If i'm recalling things correctly, HER2 means the cancer cells are more aggressive, and more likely to spread, but respond to treatment. Due to its aggressive nature, chemo is preferred as a systematic sweep up in case any rogue cell has escaped the local area. Just takes one to be missed, and this is where chemo comes in. About the injections, the drug you are given blocks signals telling the cells to grow. It's been 2 years since my wife has been out of treatment, and probably a further 6 months since i heard this from a doctor. So the details might be a little bit off.

About your percentages, only you can decide if those odds are worth the treatment. Doctors can advise, but it's your body. If the cancer were to reoccurrence, just make sure you wouldn't be left with any regrets. Some people do go without and have no issues, some do. But there again, it can happen with or without further treatment. 'tis all luck, and about stacking the odds further in your favour.

If i'm recalling things correctly, HER2 means the cancer cells are more aggressive, and more likely to spread, but respond to treatment. Due to its aggressive nature, chemo is preferred as a systematic sweep up in case any rogue cell has escaped the local area. Just takes one to be missed, and this is where chemo comes in. About the injections, the drug you are given blocks signals telling the cells to grow. It's been 2 years since my wife has been out of treatment, and probably a further 6 months since i heard this from a doctor. So the details might be a little bit off.

About your percentages, only you can decide if those odds are worth the treatment. Doctors can advise, but it's your body. If the cancer were to reoccurrence, just make sure you wouldn't be left with any regrets. Some people do go without and have no issues, some do. But there again, it can happen with or without further treatment. 'tis all luck, and about stacking the odds further in your favour.

Very wise words ProfBaw.  I was diagnosed with breast cancer 5 years ago and I had an operation to remove the tumour and also, the surgeon removed a couple of lymph nodes. I  was strongly advised to have radiation therapy afterwards to kill off any stray cancer cells, but I felt so exhausted after the operation and trying to recover from it that I didn't feel able to go through radiotherapy.  This was a mistake, because 16 months later the cancer came back.  I am now terminal.  Of course I am very much aware that even if I had gone down the radiation route, the cancer might still have come back, but I guess I will never know.  Of course if I could go back, I would have made a different decision, but I try not to dwell on the 'what ifs' and 'maybes' .........after all, it doesn't change anything does it?  I am now focused on living in the here and now.