Method of selection for treatment of subjects at risk of invasive breast cancer
The present disclosure provides compositions and methods for the treatment of subjects having a risk of invasive breast cancer. In some embodiments, these aspects allow for the pairing of the proper treatment option for the particular subject. In some embodiments, this allows for identifying subjects who, while at risk for invasive breast cancer, will not normally respond to radiation therapy, and can instead receive an alternative therapy, such as a HER2 antibody.
1. A method of identifying a subject for treating with a breast cancer therapy, the method comprising:
providing a DCIS sample from a subject with a primary DCIS, wherein the subject has an elevated risk of subsequent ipsilateral breast cancer recurrence;
analyzing the DCIS sample from the subject by measuring expression levels of HER2 and SIAH2;
identifying and selecting the subject for breast cancer therapy based on positive expression levels of both HER2 and SIAH2; and
administering to the selected subject:
(i) surgical removal of the primary DCIS; and
(ii) one or more of aggressive radiation therapy or a non-radiation therapy, to treat the subject for breast cancer, thereby reducing an elevated risk of subsequent ipsilateral breast cancer recurrence, wherein the DCIS sample is at least Ki67 positive.
2. The method of claim 1 , wherein the non-radiation therapy comprises an anti-HER2 antibody.
3. The method of claim 2 , wherein the antibody is Trastuzumab.
4. The method of claim 1 , wherein the DCIS sample is PR positive and has a very high expression level of FOXA1.
5. The method of claim 1 , wherein analyzing the DCIS sample further comprises measuring expression levels of p16 and COX2.
6. The method of claim 5 , wherein analysis of each marker is carried out in parallel with each other.
7. The method of claim 5 , wherein analysis of each marker is carried out at overlapping times.
8. The method of claim 1 , wherein the non-radiation therapy comprises chemotherapy.
9. The method of claim 1 , wherein the DCIS sample is at least: i) PR positive and FOXA1 positive; or ii) PR positive, FOXA1 negative, and Ki67 positive.
10. The method of claim 1 , wherein the subject with the primary DCIS is identified to have the elevated risk of subsequent ipsilateral breast cancer recurrence based on an analysis of one or more of the following markers in the DCIS sample from the subject: PR, FOXA1, COX2, and p16.
11. The method of claim 10 , comprising further analyzing the DCIS sample for one or more of the markers.
12. The method of claim 1 , comprising analyzing the DCIS sample for grade, necrosis, size, and/or margin status.
13. The method of claim 1 , wherein the administered breast cancer therapy is more aggressive than a standard of care therapy that reduces the risk of subsequent ipsilateral breast cancer recurrence by approximately half when administered without measuring expression levels of both HER2 and SIAH2.