darkside,
I had Her2+ too and the same chemo. AIso have the Brca2 mutation. I did not have spots on my liver, but i was given 18 doses of Herceptin/Perjeta infusions every 3 weeks for 1 year. Those are both used for metastatic, although mine was not. I was stage 2b, 3 nodes out that were clear. My tumor was big so that was another factor, and at City of Hope for my cancer this was chosen for long term effects. I was also given Lynparza for 1 year, a twice daily pill. I was 61 at the time and 64 now.
About Herceptin alone. a good friend of mind was put on that one alone for her stage 4. She credits it with her continued stability 3 years later. I had joint pain some. I have had nothing lasting and little if any side effects from the two. I am nearly 3 years from the removal of the cancer. At the time, I remember talking with the doctor and trusting that as part of my treatment plan the team of oncologists at COH felt this was a necessary part of my plan.