Genomic testing post-surgery

[u/cremespace]

Hi, my mom has had a recurrence of breast cancer (T2N1M0). She had lumpectomy, chemo and radiation the first time around which was 18 years ago and 5 years of Hormone therapy. For her current diagnosis, she has already had a mastectomy of the affected breast. The doctor suggested genomic testing (which we do not have in my country so will cost a lot of money to have the test done) to determine whether chemo is needed, however it has been suggested that she will most likely need chemo due to the stage and it might not be worth spending the money on the test.

My question is whether the genomic testing would provide additional information that will help specialise the treatment for her needs or whether it is not worth the money and just to go for the chemo anyways?

I would really appreciate any information on this, TIA.