However, proof had been lacking for IGF-1 until now. So the saliva argument has been invalidated by scientific experiment. Now there are at least three relevant studies. Some humans suffer from a condition called acromegaly, or gigantism, which is characterized by excessive growth of the head, face, hands, and feet. This is an important finding.
Cancer is uncontrolled cell division.
A study published in June by Renato Baserga and others in Cancer Research reveals that IGF-1 promotes the growth of cancer tumors in laboratory animals and in humans by preventing programmed cell death. This is another important finding. The relationship of IGF-1 to cancer deserves special attention. Council on Scientific Affairs, American Medical Association. Biotechnology and the American Agricultural Industry.