As noted in the General Information section, Burzynski first proposed antineoplastons as a naturally occurring biochemical defense against cancer in 1976 as a result of his study of cybernetic systems and information theory. The search for information-bearing peptides in body fluids led him to separate peptides from human blood and subsequently from human urine. He called these substances antineoplastons and categorized them according to their general and specific anticarcinogenic potential. In 1980, the developer characterized the chemical structures of antineoplastons and began preparing them synthetically rather than isolating them from human urine. Preparations now used in clinical studies to treat cancer are antineoplastons A10, AS2-5, AS2-1, A2, A3, and A5.
From 1991 to 1995, the National Cancer Institute (NCI) initiated phase II clinical trials of antineoplastons A10 and AS2-1. Protocols for two phase II clinical trials were originally developed by investigators from several cancer centers, with review and input from both the developer and NCI. The National Institutes of Health, Office of Alternative Medicine, now known as the National Center for Complementary and Alternative Medicine, provided funding for the trials. Three centers (Memorial Sloan-Kettering Cancer Center, the Mayo Clinic, and the Warren Grant Magnuson Clinical Center at NIH) began accruing participants for these NCI-sponsored studies in 1993. However, by August 1995 only nine patients had entered the trials; despite efforts by the developer, NCI staff, and investigators to reach agreement on proposed changes to increase patient accrual and dose, the studies were closed prematurely in August 1995.[1,2]
This complementary and alternative medicine (CAM) information summary provides an overview of the use of laetrile as a treatment for people with cancer. The summary includes a history of laetrile research, a review of laboratory studies, the results of clinical trials, and possible side effects of laetrile use.
This summary contains the following key information:
Laetrile is another name for the chemical amygdalin, which is found in the pits of many fruits and in numerous plants.
The developer and investigators in Japan have reported several case series showing varying results using antineoplastons as a clinical therapy against several different types of cancer, alone or in combination with standard chemotherapy.[3,4,5,6,7,8,9,10,11,12,13,14] These studies are described in more detail in the Human/Clinical Studies section of this summary. Most of these studies were phase I trials or their equivalent; therefore, the only objective of these trials was safety.
Burzynski SR: Efficacy of antineoplastons A10 and AS2-1. Mayo Clin Proc 74 (6): 641-2, 1999.
Hammer MR, Jonas WB: Managing social conflict in complementary and alternative medicine research: the case of antineoplastons. Integr Cancer Ther 3 (1): 59-65, 2004.
Burzynski SR, Stolzmann Z, Szopa B, et al.: Antineoplaston A in cancer therapy. (I). Physiol Chem Phys 9 (6): 485-500, 1977.
Tsuda H, Hara H, Eriguchi N, et al.: Toxicological study on antineoplastons A-10 and AS2-1 in cancer patients. Kurume Med J 42 (4): 241-9, 1995.
Burzynski SR: Toxicology studies on antineoplaston AS2-5 injections in cancer patients. Drugs Exp Clin Res 12 (Suppl 1): 17-24, 1986.
Burzynski SR, Burzynski B, Mohabbat MO: Toxicology studies on antineoplaston AS2-1 injections in cancer patients. Drugs Exp Clin Res 12 (Suppl 1): 25-35, 1986.
Burzynski SR, Kubove E: Toxicology studies on antineoplaston A10 injections in cancer patients. Drugs Exp Clin Res 12 (Suppl 1): 47-55, 1986.
Burzynski SR, Kubove E, Burzynski B: Treatment of hormonally refractory cancer of the prostate with antineoplaston AS2-1. Drugs Exp Clin Res 16 (7): 361-9, 1990.
Burzynski SR, Kubove E, Burzynski B: Phase I clinical studies of antineoplaston A5 injections. Drugs Exp Clin Res 13 (Suppl 1): 37-43, 1987.
Burzynski SR, Kubove E: Phase I clinical studies of antineoplaston A3 injections. Drugs Exp Clin Res 13 (Suppl 1): 17-29, 1987.
Burzynski SR, Kubove E: Initial clinical study with antineoplaston A2 injections in cancer patients with five years' follow-up. Drugs Exp Clin Res 13 (Suppl 1): 1-11, 1987.
Sugita Y, Tsuda H, Maruiwa H, et al.: The effect of Antineoplaston, a new antitumor agent on malignant brain tumors. Kurume Med J 42 (3): 133-40, 1995.
Tsuda H, Sata M, Kumabe T, et al.: Quick response of advanced cancer to chemoradiation therapy with antineoplastons. Oncol Rep 5 (3): 597-600, 1998 May-Jun.
Kumabe T, Tsuda H, Uchida M, et al.: Antineoplaston treatment for advanced hepatocellular carcinoma. Oncol Rep 5 (6): 1363-7, 1998 Nov-Dec.
Burzynski SR: Potential of antineoplastons in diseases of old age. Drugs Aging 7 (3): 157-67, 1995.
In this article
This information is produced and provided by the National
Institute (NCI). The information in this topic may have changed since it was written. For the most current information, contact the National
Institute via the Internet web site at http://
.gov or call 1-800-4-CANCER.
WebMD Public Information from the National Cancer Institute
September 04, 2014
This information is not intended to replace the advice of a doctor.
Healthwise disclaims any liability for the decisions you make based on this