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Eble JN, Sauter G., Epstein JI, Sesterhenn IA - iarc

Eble JN, Sauter G., Epstein JI, Sesterhenn IA - iarc

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Infiltrating urothelial carcinoma<br />

A. Lopez-Beltran<br />

G. <strong>Sauter</strong><br />

T. Gasser<br />

A. Hartmann<br />

B.J. Schmitz-Dräger<br />

B. Helpap<br />

A.G. Ayala<br />

P. Tamboli<br />

M.A. Knowles<br />

D. Sidransky<br />

C. Cordon-Cardo<br />

P.A. Jones<br />

P. Cairns<br />

R. Simon<br />

M.B. Amin<br />

J.E. Tyczynski<br />

Definition<br />

Infiltrating urothelial carcinoma is defined<br />

as a urothelial tumour that invades<br />

beyond the basement membrane.<br />

ICD-O code 8120/3<br />

Synonym<br />

Transitional cell carcinoma.<br />

Epidemiology of urothelial<br />

bladder cancer<br />

Bladder cancer is the 7th most common<br />

cancer worldwide, with an estimated<br />

260,000 new cases occurring each year<br />

in men and 76,000 in women {749}.<br />

Cancer of the urinary bladder accounts<br />

for about 3.2% of all cancers worldwide<br />

and is considerably more common in<br />

males than in females (ratio worldwide is<br />

about 3.5:1) {2014}. In both sexes, the<br />

highest incidence rates of bladder cancer<br />

are observed in Western Europe,<br />

North America and Australia {2016}.<br />

The highest incidence rates of bladder<br />

cancer in males in 1990s were observed<br />

in the following registries: Limburg<br />

(Belgium) – 42.5/105, Genoa Province<br />

(Italy) – 41.1/105, and Mallorca (Spain) –<br />

39.5/105 {2016}. The highest rates in<br />

females were noted in Harare<br />

(Zimbabwe) – 8.3/105, Scotland (UK) –<br />

8.1/105, North Western England (UK) –<br />

8.0/105, and white population of<br />

Connecticut (USA) – 8.0/105. The highest<br />

prevalence of bladder cancers in<br />

both males and females is observed in<br />

North America and in countries of the<br />

European Union {2084}. In general, the<br />

prevalence of bladder tumours in developed<br />

countries in approximately 6-times<br />

higher compared with that in developing<br />

countires.<br />

The most common type of bladder cancer<br />

in developed countries is urothelial<br />

carcinoma, derived from the uroepithelium,<br />

which constitutes more than 90% of<br />

bladder cancer cases in USA, France or<br />

Italy. However, in other regions (e.g.<br />

Eastern and Northern Europe, Africa,<br />

Asia) the relative frequency of urothelial<br />

carcinoma of the bladder is lower. In general,<br />

among all registries included into<br />

the 8th volume of "Cancer Incidence in<br />

Five Continents" {2016} urothelial carcinoma<br />

constitutes 84% of bladder cancer<br />

in males and 79% in females. Other<br />

types of bladder cancer, i.e. squamous<br />

cell carcinoma and adenocarcinoma<br />

have much lower relative frequency. In all<br />

"Cancer Incidence in Five Continents"<br />

{2016} registries squamous cell carcinoma<br />

accounts for 1.1% and 2.8% of all<br />

bladder cancers in men and women<br />

respectively. Adenocarcinoma of the<br />

bladder constitutes respectively 1.5%<br />

and 1.9% of all bladder tumours worldwide<br />

{2016}. It is estimated that approximately<br />

70-80% of patients with newly<br />

diagnosed bladder cancer present with<br />

non-invasive or early invasive (i.e. stage<br />

Ta, Tis, or T1).<br />

Etiology of urothelial bladder<br />

cancer<br />

Risk factors<br />

There are several known and potential<br />

risk factors of bladder cancer. Cigarette<br />

smoking and occupational exposure to<br />

aromatic amines are the most important<br />

among them {1877}.<br />

Tobacco smoking<br />

Tobacco smoking is the major established<br />

risk factor of bladder cancer. It is<br />

estimated that the risk of bladder cancer<br />

attributed to tobacco smoking is 66% for<br />

men and 30% for women {1158}.<br />

The risk of bladder cancer in smokers is<br />

2-6 fold that of non-smokers {313,391,<br />

1877}. The risk increases with increasing<br />

duration of smoking, and for those with<br />

the longest history of smoking (60 years<br />

or more) reaches approximately 6 in men<br />

and 5 in women {313}. The excess of risk<br />

is observed also with increasing intensity<br />

of smoking (number of cigarettes per<br />

day), reaching maximum of about 3 for<br />

those smoking 40 or more cigarettes per<br />

day {313}. The increase of risk with the<br />

increasing duration and intensity of<br />

smoking is similar in both sexes {1158}<br />

but, some studies indicate higher risk in<br />

women than in men at the equivalent<br />

level of exposure {391}.<br />

Fig. 2.01 Estimates of the age-standardized incidence rates of bladder cancer in males, adjusted to the<br />

world standard age distribution (ASR). From Globocan 2000 {749}.<br />

Infiltrating urothelial carcinoma<br />

93

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