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Breast cancer is the most common cancer and is the leading cause of cancer death among women worldwide, accounting for 23% of all new cancer cases and 14% of all cancer deaths (1). Approximately 7% to 9% of all breast cancers are diagnosed in women under 40 years of age, and less than 4% are found in women under 35 (1). The median age of breast cancer patients in Asia is lower than that in Western countries, and the proportion of young breast cancer patients is much higher. Breast cancer in young women accounts for up to 4.8% of cancers diagnosed in Western countries, but more than 10% of cancers diagnosed in Asian countries (2, 3). Breast cancer in young women generally has biological features indicating a more aggressive tumor, including a more advanced tumor stage, more aggressive subtypes, and higher histological grades than in older women, and these characteristics are correlated with an increased risk of death (2-4). Breast cancer in young women is more likely to be associated with family history and gene mutations, such as BRCA mutations, than in older breast cancer patients (5). Moreover, young women with breast cancer have higher local recurrence rates after either breast-conserving surgery or mastectomy compared to older women (6). Some studies have reported that breast cancer patients under Clinicopathological and Imaging Features of Breast Cancer in Korean Women under 40 Years of Age 40     , ,