Big question Goofy.
Statistically i have no idea.
You breast cancer.........i have no details of your treatment (can't believe it was just Tamoxifen) or it staging and so, i cannot give an opinion as to your prognosis.
Bowel cancer much the same, although you do mention an operation, but no idea of the type of cancer or stage.
Realistically?......doesn't look too good for you does it? Practically, in medicine, one should never say never and anything can happen.