If your financial situation requires a more conservative stance, there is nothing wrong with trailing certain benchmarks if your level of risk is reduced accordingly.
For certain women who are at increased risk of breast cancer, there are medications that are approved for breast cancer prevention and these should be discussed with a physician.
As yet, there is no explanation for these cases but potential risk factors could be poor diet, the spread of certain strains of the human papillomavirus (HPV) and even a possible lack of sunshine.