Chemicals in soybeans may help prevent oral cancer, a new study suggests. Researchers at the University of California said their study is believed to be one of the first findings, based on human research, showing that the soybean derivative, the Bowman- Birk inhibitor, can play such a role in oral cancer prevention. They determined that it can reduce the size of pre-cancerous lesions in the mouth which can lead to oral cancer. In the study, led by Dr.Frank Meyskens, 32 participants took a daily dose of the soy derivative in lozenge form for one month. Ten of the participants showed a reduction in the size of thepre-cancerous lesions by about half. Average size of the decrease for the entire group was 24 percent. Full findings are published this month in the journalClinical Cancer Research.