Michael - from the National Institutes of Health:

Because of the small number of patients in trials, no definitive conclusions can be drawn about the effectiveness of treatment with antineoplastons.

Information about these trials is available on the NCI’s Cancer.gov Web site at http://www.cancer.gov/clinical_trials on the Internet.

And from the American Cancer Society:

Thousands of patients have been treated with antineoplastons, mostly at the same clinic, and clinical trials are underway there for many types of cancer. Published clinical trial results are available for a relatively small number of patients and the effectiveness of antineoplastons as a cancer therapy remains uncertain. Most cancer specialists believe there is not enough evidence to recommend use of antineoplastons, except perhaps in the context of clinical trials that will provide reliable information on the safety and effectiveness of this treatment.