An-Najah News - Pregnancy at a younger age (25 years and younger), can reduce the risk of breast cancer by 30%, a new study claims. Scientists say women breast cells protect themselves from cancer after pregnancy in mice by tucking away a potent cancer gene cMYC where it cannot cause harm. Another trick is keeping breast cells suspended in a state of pre-senescence, a stage of cell's life cycle between dying, living, and potential cancer.