Radiation with Old Implants

I am about to undergo radiation and am concerned about how this may affect my implant (approx 10 years old). I am aware that radiation can cause issues with the implant and had thought I could have a reconstruction down the track if needed, although I am now finding out that this can be tricky due to the damaged tissue. Does anyone have experience with this? I am also waiting on genetic testing which may push me down the mastectomy/reconstruction path instead (if positive) so I am wondering if this is going to be a better option.