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近年来，女性乳腺癌发病率在我国沿海经济发达地区呈明显上升趋势。90年代初期与70年代初期相比，上海市区女性乳腺癌标化发病率上升了48．7％，平均每年增加2．7％[1]；同时，南京市区女性乳腺癌发病率也上升至女性恶性肿瘤的第二位。因此研究这些地区女性乳腺癌发病的危险因
In recent years, the incidence of female breast cancer has shown a clear upward trend in China’s coastal economically developed regions. Compared with the early 1970s, the incidence of breast cancer in Shanghai has increased by 48.7% in the early 1990s and increased by 2.7% annually[1]. At the same time, the incidence of breast cancer among women in Nanjing has increased. To the second place in female malignancy. Therefore, study the risk of female breast cancer in these areas.