, liver problems and arthritis.
Scientist from the Health Sciences Institute had a research and proved as a tree is effective cancer cells killer. 
The National Cancer Institute began the first scientific research in 1976. The results proved that the leaves and wood of Graviola could attack and destroy the cancer cells.
Since 1976, Graviola has proven to be a killer cancer cells in the extraordinary trials conducted by 20 different laboratories Independence. A study published by the Journal of Natural Products said that CatholicUniversity in South Korea, had studied and found that one of the chemical elements contained in Graviola, can select, discriminate and kill cancer cells Colon to 10,000 times more than adriamycin and Chemo Therapy while healthy cells are not touched / disturbed.
Graviola not like chemo therapy which can not distinguish between cancer cells and healthy cells, then the reproductive cells (such as stomach and hair) been killed by Chemo Therapy, causing a negative effect nausea and hair loss.
A study at Purdue University show that the Graviola leaves are able to kill cancer cells effectively, particularly cancer cells prostate, pancreas, and lung.
Limited supply of Graviola extract is in the mind and empower indigenous people harvested by Brazil, is now available in the U.S.
The full story of Graviola, which acquired, and how to use it, can be found in Beyond Chemotherapy: New Cancer Killers, Safe as Mother's milk, as a special free bonus issue of Health Sciences Institute.
Now you know the benefits of soursop fruit is extraordinary. 100% natural fruit without any side effects.
Part of the e-mail (translated into English below) read as follows:
“La fuente de esta información es fascinante: procede de uno de los fabricantes de medicinas más grandes del mundo, quien afirma que después de más de 20 pruebas de laboratorio, realizadas a partir de 1970 los extractos revelaron que:
Destruye las células malignas en 12 tipos de cáncer, incluyendo el de colon, de pecho, de próstata, de pulmón y del páncreas…
Los compuestos de este árbol demostraron actuar 10,000 veces mejor retardando el crecimiento de las células de cáncer que el producto Adriamycin, una droga quimioterapéutica, normalmente usada en el mundo.
Y lo que es todavía más asombroso: este tipo de terapia, con el extracto de Graviola, o Guanábana, destruye tan sólo las malignas células del cáncer y no afecta las células sanas. “
Instituto de Ciencias de la Salud, L.L.C. 819 N. Charles Street Baltimore, MD 1201
The source of this information is fascinating: it comes from one of the largest drug manufacturers in the world, who affirms that after more than 20 tests in the laboratory; which took place since 1970, the extracts revealed that: they destroy the malignant cells en 12 different types of cancer, including that in the colon, the chest, prostate and lung as well as in the pancreas…
The compounds that this tree has demonstrated to act 10,000 times better slowing down the growth of cancerous cells than the chemotherapy drug known by the name of Adriamycin which is used world-wide for this purpose.
But what is yet more astounding is that this kind of extract from the Graviola or Soursop destroys only the malignant cells that are cancerous and not the healthy ones.
SOURCE: http://hubpages.com/hub/Soursop-fruit-Cancer-killer