Risk factors are a little different for different age groups. Whereas, in the older age group, the most important risk factor is a positive family history, in the younger age group the recent oral contraceptive use is also a risk factor for early-onset breast cancer, especially for estrogen receptor tumors. Younger women who have had an early pregnancy or multiparity are also at an elevated risk for several months immediately following the delivery. In addition, younger women who have had a prior mantle irradiation for Hodgkin lymphoma, who had an early onset of menstruation, and who are heavy on consumption of alcohol and red meat are also at an elevated risk of breast cancer.
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Researchers have found that intense physical activity can help reduce the risk of breast cancer in premenopausal women by as much as 23%. While there have been studies that have failed to establish a link between the two, into a systematic review of 76 studies found that 53% of studies confirmed a significant protective effect, 37% reported a non-significant risk reduction, and only 10% failed to show a correlation. With regards to diet, some studies have shown that women who consume a diet high in animal fat have nearly 50% greater risk of premenopausal breast cancer, than women with a diet rich in vegetable fat. Also, Mediterranean diet rich in extra virgin oil has also been found helpful in reducing risks of breast cancer
Across all groups, 5-year relative survival rates have been found to be lower for women under 40 than for older women, with lowest being for those aged 25-29 years (72%), followed by those aged 20-24 and 30-34 (75% and 76%, respectively), and those aged 35-39 (80%). In contrast, survival rates for women aged 45-80 were between 84% to 86%.
If you are a young woman with a family history of breast cancer, or you know that you have a BRCA1 or BRCA2 mutation (or to a lesser extent, a TP53 mutation), you may be at a risk of premenopausal breast cancer.