A 37-year-old woman with breast cancer had a family history of breast and ovarian cancer. Molecular genetic testing revealed a BRCA1 mutation.
What is the normal function of BRCA1?
A: angiogenesis
B: apoptosis
C: cell adhesion
D: promotion of mitosis
E: tumour suppression
Correct answer: E Explanation BRCA1 is a tumour suppressor gene, involved in DNA repair.