Sterotactic biopsy is where you lay face down on a table & your breast goes through a hole in the table. They clamp the breast under the table like during a mammogram & do a mammogram guided biopsy.
https://www.mayoclinic.org/tests-procedures/breast-biopsy/multimedia/stereotactic-breast-biopsy/img-20008883
Yes, it was the Oncologist who orders the Oncotype test. I would wait for all the results so you can make an informed decision for yourself once you have all the information. Meanwhile research extensively at reputable sites like Mayo & Cleveland clinic on whatever treatments the doctors are suggesting. Search the comments on here to see others experiences with treatments. Don’t let them pressure you into making a decision. Mine thought I was crazy for not getting radiation. It all depends on the degree of the DCIS, genetic test results that will be specific to you since they look at your biopsy or pathology sample to grade the test & also consider the margins of the pathology. I felt mine was a no brainer since there was no cancer present in my pathology report & my DCIS was an early stage. It wasn’t too long ago that doctors recommended a complete mastectomy for DCIS instead of lumpectomy’s. Only time will tell if I made the right decision but for my specific case.