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An apple a day keeps the doctor away, and perhaps a serving of broccoli or watercress can help keep cancer at bay. A compound and an enzyme that occur naturally in cruciferous vegetables–cauliflower, cabbage, broccoli and Brussels sprouts–may help prevent recurrence and spread of some cancers, according to researchers. When they treated human cervical cancer stem cells with phenethyl isothiocyanate (PEITC) in a Petri dish, about 75 percent died within 24 hours using a 20-micromolar concentration of the compound.