Hello Lozang
DCIS seems to confuse all the medicos as there are so many differing opinions.
I am convinced that all the BreastScreen mammograms cause DCIS. In years gone by it was never even detected and did not go on to become 'breast cancer'. (Wait for the criticism to come from these comments).
If your treatment team recommends radiation then go for it but ask ask ask - don't go in blindly.
I have rejected Tamoxifen as when asking about the statistics and how they get the percentages it says it can be of minimal help for our age group or older. Statistics are apparently based on menopause, life expectancy etc etc.
Anyway, listen to your heart and follow what feels best for you.
Hugs Summer :-)