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We’re told cancer is prevalent in tissues that regularly regrow, such as intestinal and skin cells. I recently read about Darek Fidyka, the paralysed man who received pioneering surgery to restore the use of his legs by implanting olfactory cells from his nose (which regularly divide) into his spinal cord. It made me wonder: why is nose cancer not a common occurrence, because these tissues constantly regrow?

Stuart Watts, Glasgow, UK

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This article appeared in print under the headline “Who nose?”