Testicular cancer in England and Wales: some epidemiological aspects.

Testicular-cancer incidence and mortality rates have been rising among young men in England and Wales since the beginning of the century, and this is now the most common neoplasm registered among men aged 25--34. Death rates are highest among professional, administrative, and clerical workers and lowest among manual workers; differential social-class rates were already apparent in 1921. Little is known about the aetiology of the disease.