I was diagnosed with stage 2 HER2+ earlier this year and just finished 6 rounds of TCHP chemo. Same as you, I was offered Perjeta and told it's not essential but works well alongside Herceptin for better results. Perjeta cost me $6000 but for me it was a no-brainer. I am only 30 years old and want to do everything in my power to stay alive. For me, it worked. I found out a couple days ago the cancer was completely eradicated and I had a complete response to chemo! If you have the option and the money, do the Perjeta. It saved my life and I hope it helps you as well x