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Excised specimen of a cancerous human bladder, showing a large tumour mass. Occupational factors such as the exposure to certain carcinogenic chemicals (benzidine, alpha- and beta- naphthylamine) are believed to increase the risk of contracting bladder cancer. The high incidence of the disease in chemical industry workers has been noted for many decades. More recently, workers in the rubber and cable-making industries, certain laboratory technicians and engineering workers using lubricating oils have been regarded as being at a greater risk of developing bladder cancer than the general population.
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