Testiuclar cancer is rare, accounting for only 1% of all incident cancers and <1% of all cancer deaths in males.[9] However, among men aged 15 to 44 years, these tumours are the most common cancer diagnosed.[10] The median age at diagnosis is 33 years.[9] Incidence rates vary worldwide, with highest incidence rates in Northern European countries, and lowest incidence rates in Asian and African countries.[10] In one European study, the average annual testicular cancer rate was 7.32 per 100,000 men.[11] In the UK there are around 1400 new cases each year, with the highest incidence in those aged 25 to 35 years.[12] In the US, it is estimated that there will be 9610 new cases of testis cancer and an estimated 440 men will die of this disease in 2020.[13] The trend over the past 40 years has been towards an age-dependent increase in the incidence of this disease in the US.[9] The increasing incidence rate of testicular cancer supports the existence of environmental factors and appears to be related to birth cohort (i.e., the year in which born).[14][15] White men have, by far, the highest incidence compared with African and Asian men. In the US, the incidence in white men is four times that in black men.[16]

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