Answer:
95% of breast cancer in female are of unknown causes the risk factor included
  1. positive family history
  2. extreme age
  3. mutation of BRCA1 and BRCA2 gene
  4. personal history of breast cancer
  5. radiation exposure
  6. DES exposure
First answer by Mrnaeem86. Last edit by Mrnaeem86. Contributor trust: 62 [recommend contributor recommended]. Question popularity: 0 [recommend question].