> Three shoe salespersons have been identified with rare conditions that might be associated with their chronic occupational exposure: a severe radiation burn requiring amputation in 1950,[10] a case of dermatitis with ulceration in 1957,[11] and a case of basal-cell carcinoma of the sole in 2004.[8]

There was more information in the following quite interesting article linked from the references:

https://web.archive.org/web/20100326182352/http://staff.tamh...