乳腺癌是女性最常见的恶性肿瘤之一。据西方国家统计,每8~9位妇女就有1人患乳腺癌,且其病死率高,是妇女死亡的首要原因。乳腺癌在我国占女性各种恶性肿瘤的7%~10%,仅次于子宫颈癌,并呈逐年上升趋势,有学者报道乳腺癌占女性肿瘤之首位[1]。近年来,美国乳腺癌的病死率已开始以每? Breast cancer is one of the most common malignancies in women. According to Western statistics, 1 out of every 8 to 9 women has breast cancer, and its high mortality rate is the leading cause of death among women. Breast cancer in our country accounted for 7% to 10% of all kinds of malignant tumors in women, second only to cervical cancer, and showed an upward trend year by year, some scholars have reported that breast cancer accounted for the first place of female tumors [1]. In recent years, the US case fatality rate has begun to breast cancer every?