My Breast Cancer has recurred. How does this change my treatment choices, and are new targeted therapies using...

I'm sorry to hear that your breast cancer has recurred. Dealing with a recurrence can be very difficult and stressful. Let me provide some information based on clinical guidelines that may be helpful regarding treatment choices for recurrent breast cancer and the use of biomarkers.

According to the National Comprehensive Cancer Network (NCCN) Guidelines for Breast Cancer:

• Treatment options depend on the hormone receptor (ER/PR) and HER2 status of the recurrent cancer, prior therapies received, and the location/extent of the recurrence.

• For hormone receptor positive (ER/PR+) recurrences, hormone therapy such as aromatase inhibitors or fulvestrant is typically used, sometimes combined with a CDK4/6 inhibitor drug.

• For HER2+ recurrences, HER2 targeted therapies like trastuzumab, pertuzumab, T-DM1 are recommended, often combined with chemotherapy.

• Genomic tests like Oncotype DX or biomarker assays may be used to help guide decisions about adding chemotherapy.

• For triple negative (ER/PR/HER2-) recurrences, chemotherapy is the main treatment.

The NCCN states that several newer targeted therapies have been approved for later lines of treatment based on specific biomarkers like PIK3CA mutations, NTRK fusions, or BRCA mutations in certain patients.

It's important to have your cancer re-tested for biomarkers if possible, as these can change over time. Your oncologist can advise on the latest approved treatments matched to your tumor characteristics and stage. Clinical trials may also be an option to consider.

Overall, a recurrence often expands treatment choices, particularly with the increasing use of biomarker-driven therapies. I'd recommend having an open discussion with your oncologist about the most appropriate systemic therapy approach for your specific situation.