Agrochemicals firm Syngenta has denied that employees of a Swiss factory it took over in the late 1990s suffer from cancer induced by an insecticide...The director of the Syngenta factory in Monthey says the company has been on the case since it took over from Ciba, and has pursued a health-screening programme for employees. [also refers to Ciba-Geigy (now Ciba Speciality Chemicals)]