Sandra
Recent reports seem to support the notion that whatever causes cancer may not be to do with your lifestyle or family history exclusively. Like you, I have no family history of any cancer, was healthy, had breastfed, had my breasts checked etc etc. That's why ALL women are encouraged to have mammograms regularly. Current stats I think are that 75% of women who get breast cancer are post menopausal. That seems a significant stat to me but we are still not clear on what it means. Herceptin is considered to be effective for HER2 positive cancer - it's usually a three weekly infusion for 12 months. I had no side effects from it at all. I did get an arrhythmia (irregular heart beat) during chemo. My newly acquired cardiologist did not think that my health or age made this at all likely, BUT that a combination of surgery (mastectomy), chemo (my side effects were limited but it still has an impact on your body) and age combined might be enough to tip the balance. I am fine and the condition is quite manageable but I have no actual heart disease (it's the electronic circuit of the heart that's gone a bit daffy). So that MIGHT be why your oncologist is being cautious.