Luminal B Her2 positive HR positive 5mm-no chemotherapy?

Hi community,

I am 38 years old and recently underwent a conservative breast surgery where all tissue of an CDIS has been removed with sufficient security margins and 1/1 node negative.

However, a tiny piece of 5mm already turned into an invasive cancer. Classification pT1aN0M0, Luminal B Her2+, HR+, grade 3, node negative.

2 breast specialists won't go for any further chemotherapy treatment due to limited benefits over possible disadvantages.

Oncologist recommended 12 weeks of Paclitaxel following 1 year Trastuzumab. So far, I understood that treatment impacts only 5 % to total cure and he got very quiet about side effects. A lot of recent studies do not recommend chemotherapy anymore. I do not know what to do . My case seems to be a bit of a rare situation and no one knows really what to do.
 

Trastuzumab is not administered on it's own because it's not the standard therapy.

I felt super healthy after surgery and getting sick just now and even more by an aggressive treatment.

Where I can find further information?

What would you recommend or decide ans why?

Anyone in the same or has gone through a similar Situation and can help with own experiences?

Have a lovely day

Hamaca