I don’t believe my rare neuroendocrine lung cancer and breast cancer are related. I did not have any other treatment before my breast cancer. I also have the BRCA2 and CHEK2 mutations for breast cancer. I was told between the two I had an 80% chance of getting breast cancer. I do know radiation can cause other cancer in the future but I don’t think I’m there yet. Lots of different kinds of cancer in my family. I’m betting my family has a lot of unidentified genetic mutations.