Source:  http://www.aloe.com/why.html


1989 
     Researchers from Okinawa, Japan reported in the Japanese Journal of
Cancer Research, that Aloe contained at least three anti-tumor agents, 
emodin, mannose, and lectin. The researchers concluded that Aloe controls
pulmonary carcinogenesis and is effective in the treatment of leukemia and 
sarcoma and that it would prevent the development of tumors.

1991
     Ian R. Tizard, PhD, of Texas A&M, reported in the Journal of Molecular 
BBiotherapy, that Aloe mannose was highly effective against feline leukemia 
and soft tissue cancer in cats and dogs.
 
1992
     Dr. James Duke, United States Department of Agriculture, approved the 
use of Aloe mannose as a treatment of soft tissue cancer in animals and 
feline leukemia. 


Source:  http://infinity.dorsai.org/Naturopathic.Physician/articles.lay
                cancer.botanicals.JS.html

LILIACEAE FAMILY

     Aloe has been shown to be prophylactic, and possibly therapeutic to 
cobalt 60 induced leukopenia.  Aloe may also have an anti-sarcoma effect.
2, 3, 4  
A long chained mannan polymer known as Acemannan has been found to 
have immunostimulatory properties and is used parenterally in veterinary 
medicine for feline leukemia and fibrosarcoma. 45,46 
It is thought that Acemannan stimulates macrophages to release Tumor 
Necrosis Factor, interleukin and interferon. The consumption of 1/2 to 1 
liter of aloe vera juice appears to be the necessary therapeutic dosage for 
humans.
46. Sheets MA, et al, Studies of the effects of acemannan on retrovirus 
infections: Clinical stabilization of feline leukemia virus-infected cats. 
Mol Biother 3(1):41-5, 1991