My mom was diagnosed of breast cancer the day after I relocated to the US. I couldn't be with her when had her surgery, then later I visited and was doing all right. A few years later we were planing her trip to visit me and my newborn adopted son and 20 days before her flight she was disagnosed with bone cancer. She passed away ten days after. She was always following up with her oncologyst and he missed it.
I can only tell you that I wish I was there for her when she needed her daughter. My sister and brother were there but I know she cried for not seeing me. If it is in your power don't miss the opportunity because later there is nothing to do about it.
Also, make sure you get a mamography every year, I was diagnosed with breast cancer 2 year ago, had only a lumpoctomy and radiation and I've been cancer free. None of my sisters had it but some of us are not that lucky.
love