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Breast cancer is the most common cancer among women in the Western world. Its incidence has gradually been rising and, since the introduction of screening mammography in the 1980s, its growth has even accelerated. Moreover, in some regions of Asia, a surge in incidence has also occurred and has been attributed, at least in part, to a "Westernization" of lifestyle. Recently, it has been observed in several countries that the mortality associated with breast cancer is dropping. This may be due to changes in the biology of tumors (e.g., a greater proportion of estrogen-receptorpositive tumors), earlier presentation as a result
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