I had invasive ductal carcinoma in one breast. Nine months after radiation treatment, I was diagnosed with invasive lobular carcinoma in my other breast. Quite frankly, it didn't matter to me that the cancers were different; rather, I just wanted to rid myself of my boobs as quickly as possible and I did. Post mastectomies, I did look into the scenario of two different cancers, but found nothing that shed any light on such a diagnosis. I never searched again and it's been three years. Let us know if you find any valuable data.