Early development of breast cancer in Mexican women It has long been known that Japanese women present with breast cancer at an earlier age than US and European women; about 50% of Japanese women with breast cancer are less than 50 years old. Now, its has been shown that Mexican women also present early - roughly a decade before those in the US and Europe. A team of researchers from Mexico analysed 29,075 cases of breast cancer, taken from the database of the Histopathologic Registry of Malignant Neoplasms in Mexico City, Mexico, registered between 1993 and 1996. Data distribution was compared with other countries world-wide. The median age at presentation in the Mexican women was 51 years (range 20-99) and 45.5% of all cases presented before the age of 50. The most frequently affected age group were aged 40-49 years (29.5%), and the percentage of women in the 30-39 years group was similar to that in the 60-69 years age group (circa 14%). This was in sharp contrast to women from the US, where the median age at presentation is 63 years, and with women from Western Europe, where only a quarter are younger than 50. Interestingly, the age at presentation in Mexican women was similar to that in Dutch women with familial breast carcinoma. 06/08/2001; Lancet Oncology Remember we are NOT Doctors and have NO medical training. This site is like an Encylopedia - there are many pages, many links on many topics. Support our work with any size DONATION - see left side of any page - for how to donate. You can help raise awareness of CAM.