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A team of researchers from the Dr. Rath Research Institute in California has developed a cancer vaccine that is effective in reducing tumor growth. A peptide-based vaccine, it targets specific enzymes known as metalloproteinases (MMPs) that are necessary for any cancer to grow tumors, metastasize, and form blood vessels in tumors (angiogenesis). The Dr. Rath research team showed that test animals, vaccinated with peptides containing specific sequences from MMP-2 and MMP-9 and subsequently challenged with melanoma cancer cells, had an average reduction in tumor volume of about 76% compared to unvaccinated controls. Notably, some vaccinated animals did not develop any cancer at all.