BLBC is more common among young and premenopausal women in Africa and African Americans. It is generally believed that BLBC occurs mostly among young people, however the latest large sample studies based on immunohistochemistry showed that the average age of BLBC patients is 47.7 to 55 years old. Incidence of BLBC and breastfeeding were negative related. Compared with ductal breast cancer, BLBC is more common among women who have earlier menarche age; whose first-term gestational age is less than 26 years old. Women who have low economic and social status, metabolic syndrome and use contraceptives for more than one year are more likely to develop BLBC. Increased waist-hip ratio before menopause has significant correlation with BLBC.
Basal-like carcinoma
Lymphoepithelioma-like carcinoma
Basal-cell carcinoma
Adenosquamous carcinoma
Verrucous carcinoma
Anaplastic carcinoma
Epithelioma
Spindle cell carcinoma